摘要:

The electronic absorptíon spectrum of KMnO4in water solution was analyzed. The spectral contour was resolved into component bands and then Franck-Condon approach was applied. In the investigated range of 13000–48000 cm−1a presence of three structureless and of two vibronic strong bands was stated. The change in the Mn-O equilibrium bond length was found to be 10.5pm for 2e·1t1transition (vibronic band about 18000cm−1) and to be 16pm for the 2e·3t2transition (vibronic band about. 30000cm−1). The appropriate wavenumber of the vibrational mode in these excited electronic states was found to be 735cm−1and about 780cm−1, respectively. The ground electronic state wavenumber of the totally symmetric vibrational mode was fitted to be equal to 828cm−1. Details of the proposed method of computer elaboration of electronic spectra with vibrational structure were discussed.

ISSN:0038-7010    

DOI:10.1080/00387018708081600

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The 60 MHz1NMR spectra of racemic metapramine,l, have been studied in CDCl3solution at 28° with the achiral shift reagent, tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato) europium(III),2, and the chiral reagent, tris[3-(heptafluoropropylhydroxy-methylene)-d-camphoratoleuropium(III),3. Reagent2additions resulted in changes of the apparent vicinal coupling constants within the CH-CH2moiety, as observed from the NCH methine resonance. The chiral3led to observable enantiomeric shift differences for the 2° NCH3signal that could have potential for direct optical purity determinations of1. Results with2and3are interpreted as consistent with major shift reagent binding at the 2° nitrogen, with conformer equilibria changes sterically induced by this complexation.

ISSN:0038-7010    

DOI:10.1080/00387018708081601

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The mechanism for the Gif system of selective oxidation of hydrocarbons has been studied using the GC-MS technique. Several observations reported here concerning bipyridines, pyridine-hydrocarbon coupling products and oxidation products themselves contribute to the elaboration of the proposed mechanism.

ISSN:0038-7010    

DOI:10.1080/00387018708081602

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The stabilities of some complexes of 1,4,7,10-tetraoxacyclo -dodecane were determined from the13C dipole-dipole relaxation time measurements of the free and complexed macrocyclic ligand in DOH. The association constants, Kawere obtained from the relationship of Pc= (1/Tobs1- 1/T10)/(1/T10- 1/T10) in which T10and T10are of the relaxation times of complexed and the free ligands respectively and, Pcis the complexed ligand fraction.

ISSN:0038-7010    

DOI:10.1080/00387018708081603

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Electron spectroscopy was carried out in the solid state on dicyclopentadienyl dithiolato Ti derivatives. Although the v.-U.V. spectroscopy is not very sensitive to different substitution on the cyclopentadienyl or ligand system, this method is a powerful and simple means for the test for purity of the organometal dithiolates. This fact is of great importance as many of these compounds show tumor inhibition, and often the toxic decomposition products (e.g. perfluoro diphenyl disulfide or percyano diorganyl disulfide) are difficult to detect in small amounts with standard methods of spectroscopy.

ISSN:0038-7010    

DOI:10.1080/00387018708081604

出版商:Taylor & Francis Group    

年代:1987

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:10.1080/00387018708081599

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor