Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
A Comparison Of Gc-Fid And Ptr-Ms Toluene Measurements In Ambient Air Under Conditions Of Enhanced Monoterpene Loading, Jesse L. Ambrose, K. Haase, R. S. Russo, Y. Zhou, M. L. White, E. K. Frinak, C. Jordan, Howard R. Mayne, Robert W. Talbot, B. C. Sive
A Comparison Of Gc-Fid And Ptr-Ms Toluene Measurements In Ambient Air Under Conditions Of Enhanced Monoterpene Loading, Jesse L. Ambrose, K. Haase, R. S. Russo, Y. Zhou, M. L. White, E. K. Frinak, C. Jordan, Howard R. Mayne, Robert W. Talbot, B. C. Sive
Chemistry
Toluene was measured using both a gas chromatographic system (GC), with a flame ionization detector (FID), and a proton transfer reaction-mass spectrometer (PTR-MS) at the AIRMAP atmospheric monitoring station Thompson Farm (THF) in rural Durham, NH during the summer of 2004. Simultaneous measurements of monoterpenes, including alpha- and beta-pinene, camphene, Delta(3)-carene, and d-limonene, by GC-FID demonstrated large enhancements in monoterpene mixing ratios relative to toluene, with median and maximum enhancement ratios of similar to 2 and similar to 30, respectively. A detailed comparison between the GC-FID and PTR-MS toluene measurements was conducted to test the specificity of PTR-MS for atmospheric …
2-(9-AnthrylmethylIdeneAmino)-4-MethylPhenol, Ralph Isovitsch
2-(9-AnthrylmethylIdeneAmino)-4-MethylPhenol, Ralph Isovitsch
Chemistry
The title compound, C22H17NO, is a novel Schiff base synthesized via a condensation reaction between 9-anthracenecarboxaldehyde and 2-amino-p-cresol. The asymmetric unit contains two independent molecules that are joined by an O—H⋯OH hydrogen bond. An intramolecular O—H⋯N hydrogen bond occurs in each molecule. π-stacking about inversion centers was observed between adjacent phenol rings [centroid–centroid distance = 3.850 (2) Å] and adjacent anthracene rings [centroid–centroid distance = 3.834 (2) Å]. The C—N=C—C torsion angles between the phenol and anthracene rings are close to 180° with values of 174.06 (15) and 179.85 (14)°.
The Synthesis, Photophysical Characterization, And X‐Ray Structure Analysis Of Two Polymorphs Of 4,4′‐Diacetylstilbene, Ralph Isovitsch, Cameron Pye, Frank R. Fronczek
The Synthesis, Photophysical Characterization, And X‐Ray Structure Analysis Of Two Polymorphs Of 4,4′‐Diacetylstilbene, Ralph Isovitsch, Cameron Pye, Frank R. Fronczek
Chemistry
A palladium(II) acetate‐catalyzed synthesis of 1 that utilizes the novel triazene 1‐{4‐[(E)‐morpholin‐4‐yldiazenyl]phenyl}ethanone as a synthon is described. The room temperature absorption spectra of 1 in various solvents exhibited a π→π* transition in the range of 330–350 nm. Compound 1 was observed to be luminescent, with room‐temperature solution and solid‐state emission spectra that exhibited maxima in the range 400–500 nm. All room‐temperature absorption and emission spectra exhibited some degree of vibrational structure. The emission spectrum of 1 at 77 K in propanenitrile glass was broad and featureless with a maximum at 447 nm. Compound 1 crystallized …
2,3-Bis(Bromomethyl)-1,4-Diphenylbenzene, Jonathan B. Briggs, Mikael D. Jazdzyk, Glen P. Miller
2,3-Bis(Bromomethyl)-1,4-Diphenylbenzene, Jonathan B. Briggs, Mikael D. Jazdzyk, Glen P. Miller
Chemistry
In the title compound, C(20)H(16)Br(2), the terminal phenyl groups are twisted away from the central ring by approximately 55 and -125 degrees (average of four dihedral angles each), respectively. The crystal structure is stabilized by a combination of interMolecular and intraMolecular interactions including interMolecular pi-pi stacking interactions [C atoms of closest contact = 3.423 ( 5) angstrom].