摘要:

AbstractA study of the electronic, infrared, Raman and pre‐resonace Raman spectra of the solid complex tris(8‐hydroxyquinolinato)vanadium(III) was performed. The excitation profiles of the vibrational modes that show preresonance on excitation with laser lines within the electronic bands in the visible region are reported and, on this basis and molecular orbital calculations, several vibrational and electronic absorption bands were assig

ISSN:0377-0486    

DOI:10.1002/jrs.1250200902

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractA systematic analysis of the IR and Raman spectra of dipotassium tartrate hemihydrate (K2C4H4O6· ½H2O) in terms of the standard frequency correlations, deuteration shift and typical nature (with respect to intensity and width) of bands due to different modes is reported. The bands due to the internal modes (excluding some skeletal modes) of the C4H4O 62−ion appear as doublets. For certain modes (e.g. βCH, νC(OH)and δCOO), doublets arise due to interaction between two identical oscillators of two identical groups in COO(HO)HCCH(OH)COO2−, whereas for other modes (e.g. νCH, ν COa, ν COs, δCOH, and τCOO) they arise due to crystallographically distinguishable sites for two id

ISSN:0377-0486    

DOI:10.1002/jrs.1250200903

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe FT‐IR and Raman spectra of six 1 : 1 complexes produced by reaction of 1,4,7,10‐tetraoxacyclotetradecane [12‐crown(4)], 1,4,7,10,13‐pentaoxacyclopentadecane [15‐crown(5)]and 1,4,7,10,13,16‐hexaoxacyclooctadecane [18‐crown(6)] with MnX2(X = CL, Br) were recorded in the solid state. Vibrational assignements are proposed for the major bands observed in the spectra of these new crown ether complexes, especially the antisymmetric and symmetric COC stretching modes in the 1200–800 cm−1region and the MnO and MnX stretching vibrations in the region below 400 cm−1. Probable structures of these c

ISSN:0377-0486    

DOI:10.1002/jrs.1250200904

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe surface‐enhanced Raman scattering of cyclohexanethiol was investigated in a silver sol. Cyclohexanethiol was found to adsorb dissociatively after losing its thiol proton and adsorption was found to occur via its sulphur atom. Both the equatorial and axial chair conformers were found to exist on the surface at low surface coverage. However, at full monolayer coverage, the equatorial chair was the sole conformation of the adsorbed thiolate. An improved vibrational assignment for the molecule has been mad

ISSN:0377-0486    

DOI:10.1002/jrs.1250200905

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractChlorocarbony fluorocarbonyl disulphide, CIC(O)SSC(O)F, was prepared from bis(fluorocarbonyl) disulphide and BCI3. IR data of the vapour, liquid and matrix‐isolated CIC(O)SSC(O)F at low temperature together with the Raman spectrum of the liquid suggest the existence of a more abundant non‐planar conformer with symmetry C1in both the vapour and liquid phases. For all but the torsional modes of this conformer wavenumbers are reported. However, the valence force constants were calculated by a semi‐empirical method. The study was complemented with the characterization of the compound by19F NMR and mass sp

ISSN:0377-0486    

DOI:10.1002/jrs.1250200906

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe lattice vibrations of the low‐temperature phase of CH3CCl3and CD3CCl3have been observed by Raman and far‐infrared techniques. The results are compared with the predictions of group theory, and the peaks are assigned on the basic of their frequency shifts on deuteration. Low‐temperature Raman and far‐infrared spectra of the internal modes are also pr

ISSN:0377-0486    

DOI:10.1002/jrs.1250200907

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractResonance excitation profiles have been obtained for cobalt phthalecyanine at both room temperature and 10 K using a compressed disc of silver and the phthalocyanine. Low‐frequency vibrations are shown to be influenced mainly by displacements on the bonding nitrogen, but high‐frequency vibrations show a more complex pattern with some evidence that the vibrations v3and v28depend on Cαdisplacements. By comparison with copper, there appears to be a greater degree of scattering from 0–0 and 0–1 transitions and there is a shift towards increase 0–0 scattering in the sharper low‐temperature profiles. It is concluded that a distortion, dynamic at room temperature and static at low temperature, plays a key role in determining the relative scattering and this distortion is larger for copper phthalocyanine than for cobalt ph

ISSN:0377-0486    

DOI:10.1002/jrs.1250200908

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractResonance Raman excitation profiles of some azo dyes were studies and interpreted in terms of a model that treats vibratious as displaced harmonic oscilators. It is shown that the visible absorption spectrum is formed by two overlapping electronic transitions of a mixed charge‐transfer and nπ* charact

ISSN:0377-0486    

DOI:10.1002/jrs.1250200909

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractThe Raman‐active lattice modes of crystalline P4Se3at room temperature have been calculated in the rigid–body approximation by using estimated atom‐atom potentials for the Se atoms. The agreement is satisfactory and reveals several types of couplings of the different degrees of freedom. The calculated lattice energy is of the correct order of magnitude. The potentials obtained show characteristic features which correlate with the presence of short SeSe distances in the

ISSN:0377-0486    

DOI:10.1002/jrs.1250200910

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY

摘要:

AbstractForce constant–structure correlations are presented for CF, CCl, CBr, CI and NO stretching force constants versus bond lengths for a wide variety o

ISSN:0377-0486    

DOI:10.1002/jrs.1250200911

出版商:John Wiley&Sons, Ltd.    

年代:1989

数据来源: WILEY