摘要:

The fluorescence and phosphorescence band positions of mono substituted benzenes are recorded at 77°K in four solvents, and the band maxima are correlated with substituent effects. No correlation of the fluorescence band maxima is obtained until the electron donating substituents are separated from the electron acceptors. The phosphorescence band maxima do not correlate well with Hammett sigma constants. With the exception of N, N-dimethylaniline, the fluorescence maxima are independent of the nature of the solvent. Both good electron donor and acceptor groups diminish the fluorescence and phosphorescence transition energies. With good electron donor and acceptor groups, there is a significant red shift in phosphorescence on going from nonpolar solvents to acetonitrile. The phosphorescence results are interpreted in terms of intramolecular charge transfer (ICT) and charge transfer to solvent (CTTS) processes in competition with one another.

ISSN:0038-7010    

DOI:10.1080/00387017808065110

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The presence of overstrained chemical bonds in mechanically strained polymers, found in papers /1,2/ has promoted clearing up of polymer destruction mechanism under the action of mechanical tension. At the same time the contribution of these bonds in photomechanical processes(simultaneous action of UV-radiation and mechanical loading) still remains not clear. Though, in phenomenological notion UV radiation influence and other outer factors on kinetics of strained polymer destruction have been studied and generalized in papers /3-5/.

ISSN:0038-7010    

DOI:10.1080/00387017808065111

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The spectra of a series of aliphatic and aromatic acylsilanes were recorded using ir, uv,1H,13C, and29Si nmr techniques. The spectra of analogous ketones and an amide and phosphamide were also recorded to permit direct comparison. The silanes consistently exibited a downfield shift of 30 ppm for the13C nmr carbonyl resonances relative to their all-carbon analogs. Similarly, the phosphamide carbonyl resonance showed a 40 ppm downfield shift relative to the corresponding amide. These results are interpreted as indicating multiple bond character in the Si-CO and P-CO bonds.

ISSN:0038-7010    

DOI:10.1080/00387017808065112

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The infrared spectra of the metal complexes of 4-amino-3-pentene-2-one were measured from 4000 - 20 cm−1. The absorption bands were assigned by comparison to other similar molecules: The Cu(II) complex of 4-methylamino-3-pentene-2-one, and complexes of acetylacetone. Force constants for the molecules were calculated using the Axsmmatrix method. The spectra were measured at 298oK and 77oK.

ISSN:0038-7010    

DOI:10.1080/00387017808065113

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The analysis of the vibration spectrum of parabanic acid goes back to 19641mentionning data of Raman spectroscopy made during 19412. The diffusion spectrum of N-deuterated parabanic acid has never been published and nowhere mention is made regarding the depolarisation factor which is so useful when examining vibration spectra. Therefore it seemed wise trying to elucidate the spectrum of parabanic acid on basis of more complete and recent data at least in what concerns stretching and in-plane deformation vibrations.

ISSN:0038-7010    

DOI:10.1080/00387017808065114

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The natural abundance carbon-13 nuclear magnetic resonance spectra of some methaqualone metabolites were recorded using the pulse fourier transform technique. The chemical shift of various carbon resonances have been assigned on the basis of the chemical shift theory, multiplicities observed in SFORD spectrum and comparison with the chemical shifts of the corresponding carbons of methaqualone.

ISSN:0038-7010    

DOI:10.1080/00387017808065115

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387017808065109

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor