摘要:

Relative band strengths of diatomic molecules for which the product of Franck-Condon factor and r-centroid is approximately equal to 1 for (0,0) band can be determined by a simple method which will be in good agreement with the smoothed array of experimental values.

ISSN:0038-7010    

DOI:10.1080/00387017708067485

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Absorption spectra of some rare-earth oxides are obtained and methods of their interpretation are discussed.

ISSN:0038-7010    

DOI:10.1080/00387017708067486

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

Fine structure of energy levels for some compounds is calculated in one-configuration approximation. Slater parameters and spin-orbit coupling constant are determined.

ISSN:0038-7010    

DOI:10.1080/00387017708067487

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The normal coordinate calculations of the complex of SbF5with SO2have been carried out for the CSsymmetry on a modified Urey-Bradley force field. The defined force constants have been adjusted to reproduce the observed fundamental frequencies reported by Byler and Shriver. The potential energy distribution matrix elements have also been calculated for the symmetry co-ordinates to confirm the tentative assignments. The coordination effects on the bond nature of the complex have been discussed using the obtained constants.

ISSN:0038-7010    

DOI:10.1080/00387017708067488

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The chemical shifts of the NHprotons for a series of substituted 2-quinolone derivatives bearing no 4-methyl substituent have been studied. The 8-methyl substituent almost exclusively causes the Inhibition of hydrogen bonding. Some methoxy substituted 2-quinolone derivatives have also been studied as model compounds for the identification of quinolone alkaloids.

ISSN:0038-7010    

DOI:10.1080/00387017708067489

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The13C n.m.r. spectra of a series of 4-quinolone derivatives are presented and discussed, the existence of aperishielding effect in the 2-quinolone series has been verified. Long range13C -1H coupling constants are reported for some methylquinolones which have been correlated with1H -1H coupling constants.

ISSN:0038-7010    

DOI:10.1080/00387017708067490

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

In papers1–3the chemical shifts of carboxyl proton of the carboxylic acids have been found to be temperature dependent. The existence of moromer-cyclic dimer self-association of carborylic acids in an inert solvent (cyclohexane) only In a low concentration range (up to 0.07 mol fraction) has also been determined. Since the equiliarium constant of self-association increases essentially with the temperatures, decrease,3the chemical shift of carboxyl proton at low temperature (below+lO°C) may be expected to be approximately equal to the chemical shift of the cyclic dimers. In such a way the temperature dependence of chemical shift of the cyclic dimers may be experimentally measured.

ISSN:0038-7010    

DOI:10.1080/00387017708067491

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The proton NMR spectra of CH3-CO-CH3, CH3-CO-C2H5, C2H5-CO-C2H5, C2H5-CO-C2H5, CH3-NH-CH3, and C2H5-NH-C2H5are reported. The observed spectra are explained on the basis of a non-rigid linear structure, in which oo or NH group and CH2group rotate freely with respect to the three hydrogen atoms of CH3group.

ISSN:0038-7010    

DOI:10.1080/00387017708067492

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The infrared spectra (650–145 cm−1) of the complexes [Zn(py)2X2] and [Zn(pyO)2X2] (py = pyridine; pyO = pyridineN-oxide; X = Cl, Br, I) are discussed. Observation of the band shifts induced by deuteration of the heterocyclic rings and by halogen substitution enables unambiguous assignments of νZn-X and νZn-N or νZn-O. In each spectrum, two νZn-X and two νZn-N or νZn-O bands are found. The effect on the spectra of varying the halogen in the pyridineN-oxide complexes suggests that the compounds [Zn(pyO)2X2] (X = Cl, Br) are grossly distorted from tetrahedral symmetry as revealed by preliminary structural studies.

ISSN:0038-7010    

DOI:10.1080/00387017708067493

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor

摘要:

The specific features of one- and two-magnon light absorption caused by the localized exitations of a magnetic ordered crystal with the impurities whose ground state in a cubic crystal field is twofold degenerate (E-term) are analysed.

ISSN:0038-7010    

DOI:10.1080/00387017708067494

出版商:Taylor & Francis Group    

年代:1977

数据来源: Taylor