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Articles 1 - 30 of 40
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A Control Switch For Prothrombinase: Characterization Of A Hirudin-Like Pentapeptide From The Cooh Terminus Of Factor Va Heavy Chain That Regulates The Rate And Pathway For Prothrombin Activation, Michael A. Bukys, Paul Y. Kim, Michael E. Nesheim, Michael Kalafatis
A Control Switch For Prothrombinase: Characterization Of A Hirudin-Like Pentapeptide From The Cooh Terminus Of Factor Va Heavy Chain That Regulates The Rate And Pathway For Prothrombin Activation, Michael A. Bukys, Paul Y. Kim, Michael E. Nesheim, Michael Kalafatis
Chemistry Faculty Publications
Membrane-bound factor Xa alone catalyzes prothrombin activation following initial cleavage at Arg(271) and prethrombin 2 formation (pre2 pathway). Factor Va directs prothrombin activation by factor Xa through the meizothrombin pathway, characterized by initial cleavage at Arg(320) (meizo pathway). We have shown previously that a pentapeptide encompassing amino acid sequence 695-699 from the COOH terminus of the heavy chain of factor Va (Asp-Tyr-Asp-Tyr-Gln, DYDYQ) inhibits prothrombin activation by prothrombinase in a competitive manner with respect to substrate. To understand the mechanism of inhibition of thrombin formation by DYDYQ, we have studied prothrombin activation by gel electrophoresis. Titration of plasma-derived prothrombin activation …
Biomass Burning And Anthropogenic Sources Of Co Over New England In The Summer 2004, Carsten Warneke, J. A. De Gouw, A. Stohl, O. R. Cooper, P. D. Goldan, W. C. Kuster, J. S. Holloway, E. J. Williams, B. M. Lerner, S. A. Mckeen, M. Trainer, F. C. Fehsenfeld, E. L. Atlas, Stephen G. Donnelly Ph.D., Verity Stroud, Amy Lueb, S. Kato
Biomass Burning And Anthropogenic Sources Of Co Over New England In The Summer 2004, Carsten Warneke, J. A. De Gouw, A. Stohl, O. R. Cooper, P. D. Goldan, W. C. Kuster, J. S. Holloway, E. J. Williams, B. M. Lerner, S. A. Mckeen, M. Trainer, F. C. Fehsenfeld, E. L. Atlas, Stephen G. Donnelly Ph.D., Verity Stroud, Amy Lueb, S. Kato
Chemistry Faculty Publications
During the summer of 2004 large wildfires were burning in Alaska and Canada, and part of the emissions were transported toward the northeast United States, where they were measured during the NEAQS-ITCT 2k4 (New England Air Quality Study-Intercontinental Transport and Chemical Transformation) study on board the NOAA WP-3 aircraft and the NOAA research vessel Ronald H. Brown. Using acetonitrile and chloroform as tracers the biomass burning and the anthropogenic fraction of the carbon monoxide (CO) enhancement are determined. As much as 30% of the measured enhancement is attributed to the forest fires in Alaska and Canada transported into the region, …
Generating New Specific Rna Interaction Interfaces Using C-Loops, Kirill A. Afonin, Neocles B. Leontis
Generating New Specific Rna Interaction Interfaces Using C-Loops, Kirill A. Afonin, Neocles B. Leontis
Chemistry Faculty Publications
New RNA interaction interfaces are reported for designing RNA modules for directional supramolecular self-assembly. The new interfaces are generated from existing ones by inserting C-loops between the interaction motifs that mediate supramolecular assembly. C-Loops are new modular motifs recently identified in crystal structures that increase the helical twist of RNA helices in which they are inserted and thus reduce the distance between pairs of loop or loop-receptor motifs from 11 to 9 base-stacking layers while maintaining correct orientation for binding to cognate interaction interfaces. Binding specificities of C-loop-containing molecules for cognate molecules that also have inserted C-loops were found to …
Incorporating Electron-Transfer Functionality Into Synthetic Metalloproteins From The Bottom-Up, Jing Hong, Olesya A. Kharenko, Michael Y. Ogawa
Incorporating Electron-Transfer Functionality Into Synthetic Metalloproteins From The Bottom-Up, Jing Hong, Olesya A. Kharenko, Michael Y. Ogawa
Chemistry Faculty Publications
The alpha-helical coiled-coil motif serves as a robust scaffold for incorporating electron-transfer (ET) functionality into synthetic metalloproteins. These structures consist of a supercoiling of two or more R helices that are formed by the self-assembly of individual polypeptide chains whose sequences contain a repeating pattern of hydrophobic and hydrophilic residues. Early work from our group attached abiotic Ru-based redox sites to the most surface-exposed positions of two stranded coiled-coils and used electron-pulse radiolysis to study both intra- and intermolecular ET reactions in these systems. Later work used smaller metallopeptides to investigate the effects of conformational gating within electrostatic peptide-protein complexes. …
True Blue: Blue-Emitting Aluminum(Iii) Quinolinolate Complexes, Cesar Perez-Bolivar, Victor A. Montes, Pavel Anzenbacher Jr.
True Blue: Blue-Emitting Aluminum(Iii) Quinolinolate Complexes, Cesar Perez-Bolivar, Victor A. Montes, Pavel Anzenbacher Jr.
Chemistry Faculty Publications
Blue-emitting heteroleptic aluminum(III) bis(2-methyl-8-quinolinolate) phenolate complexes were synthesized. A tunable, blue-to-green emission is achieved by attaching electron-withdrawing modulators to the emisssive quinaldinate ligand. The electronic nature of modulator substituents attached to the position of the highest HOMO (highest occupied molecular orbital) density is used to modulate ligand HOMO levels to achieve effective emission tuning to obtain blue-emitting materials. Optical and electrochemical properties of the resulting complexes were investigated and compared to the results of density functional theory (DFT/B3LYP/6-31G*) studies. The resulting materials may find application as organic light-emitting device materials.
Nano-Chemistry, Erwin P. Enriquez
Nano-Chemistry, Erwin P. Enriquez
Chemistry Faculty Publications
Nanotechnology is a highly interdisciplinary field, with contributions from all fields: physics, chemistry, biology, materials science, engineering, and others. The explosive number of publications in this field makes it nearly impossible to give an extensive review even in chemistry alone. Nonetheless, one may track its emergence and rapid advancement from the point of view of a chemist's. This paper aims to provide a conceptual overview of chemistry for nanotechnology, a brief classification of different approaches and applications, together with some sample cases.
A 2:1 Complex Of 1,3-Bis(9h-Carbazol-9-Yl)Propane And TetraChloro-P-Benzoquinone (P-Chloranil), Mustafa Arslan, Randolph B. Krafcik, John Masnovi, Ronald J. Baker
A 2:1 Complex Of 1,3-Bis(9h-Carbazol-9-Yl)Propane And TetraChloro-P-Benzoquinone (P-Chloranil), Mustafa Arslan, Randolph B. Krafcik, John Masnovi, Ronald J. Baker
Chemistry Faculty Publications
In the title electron donor–acceptor complex, C27H22N2·0.5C6Cl4O2, the p-chloranil molecule lies on a crystallographic inversion center, which is located at the center of the benzene ring. In the crystal structure, one p-chloranil molecule lies above and below the central rings of each donor group of two neighboring 1,3-bis(9H-carbazol-9-yl)propane molecules, with a ring-centroid separation of 3.444 (1) Å. The angle between the planes of the stacking rings of the carbazole and p-chloranil molecules is 3.4 (2)°.
(E,E)-1,3-Bis[9,10-Dihydro-9-Nitro-10-(TrinitroMethYl)-9-AnthrYl]Propane, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
(E,E)-1,3-Bis[9,10-Dihydro-9-Nitro-10-(TrinitroMethYl)-9-AnthrYl]Propane, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
Chemistry Faculty Publications
The title compound, C33H24N8O16, was obtained as a product of the photoreaction between 1,3-di-9-anthrylpropane and tetranitromethane. The molecule occupies a special position on a twofold axis. The trinitromethyl and nitro substituents on the 9,10-dihydroacridine system are E oriented.
Tertiary Structural And Functional Analyses Of A Viroid Rna Motif By Isostericity Matrix And Mutagenesis Reveal Its Essential Role In Replication, Neocles B. Leontis, Xuehua Zhong, Shuiming Qian, Asuka Itaya, Yijun Qi, Kathleen Boris-Lawrie, Biao Ding
Tertiary Structural And Functional Analyses Of A Viroid Rna Motif By Isostericity Matrix And Mutagenesis Reveal Its Essential Role In Replication, Neocles B. Leontis, Xuehua Zhong, Shuiming Qian, Asuka Itaya, Yijun Qi, Kathleen Boris-Lawrie, Biao Ding
Chemistry Faculty Publications
RNA-templated RNA replication is essential for viral or viroid infection, as well as for regulation of cellular gene expression. Specific RNA motifs likely regulate various aspects of this replication. Viroids of the Pospiviroidae family, as represented by the Potato spindle tuber viroid (PSTVd), replicate in the nucleus by utilizing DNA-dependent RNA polymerase II. We investigated the role of the loop E (sarcin/ricin) motif of the PSTVd genomic RNA in replication. A tertiary-structural model of this motif, inferred by comparative sequence analysis and comparison with nuclear magnetic resonance and X-ray crystal structures of loop E motifs in other RNAs, is presented …
Molecular-Wire Behavior Of Oled Materials: Exciton Dynamics In Multichromophoric Alq(3)-Oligofluorene-Pt(Ii) Porphyrin Triads, Victor A. Montes, Cesar Perez-Bolıvar, Neeraj Agarwal, Joseph Shinar, Pavel Anzenbacher Jr.
Molecular-Wire Behavior Of Oled Materials: Exciton Dynamics In Multichromophoric Alq(3)-Oligofluorene-Pt(Ii) Porphyrin Triads, Victor A. Montes, Cesar Perez-Bolıvar, Neeraj Agarwal, Joseph Shinar, Pavel Anzenbacher Jr.
Chemistry Faculty Publications
Donor-bridge-acceptor triads consisting of the Alq3 complex, oligofluorene bridge, and PtII tetraphenylporphyrin (PtTPP) were synthesized. The triads were designed to study the energy level/distance-dependence in energy transfer both in a solution and in solid state. The materials show effective singlet transfer from the Alq3-fluorene fluorophore to the porphyrin, while the triplet energy transfer, owing to the shorter delocalization of triplet excitons, appears to take place via a triplet energy cascade. Using femtosecond transient spectroscopy, the rate of the singlet−singlet energy transfer was determined. The exponential dependence of the donor−acceptor distance and the respective energy transfer rates of 7.1 × 1010 …
Synthesis, Structure, Anion Binding, And Sensing By Calix[4] Pyrrole Isomers, Ryuhei Nishiyabu, Manuel A. Palacios, Wim Dehaen, Pavel Anzenbacher Jr.
Synthesis, Structure, Anion Binding, And Sensing By Calix[4] Pyrrole Isomers, Ryuhei Nishiyabu, Manuel A. Palacios, Wim Dehaen, Pavel Anzenbacher Jr.
Chemistry Faculty Publications
The synthesis, structure, and anion binding properties of chromogenic octamethylcalix[4] pyrroles (OMCPs) and their N-confused octamethylcalix[4] pyrrole isomers (NC-OMCPs) containing an inverted pyrrole ring connected via alpha'- and beta-positions are described. X-ray diffraction analyses proved the structures of two synthesized isomeric pairs of OMCPs and NC-OMCPs. The addition of anions to solutions of chromogenic OMCPs and NC-OMCPs resulted in different colors suggesting different anion-binding behaviors. The chromogenic NC-OMCPs showed significantly stronger anion-induced color changes compared to the corresponding chromogenic OMCP, and the absorption spectroscopy titrations indicated that chromogenic OMCPs and NC-OMCPs also possess different anion binding selectivity. Detailed NMR studies …
Rnase L: Its Biological Roles And Regulation, Shu Ling Liang, David Quirk, Aimin Zhou
Rnase L: Its Biological Roles And Regulation, Shu Ling Liang, David Quirk, Aimin Zhou
Chemistry Faculty Publications
2'-5'oligoadenylate-dependent ribonuclease L (RNase L) is one of the key enzymes involved in the function of interferons (IFNs), a family of cytokines participating in innate immunity against viruses and other microbial pathogens. Upon binding with its activator, 5'-phosphorylated, 2'-5' linked oligoadenylates (2-5A), RNase L degrades single-stranded viral and cellular RNAs and thus plays an important role in the antiviral and antiproliferative functions of IFNs. In recent years, evidence has revealed that RNase L displays a broad range of biological roles which are summarized in this review.
10,10′-Dinitro-10,10′-(Butane-1,4-DiYl)Dianthracen-9(10h)-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
10,10′-Dinitro-10,10′-(Butane-1,4-DiYl)Dianthracen-9(10h)-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
Chemistry Faculty Publications
The title compound, C32H24N2O6, was obtained as the decomposition product of (E,E)-1,4-bis[9,10-dihydro-9-nitro-10-(trinitromethyl)-9-anthryl]butane, which was synthesized via a photochemical reaction of 1,4-bis(9-anthryl)butane with tetranitromethane. The asymmetric unit contains one half-molecule; the complete molecule is generated by a center of inversion. The crystal packing is determined mainly by intermolecular C—H⋯O interactions.
The Structural Integrity Of Anion Binding Exosite I Of Thrombin Is Required And Sufficient For Timely Cleavage And Activation Of Factor V And Factor Viii, Michael A. Bukys, Tivadar Orban, Paul Y. Kim, Daniel O. Beck, Michael E. Nesheim, Michael Kalafatis
The Structural Integrity Of Anion Binding Exosite I Of Thrombin Is Required And Sufficient For Timely Cleavage And Activation Of Factor V And Factor Viii, Michael A. Bukys, Tivadar Orban, Paul Y. Kim, Daniel O. Beck, Michael E. Nesheim, Michael Kalafatis
Chemistry Faculty Publications
Alpha-thrombin has two separate electropositive binding exosites (anion binding exosite I, ABE-I and anion binding exosite II, ABE-II) that are involved in substrate tethering necessary for efficient catalysis. Alpha-thrombin catalyzes the activation of factor V and factor VIII following discrete proteolytic cleavages. Requirement for both anion binding exosites of the enzyme has been suggested for the activation of both procofactors by alpha-thrombin. We have used plasma-derived alpha-thrombin, beta-thrombin (a thrombin molecule that has only ABE-II available), and a recombinant prothrombin molecule rMZ-II (R155A/R284A/R271A) that can only be cleaved at Arg(320) (resulting in an enzymatically active molecule that has only ABE-I …
Crown Ether-Metal ‘Sandwiches’ As Linking Mechanisms In Assembled Nanoparticle Films, Rebecca R. Pompano, Phillip G. Wortley, Leslie M. Moatz, D. J. Tognarelli, Kevin W. Kittredge, Michael C. Leopold
Crown Ether-Metal ‘Sandwiches’ As Linking Mechanisms In Assembled Nanoparticle Films, Rebecca R. Pompano, Phillip G. Wortley, Leslie M. Moatz, D. J. Tognarelli, Kevin W. Kittredge, Michael C. Leopold
Chemistry Faculty Publications
Crown ether ligands attached to monolayer-protected clusters (MPCs) were assembled as films and the linking mechanism between the crown ether–metal ion–crown ether bridges between nanoparticles was examined. Thicker films exhibited a red shift in the absorbance maximum for the surface plasmon band which was attributed to the increasing aggregation and cross linking within the film. Quantized double layer charging peaks suggest that film growth is selective toward a specific core size or exchange rate, either of which affect the number of potential linking ligands in the periphery of the MPCs. Multi-layer growth of films was only achieved with metal ions …
Numerical Simulation And Graphical Analysis Of In Vitro Benign Tumor Growth: Application Of Single-Particle State Bosonic Matter Equation With Length Scaling, Pradip K. Biswas, Jiansen Niu, Tobias Frederico, Valentin Gogonea
Numerical Simulation And Graphical Analysis Of In Vitro Benign Tumor Growth: Application Of Single-Particle State Bosonic Matter Equation With Length Scaling, Pradip K. Biswas, Jiansen Niu, Tobias Frederico, Valentin Gogonea
Chemistry Faculty Publications
We describe the application of a non-linear single-particle state bosonic condensate equation to simulate multicellular tumor growth by treating it as a coupling of two classical wave equations with real components. With one component representing the amplitude of the cells in their volume growth phase and the other representing the amplitude of the cells in their proliferation or mitosis phase, the two components of the coupled equation feed each other during the time evolution and are coupled together through diffusion and other linear and non-linear terms. The features of quiescent and necrotic cells, which result from poor nutrient diffusion into …
(Review) Green Fluorescent Proteins, Marc Zimmer
(Review) Green Fluorescent Proteins, Marc Zimmer
Chemistry Faculty Publications
Reviews the book:Green Fluorescent Protein: Properties, Applications, and Protocols. Second Edition. Methods of Biochemical Analysis, Volume 47. Edited by Martin Chalfie and Steven R Kain.Green Fluorescent Protein: Properties, Applications, and Protocols. Second Edition. Methods of Biochemical Analysis, Volume 47. Edited by Martin Chalfie and Steven R Kain. Hoboken (New Jersey): Wiley-Interscience. $89.95. xv + 443 p + 24 pl; ill.; index. ISBN: 0–471–73682–1. 2006.
Volatile Organic Compounds Composition Of Merged And Aged Forest Fire Plumes From Alaska And Western Canada, Joost A. De Gouw, C. Warneke, A. Stohl, A. G. Wollny, C. A. Brock, O. R. Cooper, J. S. Holloway, M. Trainer, F. C. Fehsenfeld, E. L. Atlas, Stephen G. Donnelly Ph.D., V. Stroud, A. Lueb
Volatile Organic Compounds Composition Of Merged And Aged Forest Fire Plumes From Alaska And Western Canada, Joost A. De Gouw, C. Warneke, A. Stohl, A. G. Wollny, C. A. Brock, O. R. Cooper, J. S. Holloway, M. Trainer, F. C. Fehsenfeld, E. L. Atlas, Stephen G. Donnelly Ph.D., V. Stroud, A. Lueb
Chemistry Faculty Publications
The NOAA WP-3 aircraft intercepted aged forest fire plumes from Alaska and western Canada during several flights of the NEAQS-ITCT 2k4 mission in 2004. Measurements of acetonitrile (CH3CN) indicated that the air masses had been influenced by biomass burning. The locations of the plume intercepts were well described using emissions estimates and calculations with the transport model FLEXPART. The best description of the data was generally obtained when FLEXPART injected the forest fire emissions to high altitudes in the model. The observed plumes were generally drier than the surrounding air masses at the same altitude, suggesting that the fire plumes …
10,10′-Dinitro-10,10′-(Propane-1,3-DiYl)Di-10h-Anthracen-9-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
10,10′-Dinitro-10,10′-(Propane-1,3-DiYl)Di-10h-Anthracen-9-One, Mustafa Arslan, Erol Asker, John Masnovi, Ronald J. Baker
Chemistry Faculty Publications
The title compound, C31H22N2O6, was obtained as the decomposition product of (E,E)-1,3-bis[9,10-dihydro-9-nitro-10-(trinitromethyl)-9-anthryl]propane, which was synthesized via a photochemical reaction of 1,3-di-9-anthrylpropane with tetranitromethane. Intermolecular C—H⋯O interactions are the most prominent features of the crystal packing; no indications of any intermolecular π–π stacking were found.
Platinum(Ii) Diimine Diacetylides: Metallacyclization Enhances Photophysical Properties, Fei Hua, Solen Kinayyigit, John R. Cable, Felix N. Castellano
Platinum(Ii) Diimine Diacetylides: Metallacyclization Enhances Photophysical Properties, Fei Hua, Solen Kinayyigit, John R. Cable, Felix N. Castellano
Chemistry Faculty Publications
The synthesis, structural characterization, and photoluminescence properties of a new platinum(II) diimine complex bearing the bidentate diacetylide ligand tolan- 2,2'-diacetylide (tda), Pt(dbbpy)( tda) [dbbpy) = 4,4'-di-tert-butyl-2,2'-bipyridine], are described. In CH2Cl2, Pt( dbbpy)( tda) exhibits a strong visible charge-transfer absorption and broad emission centered at 562 nm. The photoluminescence quantum yield and excited-state lifetime are 0.52 and 2.56 mu s, respectively, at room temperature. These parameters indicate that the planarization and rigidity introduced by the cyclic diacetylide leads to a lower-energy-absorbing species displaying enhanced photophysics relative to the analogous Pt( dbbpy)( C = CPh)(2). Time-dependent density functional theory calculations, which include …
Secondary N-Nitrosocarbamate Anions: Structure And Alkylation Reactions. A Dft Study, Vladimir Benin
Secondary N-Nitrosocarbamate Anions: Structure And Alkylation Reactions. A Dft Study, Vladimir Benin
Chemistry Faculty Publications
The current article reports theoretical studies (DFT: B3LYP/6-31+G(d)) on the structure and alkylation reactions of the anions of some secondary N-nitrosocarbamates, a class of ambident nucleophiles whose chemistry has been little explored. Several anions (1–4), with an increasing size of the carbamate alkyl (aryl) group were investigated, in an attempt to establish the influence of the size of that group on the thermal stability and regioselectivity of alkylation of the title anions. The conclusion is that thermal stability and the mode of reaction are affected significantly only in the presence of very large and branched carbamate groups. The thermal …
Nocturnal Odd-Oxygen Budget And Its Implications For Ozone Loss In The Lower Troposphere, Steven S. Brown, J. A. Neuman, T. B. Ryerson, M. Trainer, W. P. Dubé, J. S. Holloway, C. Warneke, J. A. De Gouw, Stephen G. Donnelly Ph.D., E. Atlas, B. Matthew, A. M. Middlebrook, R. Peltier, R. J. Weber, A. Stohl, J. F. Meagher, F. C. Fehsenfeld, A. R. Ravishankara
Nocturnal Odd-Oxygen Budget And Its Implications For Ozone Loss In The Lower Troposphere, Steven S. Brown, J. A. Neuman, T. B. Ryerson, M. Trainer, W. P. Dubé, J. S. Holloway, C. Warneke, J. A. De Gouw, Stephen G. Donnelly Ph.D., E. Atlas, B. Matthew, A. M. Middlebrook, R. Peltier, R. J. Weber, A. Stohl, J. F. Meagher, F. C. Fehsenfeld, A. R. Ravishankara
Chemistry Faculty Publications
Nitrogen oxides are important to the regulation of ozone throughout the Earth's atmosphere. Of particular interest for regional air quality is photochemical production and nocturnal destruction Of O3 in the lower troposphere in high NOx(=NO + NO2) environments. Nocturnal tropospheric odd oxygen (Ox), defined as O3 + NO2 + 2NO3 + 3N2O5, is used to assess the impact of NOx emissions on nocturnal O3 loss. Recent aircraft measurements of the components of Ox and HNO3 yield a detailed accounting of the nocturnal Ox budget in a regionally polluted environment. The analysis demonstrates the role of NO3 and N2O5 reactions in …
9-Ethyl-3-(9h-9-EthylCarbazol-3-Yl)-4-Nitro-9h-Carbazole, Erol Asker, John Masnovi
9-Ethyl-3-(9h-9-EthylCarbazol-3-Yl)-4-Nitro-9h-Carbazole, Erol Asker, John Masnovi
Chemistry Faculty Publications
In the molecule of the title compound, C28H23N3O2, the nitro group is almost perpendicular to the carbazole ring to which it is attached. The crystal packing is determined by C—H⋯O and π–π interactions, where the nitrated carbazole ring of one molecule associates in a shifted parallel planar orientation with the centrosymmetrically related non-nitrated carbazole ring of a neighbouring molecule.
Bis(9-EthylCarbazol-3-Yl)Ethane, Erol Asker, John Masnovi
Bis(9-EthylCarbazol-3-Yl)Ethane, Erol Asker, John Masnovi
Chemistry Faculty Publications
In the title compound, C30H28N2, each carbazole skeleton is essentially planar. The planes of the two carbazole ring systems are nearly parallel, with a dihedral angle of 2.33 (19)°. The crystal packing is stabilized only by van der Waals forces and weak C—H⋯π interactions.
Composition Ot Glvceride Esters Of Lauric Acid Bv Ftir Band Shape Analysis, Deniz P. Wong, Modesto Tan Chua, Erwin P. Enriquez
Composition Ot Glvceride Esters Of Lauric Acid Bv Ftir Band Shape Analysis, Deniz P. Wong, Modesto Tan Chua, Erwin P. Enriquez
Chemistry Faculty Publications
Synthesis of glyceride esters of a fatty acid produces a mixture of isomers that are difficult to separate and analyze, requiring high temperature GC in most cases particularly for long-chain esters. In this paper, we present a fast estimation of the composition of the glyceride esters of lauric acid and glycerol (monolaurin, dilaurin, and trilaurin) by FTIR band shape analysis. The method uses the fact that the carbonyl stretching regions of the pure glycerides have differentband shapes, which implies any composite band of a mixture of glycerides may be resolved into the component peaks due to each glyceride. The carbonyl …
9,9′-Diethyl-3,3′-Di-9h-CarbazolYl, Erol Asker, John Masnovi
9,9′-Diethyl-3,3′-Di-9h-CarbazolYl, Erol Asker, John Masnovi
Chemistry Faculty Publications
In the title compound, C28H24N2, the carbazole ring systems are essentially planar to within 0.076 (3) Å. The dihedral angle between the planes of the ring systems is 40.38 (4)°. The contribution of intermolecular π–π interactions to the molecular stacking is observed.
Bis(9-EthylCarbazol-3-Yl)Methane, Erol Asker, John Masnovi
Bis(9-EthylCarbazol-3-Yl)Methane, Erol Asker, John Masnovi
Chemistry Faculty Publications
In the title compound, C29H26N2, the carbazole ring systems are essentially planar. There is no indication of π–π interactions in the crystal structure, adjacent carbazole groups being non-parallel.
Orientational Disorder In Sodium Cadmium Trifluoride Trihydrate, Nacdf3·3h2o, Robert W. Smith, Arthur Mar, Jianjun Liu, Stan Schnell, John R. Hardy
Orientational Disorder In Sodium Cadmium Trifluoride Trihydrate, Nacdf3·3h2o, Robert W. Smith, Arthur Mar, Jianjun Liu, Stan Schnell, John R. Hardy
Chemistry Faculty Publications
Attempts to synthesize the hypothetical anhydrous fluoroperovskite NaCdF3, which has been predicted to be stable, resulted instead in a hydrated fluoride of nominal composition NaCdF3·3H2O. It decomposes to sodium fluoride, cadmium fluoride, and water at 60 °C. Its structure has been determined by single-crystal X-ray diffraction. Na0.92(2)Cd1.08F3.08·2.92H2O crystallizes in the cubic space group with a = 8.2369(4) Å and Z = 4. The structure is based on the NaSbF6-type (an ordered variant of the ReO3-type) and features tilted sodium- and cadmium-centred octahedra …
1,3-Indane-Based Chromogenic Calixpyrroles With Push-Pull Chromophores: Synthesis And Anion Sensing, Ryuhei Nishiyabu, Pavel Anzenbacher Jr.
1,3-Indane-Based Chromogenic Calixpyrroles With Push-Pull Chromophores: Synthesis And Anion Sensing, Ryuhei Nishiyabu, Pavel Anzenbacher Jr.
Chemistry Faculty Publications
Knoevenagel condensation of 2-formyl-octamethylcalix[4]pyrrole with selected 1,3-indanedione derivatives yields calix[4]pyrrole anion sensors with push-pull chromophores displaying strong intramolecular charge transfer. The push-pull feature results in augmented signal output as well as in dramatic changes in anion selectivity exemplified by a 50-fold increase in acetate vs chloride selectivity compared to the parent calix[4]pyrrole.
Annealing Effects On The Crystallite Size And Dielectric Properties Of Ultrafine Ba1-Xsrxtio3 (0 < X < 1) Powders Synthesized Through An Oxalate-Complex Precursor, Gabriel Caruntu, Charles J. O'Connor
Annealing Effects On The Crystallite Size And Dielectric Properties Of Ultrafine Ba1-Xsrxtio3 (0 < X < 1) Powders Synthesized Through An Oxalate-Complex Precursor, Gabriel Caruntu, Charles J. O'Connor
Chemistry Faculty Publications
Nanocrystalline Ba12xSrxTiO3 (0 , x , 1) nanopowders were prepared through the oxalate route and the influence of the thermal history on their dielectric properties was investigated. For pelletized samples obtained by decomposing the corresponding oxalate intermediates at 600 uC and then annealed at different temperatures ranging from 600 to 1000 uC the dielectric constant decreases upon increasing the strontium content of the samples. Similar behavior was observed with decreasing the temperature of the thermal treatment of the pellets, a trend which is presumably ascribed to a synergic effect of decreasing the porosity of the samples, the increase of the …