摘要:

AbstractPolarized Raman and resonance Raman spectra of single crystals of one‐dimensional mixed valence platinum complexes have been recorded and studied. Polarized Raman spectra of single crystals of [M(II) (en)2M(IV)(en)2X2](ClO4)4, where X = Cl or Br, M = Pt or Pd and en = ethylenediamine, show strong resonance enhancement of the…XM(IV)X…symmetric stretching vibration in the chain. Analysis of the spectra shows that the metals are coupled in the chain through the halide atoms. The coupling occurs by electron charge transfer via thedz2‐orbitals of the metal from the lower to the higher oxid

ISSN:0377-0486    

DOI:10.1002/jrs.1250090202

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractRaman spectra of solid 2,4,6‐trichlorophenol and 2,4,6‐tribromophenol (s‐TCP ands‐TBP) have been recorded at 80 and 300 K. Infrared spectra in the region 4000–200 cm−1have also been recorded of the solids and of dilute solutions in CCl4. Vibrational assignments and qualitative descriptions of the normal modes of these compounds are proposed on the basis of substituted benzene molecules withCssymmetry. Some evidence for intermolecular hydrogen bonding has been found in the solid state infrared spectra of both compounds, but they do not appear to self‐associate in

ISSN:0377-0486    

DOI:10.1002/jrs.1250090203

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe Raman signal from thev1mode of trichlorosilane has been examined by dilution in several solvents. Temperature studies were also conducted and include data from the disordered solid phase of the neat sample. The results of these studies show that (a) thev1fundamental is involved in a dephasing process process controlled by the intramolecular potential function; (b) the neat liquid has a longer dephasing time than in any of the solvents, indicating memory retention as an intermolecular process. Additionally, environmental effects (broadening) are pronounced and appear to be related to the dipole moment of the solvent. The theoretical model proposed by Rothschild1is used to strengthen the interpretive case offered for the dephasing mechanistic process of the fundamental.

ISSN:0377-0486    

DOI:10.1002/jrs.1250090204

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe Raman spectrum of chemisorbed benzene and deuterated benzene has been measured in the frequency range of 200–3400 cm−1in backscattering geometry. In order to suppress the strong second‐order light‐scattering spectrum of glass, a difference Raman scattering cell has been developed. The vibrtational bands are shifted only slightly compared with liquid benzene. Additional bands are found, which are symmetry forbidden in free benzene. These bands result from symmetry lowering produced by the site symmetry of the surface. Compared with the Raman spectrum of liquid benzene, the vibrational bands of chemisorbed benzene are strongly e

ISSN:0377-0486    

DOI:10.1002/jrs.1250090205

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractRaman spectra of aqueous zinc halide solutions are obtained in both liquid and glassy states. It is shown that the detection and characterization of weak low frequency Raman bands in aqueous solutions is much easier in the Raman spectrum for the glassy state than for the liquid state. Comparison of the spectra shows that the tetrahedral ZnX 42−ions are the most stable ionic entities in the glassy st

ISSN:0377-0486    

DOI:10.1002/jrs.1250090206

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractPyridine‐4‐d, pyridine‐2,6‐d2and pyridine 2,4,6‐d3have been prepared. The isotopic composition and label specificity of each of several preparations were verified by mass spectroscopy and proton NMR. The liquid phase Raman and the liquid and vapor phase infrared spectra are reported for these materials and for pyridine at room temperature. A new vibrational assignment consistent with frequency sum and product rule constraints is proposed. Thermodynamic functions calculated from the pyridine assignment are found to be in good agreement with published experiment

ISSN:0377-0486    

DOI:10.1002/jrs.1250090207

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe infrared spectra (from 4000 to 200 cm−1) and Raman spectra of ethylcyclopropane, isopropylcyclopropane and ethyloxirane have been recorded in solid, liquid and vapor phases. From the spectral data, ethylcyclopropane has been shown to exist solely in thegaucheconformation in all three states of matter. Likewise, isopropylcyclopropane exists solely in a bisected conformation having a mirror plane of symmetry. On the other hand, however, in the gas phase ethyloxirane exists as an equilibrium mixture of the two nonequivalentgaucherotameric forms. In all cases, steric repulsions between methyl hydrogens and β‐ring hydrogens preclude the existence of possible conformers where a methyl group is situtated over (cis) the three‐membered ring. Tentative vibrational assignments have been proposed for major spectral bands of all three mol

ISSN:0377-0486    

DOI:10.1002/jrs.1250090208

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe infrared and Raman spectra of potassium and sodium cyanides have been recorded in the two orthorhombic phases (Ising spin disordered phase II and ordered phase III). By comparing the intensity of the modes we show that the two crystals have a different behaviour, though they belong to the same space group. In particular, the two librational modes in phase II are accidentally degenerate in KCN (σ ≈︁ 116 cm−1atT= 150 K), while they are widely separated in NaCN (σ = 218 cm−1and 104 cm−1atT= 250 K). In KCN the second mode seems due to the disorder. Some possible attributions for the translatory motions in phase III are given, based on coupling with the libratio

ISSN:0377-0486    

DOI:10.1002/jrs.1250090209

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe infrared spectra of gaseous and solid vinyloxirane have been recorded, while Raman spectra of all three physical states have been obtained. The vibrational data for the liquid and vapor phases are consistent with the presence of three conformations, the s‐transand two nonequivalentgaucheforms. The energy separations between the most stable s‐transand each of the other confromers have been determined for the liquid state to be 1.1 ± 0.2 and 0.8 ± 0.2 kcal mol−1by measuring the temperature dependence of sets of Raman lines. A complete vibrational assignment is proposed for the s‐transconformer, and the identities of the less stable conformers are discussed in terms of previous studies of related

ISSN:0377-0486    

DOI:10.1002/jrs.1250090210

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY

摘要:

AbstractThe excitation profiles of several vibrational Raman bands of diethylcyanine are examined where the exictation is applied to the first electronic transition. In order to analyse these profiles, firstly, a study of the electronic spectrum is carried out: the symmetry of the first electronic state is determined from an experimental approach (polarization of vibrational and electronic spectra) and from a theoretical approach (Hartree‐Fock semiempirical calculations); secondly, the vibration excitation profile located at 1368 cm−1is analysed. The parameters of this vibration (1368 cm−1) and the mechanism of the scattering are obtained with the help of Raman and absorption spectra. A comparison between the scattered intensity and the 1368 cm−1vibration intensity allows the studies of excitation profiles of the other vib

ISSN:0377-0486    

DOI:10.1002/jrs.1250090211

出版商:John Wiley&Sons, Ltd.    

年代:1980

数据来源: WILEY