摘要:

Studies were made on the electronic absorption spectra, delayed fluorescence and phosphorescence spectra, excitation spectra of the delayed fluorescence and phosphorescence, and phase-sensitive fluorescence spectra for different concentrations of 10-formylmethylisoalloxazine (FMF) and riboflavin (RF) in the films of polyvinyl alcohol (PVA) at room (295 K) and low (103 K) temperature. It was found that the delayed fluorescence and phosphorescence of the flavins stabilized with PVA matrix was significantly affected by the relaxation effects, as well as that flavins in the excitation state formed molecular complexes (excimers or exciplexes).

ISSN:0038-7010    

DOI:10.1080/00387018808075711

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The vibrational frequencies of six dimethyldithiocarbamate complexes have been calculated for a 1:1 molecular model of C., symmetry, using a stepwise coupling method. The calculated force constants are in agreement with previously reported data on some of these species, implying that the stepwise coupling method used here can also be applied to the study of larger molecules than those previously reported.

ISSN:0038-7010    

DOI:10.1080/00387018808075712

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The absorption spectrum of ZrO has been obtaioed io the 560-670 nm region by intracavity laser spectroscopy. Vibrational analyses of e3Π -a3Δ and d3Φ -a3Δ transitions have been carried out with accounting for an anomalous multiplet splitting. Molecular constants for the upper e3Π and d3Φ states have been determined.

ISSN:0038-7010    

DOI:10.1080/00387018808075713

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Force fields have been calculated for 2-Chloro and 2-Bromo derivatives of Selenopnene and Tellurophene. The calculation of the fundamental frequencies was performed starting from a GVTF which was proven satisfactory for the heter-ocyclic parent molecules. In the initial steps we refined only the force constants mostly involving the substituent vibrational modes. In the final step, some force constants involving the ring motions were also released, in order to obtain the best fit. The procedure has been developed with the aim of getting information on the influence of the substituent effects on the heteroaromatic ring force field.

ISSN:0038-7010    

DOI:10.1080/00387018808075714

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Carbotn-13 NHR assignment of eight N-(2,4- dinitrophenyl) amines was achived. She six corresponding N- Oxides and their thermal rearr-angement products were also analyzed. The N-oxidation effect on the carbon-13 chemical shift is discussed.

ISSN:0038-7010    

DOI:10.1080/00387018808075715

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Lower furnace heating rates lead to an improvement of precision when working with non-optimized detection systems. The improvement can be ascribed to the relative improvement of time resolution of the detection system.

ISSN:0038-7010    

DOI:10.1080/00387018808075716

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

The electronic absorption spectrum of intermoiecular charge-transfer complex formed between piperidine as electron donor and tetrachloro-l,4-benzoquinone as electron acceptor was studied in 30 different solvents. The band shifts are discussed on the basis of dielectric, refractive index and polarity functions.

ISSN:0038-7010    

DOI:10.1080/00387018808075717

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Diffuse reflectance spectra of vanadocene adsorbed on silica were recorded in the spectral region 4000-30 000 cm−1. A d-d band around 13 000 cm−1indicated, that vanadocene formed V(cp)2+on the support when the number of silanol groups was decreased. This cation is suggested to be stabilized by the negative charge of deprotonated silanol groups.

ISSN:0038-7010    

DOI:10.1080/00387018808075718

出版商:Taylor & Francis Group    

年代:1988

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:10.1080/00387018808075710

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor