Physical Sciences and Mathematics Commons^™

Xanes In (Tmtsef)2re04: Polarization Dependence Of The Se K-Edge, Juana Acrivos

Faculty Publications, Chemistry

We have measured XANES (X-ray Absorption Near Edge Spectra) near the Re Li(i=l,II,III) edges in (TMTTF)2Re04 and (TMTSeF)2Re04 and the Se K edge in the latter compound. An important dependence of the XANES at the Se K edge on the polarization of the incident beam with respect to the crystal axes was observed, whose interpretation can give information on the symmetry of the unoccupied conduction band states. The positions of the Re L edges were compared with those in several .inorganic compounds containing Re in various oxidation states, and were found to be, within experimental error, the same as those …

Centers Of Polymer Research; Polymer Science In The South And West Of Japan, Otto Vogl, T. Kunitake, J. Kiji

Emeritus Faculty Author Gallery

No abstract provided.

Symposium On Functional Polymers, Kunming, Yunnan, People’S Republic Of China, Otto Vogl, K. Takemoto

Emeritus Faculty Author Gallery

No abstract provided.

Centers Of Polymer Research; Polymer Science In The South And West Of Japan, Otto Vogl, T. Kunitake, J. Kiji

Otto Vogl

No abstract provided.

Symposium On Functional Polymers, Kunming, Yunnan, People’S Republic Of China, Otto Vogl, K. Takemoto

Otto Vogl

No abstract provided.

Calculated Electrocapillary Curve For A Molten Salt, Jerry Goodisman, S Amokrane

Chemistry - All Scholarship

If bulk properties of simple molten salts may be reasonably well understood in terms of the primitive model, the situation with respect to surface properties is less satisfactory. It has been shown that a simple model for the distributions at the free surface of a molten salt can give surface tension and surface energy in reasonable accord with experiment, provided that a factor guaranteeing local electroneutrality is introduced. In this model, properties are given in terms of bulk-salt distribution functions, for which the primitive model is used. The present work extends this model to the electrocapillary curve, i.e., variation of …

Kinetic And Spectral Studies Of Cobalt (Ii) -4, 4’, 4’’, 4’’’ –Tetrasulfophthalocyanine With Sodium Cyanide In Aqueous Solution, Pablo J. Diaz Cruz

Masters Theses & Specialist Projects

Kinetic studies of the cobalt (II)-4, 4’, 4’’, 4’’’-tetrasulfophtalocyanine and cyanide system were performed under argon and in air over temperature ranges of 294-314°K and 294-324°K, respectively. Two reactions were detected under argon. One was quite rapid and was followed on the stopped-flow apparatus. The results are consistent with the perturbation of a monomer-dimer equilibrium. The second reaction was slow enough to be followed spectrophotometrically on the Cary Model 14 spectrophotometer. The second order rate constant of 0.11 M^-1 sec^-1 at 294°K has been attributed to the rate of substitution of the second cyanide addition to a dye-cyanide …

Oxidation Activity Of Catalyst 3-7a Toward Formaldehyde, Hydrogen Cyanide, And Some Alkane Gases, John Kawas

Masters Theses & Specialist Projects

The activity of Catalyst 3-7A toward the oxidation of formaldehyde, hydrogen cyanide, methane, propane, and isobutene was examined at temperatures between 25°C and 400°C. The catalyst consists of palladium(II) and copper (II) salts impregnated on an alumina support. The oxidation measurements were made primarily with gas chromatographs, although form aldehyde and hydrogen cyanide were also examined using the colorimetric fushsin method and Liebig titrations, respectively. Catalyst 3-7A demonstrated appreciable activity toward the oxidation of all gases studied except formaldehyde where there was no evidence of oxidation. The latter result is quite unexpected since aldehydes are more easily oxidized than alkanes. …

Kinetics Of Ternary Complex Formation Reactions Of The Nickel(Ii) Complexes Of Ethylenediaminediacetate And Triethylenetetramine With Bidentate Donors, Lawrence H. Kolopajlo

Dissertations

The stopped-flow technique was used to measure rate constants for ternary complex formation involving both NiEDDA and Ni(trien)('2+), and bidentate donors. The reactions of both NiEDDA and Ni(trien)('2+) with bipy, phen, en, and sar were studied. In addition the reaction of NiEDDA and gly was studied. The reactions were of the first-order with respect to either nickel complex, and with respect to enH('+), bipy, and phen. The reactions involving phen and bipy were independent of pH and were reversible. The formation rate constants for the systems containing diamine reactants are as follows:

(DIAGRAM, TABLE OR GRAPHIC OMITTED...PLEASE SEE DAI)

For …

Determination Of Organophosphorus Compounds By Hplc With Post-Column Photochemical Degradation Followed By The Formation Of Reduced Heieropolymolybdate, Stephen R. Priebe

Dissertations

A novel method for the determination of organophosphorus (OP) compounds by HPLC with post-column photochemical and chemical derivatization reactions has been developed. The OP compounds eluted from the column were photochemically degraded to orthophosphate by the use of a 450 W xenon lamp in conjunction with an auxiliary photodegradation reagent. The photodegradation reaction was studied extensively by means of batch irradiations with triethylphosphate as a model compound. The effects of the initial concentrations of triethylphosphate and ammonium peroxydisulfate, and of varying the pH of the reaction medium were determined. A survey of potential interferences was performed. Copper(II) ion was found …

Centers Of Polymer Research; Polymer Science In The Nagoya Area, Otto Vogl, M. Nagasawa, Y. Yamashita

Emeritus Faculty Author Gallery

No abstract provided.

U.S.-Swedish Workshop On Photodegradation And Photostabilization Of Polymers, Otto Vogl, Bengt Ranby

Emeritus Faculty Author Gallery

No abstract provided.

Centers Of Polymer Research; Polymer Science In The Nagoya Area, Otto Vogl, M. Nagasawa, Y. Yamashita

Otto Vogl

No abstract provided.

U.S.-Swedish Workshop On Photodegradation And Photostabilization Of Polymers, Otto Vogl, Bengt Ranby

Otto Vogl

No abstract provided.

Spermidine-Condensed Phi X174 Dna Cleavage By Micrococcal Nuclease: Torus Cleavage Model And Evidence For Unidirectional Circumferential Dna Wrapping., Kenneth A. Marx, Thomas C. Reynolds

Dartmouth Scholarship

Spermidine-condensed phi X174 replicative form (RF) II DNA was digested with micrococcal nuclease to yield seven identifiable DNA bands forming an arithmetic fragment-length series. The DNA monomer unit length was found to be 780 +/- 80 base pairs. This result is most consistent with a proposed model for micrococcal nuclease cleavage of a DNA torus organized by the unidirectional, circumferential wrapping of B-geometry DNA. By a topological consideration, the blunt-end-rod-fusion model for torus formation [Eickbush, T. H. & Moudrianakis, E. N. (1978) Cell 13, 295-306] is shown to be inconsistent with our empirical solution results. We propose a continuous, circumferential …

Centers Of Polymer Research; Polymer Science In Osaka, Japan: Part Ii, Otto Vogl, T. Otsu, K. Hatada

Emeritus Faculty Author Gallery

No abstract provided.

Excited States And Photochemistry Of Saturated Molecules. 11. Potential Energy Surfaces In Low-Lying States Of Ethane, James W. Caldwell, Mark S. Gordon

Mark S. Gordon

Ab initio calculations at both the restricted Hartree-Fock (RHF) and singly excited configuration interaction (SEC I) levels have been carried out on sections of the potential energy surfaces for a number of low-lying excited singlet electronic states of ethane. All vertical states below the first ionization potential are predominantly Rydberg in character, as are all minima detected on the potential energy surfaces. The lowest 1Eg state is predicted to have only a very small (""" 1 kcal/mol) barrier separating its minimum-energy structure from the 1A" ethylidene + 1 ~/ H2 products. Since the vertical Eg molecule has more than enough …

Centers Of Polymer Research; Polymer Science In Osaka, Japan: Part Ii, Otto Vogl, T. Otsu, K. Hatada

Otto Vogl

No abstract provided.

Self‐Consistent Molecular Orbital Methods. Xxiii. A Polarization‐Type Basis Set For Second‐Row Elements, Michelle M. Francl, William J. Pietro, Warren J. Hehre, J Stephen Binkley, Mark S. Gordon, Douglas J. Defrees, John A. Pople

Chemistry Faculty Research and Scholarship

The 6‐31G* and 6‐31G** basis sets previously introduced for first‐row atoms have been extended through the second‐row of the periodic table. Equilibrium geometries for one‐heavy‐atom hydrides calculated for the two‐basis sets and using Hartree–Fock wave functions are in good agreement both with each other and with the experimental data. HF/6‐31G* structures, obtained for two‐heavy‐atom hydrides and for a variety of hypervalent second‐row molecules, are also in excellent accord with experimental equilibrium geometries. No large deviations between calculated and experimental single bond lengths have been noted, in contrast to previous work on analogous first‐row compounds, where limiting Hartree–Fock distances were in …

Excluded-Volume Effect On Quasi-Elastic Light Scattering By Flexible Macromolecules, Genzo Tanaka, Walter H. Stockmayer

Dartmouth Scholarship

First-order perturbation expressions are developed for the first cumulant (initial time derivative) of the dynamic structure factor observable by photon-correlation measurements of the light scattered by flexible chain molecules in solution. A dimensionless coefficient C, which measures the initial departure of the first cumulant from proportionality to the square of the scattering vector, is found to be only slightly altered by excluded-volume effects.

Separation Of Piperylene Concentrate Via Metathesis Catalysis, Donald R. Allred

Retrospective Theses and Dissertations

Diolefin metathesis, using a Re2O7 catalyst, failed to show a reactivity difference due to conjugation of double bonds. However, the same system allows reaction of pentadiene while not affecting cyclopentene yielding a successful reaction ΓÇô separation scheme for a piperylene concentrate mixture.

Centers Of Polymer Research; Polymer Science In Osaka, Japan: Part I, Otto Vogl, T. Otsu, K. Hatada

Emeritus Faculty Author Gallery

No abstract provided.

Gas-Phase Photolysis Of 2,2-Dimethylbutane, 2,2,3-Trimethylbutane, 2,2,3-Trimethyl-2-Silabutane, And 2,2,3,3-Tetramethyl-2-Silabutane At 147 Nm, Daryl J. Doyle, S. K. Tokach, Mark S. Gordon, Robert D. Koob

Mark S. Gordon

The 147-nm photolyses of 2,2-dimethylbutane, 2,2,3-trimethylbutane, 2,2,3-trimethyl-2-silabutane (isopropyltrimethylsilane), and 2,2,3,3-tetramethyl-2-silabutane (tert-butyltrimethylsilane) are reported. In addition, the mercury-sensitized photolyses of i-C4H10, trimethylsilane, and mixtures of i-C4H10 and trimethylsilane are reported which give disproportionation to combination (D/C) ratios of 2.1 ::1::0.2 and 0.28::1::0.05 for (CH3) 3C + (CH3) 3C and (CH3)gSi + (CH3)gSi, respectively, and D/C ratios of 1.86::1:: 0.15 and 0.55 ::1:: 0.08 for (CH3)gC + (CH3)aSi to form 2-methyl-2-silapropene and i-C4H8, respectively. With the completion of this work, several trends and generalizations can be drawn concerning the importance of various processes in linear vs. branched alkanes and alkylsilanes. These conclusions …

Centers Of Polymer Research; Polymer Science In Osaka, Japan: Part I, Otto Vogl, T. Otsu, K. Hatada

Otto Vogl

No abstract provided.

Isolation And Characterization Of The Serum Ferroxidase Inhibitor, Melissa Page Calisch

Master's Theses

strong evidence suggests that the serum ferroxidases (ceruloplasmin andferroxidase II) promote the formation of Fe-III transferrin and thereby stimulate the turnover of iron from tissue stores. Ceruloplasmin is the major ferroxidase in human serum; whereas, ferroxidase II accotmts for an increased proportion of the activity in less highly developed animals. A large fold increase in total ferroxidase II activity was observed when both human and rabbit sera were subjected to gel-filtration on sephadex G-200. This indicated that whole serum might contain a potent inhibitor of ferroxidase II. Such an inhibitor has been isolated and purified to homogeneity by a combination …

Centers Of Polymer Research; Polymer Science In Tokyo, Japan, Part Iii: Suburban Area, Otto Vogl, I. Uematsu, A. Abe

Emeritus Faculty Author Gallery

No abstract provided.

Effects Of Polar Substituents On Carbon-Silicon Multiple Bonds, Mark S. Gordon

Mark S. Gordon

The results of ab initio calculations on the effects of fluorine and lithium substitution on silaethyne and silaethylene and their isomers are presented. It is found that fluorine has a strong stabilizing effect when attached to silicon. This results in the predictions (a) that a distorted 1-fluoro-1-silaethyne is the most stable structure of HCSiF and (b) that 1,1-difluoro- 1-silaethylene is much lower in energy than 1,2-difluoromethylsilylene. Approximate correlation corrections are added to study the HC~iF - FHC=Si and HC==SiLi - LiHC=Si potential energy surfaces.

Centers Of Polymer Research; Polymer Science In Tokyo, Japan, Part Iii: Suburban Area, Otto Vogl, I. Uematsu, A. Abe

Otto Vogl

No abstract provided.

24th Rocky Mountain Conference

Rocky Mountain Conference on Magnetic Resonance

Abstracts and meeting program from the 24th annual meeting of the Rocky Mountain Conference, co-sponsored by the Rocky Mountain Section of the Society for Applied Spectroscopy and the Rocky Mountain Chromatography Discussion Group. Held in Denver, Colorado, August 1-5, 1982.

Micellarly Catalyzed Reaction Of Substituted Benzohydroxamic Acids, Nop Utrapiromsuk

Dissertations

The rate constants for hydrolysis of ten derivatives of benzohydroxamic acid, namely, p-H, p-CH(,3), m-CH(,3), p-CH(,3)CH(,2), p-OCH(,3), p-NO(,2), p-Cl, and m-Cl, in 0.160 and 0.158 M HCl at 67.9-68.2(DEGREES)C without and with sodium 1-dodecanesulfonate were determined. There is a good linear correlation between log k(,w) and the Hammett substituent constants, (sigma), for all para and meta derivatives where k(,w) is the rate constant in the bulk aqeous phase. In the presence of micelles all the compounds, except the meta-nitro derivative, followed the standard pseudophase model of micellar catalysis. However, correlations of log k(,m) or log K/N, where k(,m) is the …