摘要:

AbstractRaman spectra of three forms of dithizone are presented. Significant structural changes are indicated in the Raman spectra when a proton is added or lost from neutral dithizone (H2Dz) to form the corresponding conjugate acid of dithizone (H3Dz+) and the dithizone anion (HDz−), respectively. These spectral changes are correlated with the structures previously proposed for these specie

ISSN:0377-0486    

DOI:10.1002/jrs.1250120112

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractReorientational correlation functions have been obtained from the analysis of the totally symmetric vibrations ν4, ν5and ν2of liquid cyclohexane. For the interpretation of the data, the Kubo line shape theory was assumed to be valid. The most reliable results were obtained from the ν4vibration and indicated that reorientational relaxation occurs close to the Debye limit of rotational diffusion. The data are compared with NMR results given in the literature. The effects of rotational‐vibrational coupling are disc

ISSN:0377-0486    

DOI:10.1002/jrs.1250120113

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractThe infrared and Raman spectra of the cesium and tetramethylammonium salts of the hexahydro‐clovohexaborate dianion (B6H62−) are reported and the vibrational fundamentals assigned in detail. An analysis of the fundamental vibrations of this dianion and the isoelectronic carborane, 1, 6‐C2B4H6, shows the latter to have stronger BH and BB

ISSN:0377-0486    

DOI:10.1002/jrs.1250120114

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractRaman intensity measurements have been made of cadmium thiocyanate aqueous solutions containing various ratios of total cadmium to total thioeyanate. Both Job and mole‐ratio methods indicated existence of a distinct complex species with a cadmium to thiocyanate ratio from 1 to 4. All average ligand number values obtained from three different series of experiments lie on the same curve, meaning that only mononuclear species are formed. Four overall stability constants have been calculated. The spectra are consistent with mononuclear complexes in solution, some having SCN−attached to the metal through the sulphur, others through the nitrogen. A band observed at 2132 cm−1was assigned to the Cd(SCN)+complex while bands observed at 2102 and 784 cm−1were attributed to higher members of the stepwise Cd(NCS)n2−nseries. The spectra of solid Cd(SCN)2were in accord with a bridged thiocyanate structure. Assignments were supported by x‐ray structu

ISSN:0377-0486    

DOI:10.1002/jrs.1250120115

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractInfrared and Raman spectra of (bromomethyl)cyclopropane and epibromohydrin have been recorded. Reversible spectral changes which accompany changes in temperature indicate the existence of an equilibrium mixture ofgaucheandcisconformers for (bromomethyl)cyclopropane. Thegaucheform is more stable, and from the variable temperature studies an enthalpy difference of 2.0±0.2 kcal mol−1has been obtained for the liquid phase. For epibromohydrin, two non‐equivalentgaucheconformers have been identified, and thegauche‐1form is more stable than thegauche‐2by 0.80±0.20 kcal mol−1in the liquid phase. Additionally there is evidence for a third conformer, presumably thecisform, but characterization of this conformer has been limited by the complexity of the spectra associated with thegauche‐1 andgauche‐2 forms. Consequently, only a lower limit can be given for the ΔHseparating thecisandgauche‐1 conformers. The results are consistent with previous observations for

ISSN:0377-0486    

DOI:10.1002/jrs.1250120116

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractRaman spectra of two hydroxy azoic model compounds: 3,5‐dimethoxy‐4‐hydroxyazobenzene and 2,6‐dimethoxy‐4‐hydroxyazobenzene are compared. These compounds exist as the pure azo and pure hydrazone forms respectively, thus allowing the assignment of numerous Raman Bands characteristic of each tautomer. The usefulness of Raman spectroscopy for investigating azo‐hydrazone tautomerism is illustrated by a study of 2‐hydroxy‐5‐methyl‐azobenzene which is clearly proved to exist ent

ISSN:0377-0486    

DOI:10.1002/jrs.1250120117

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractQuantum‐chemical methods have been used for the calculation of the intensities of Raman‐active lattice vibrations in crystalline oxamide. In a first step, the frequencies and eigenvectors of the external vibrations in oxamide are calculated by use of the concept of a flexible vibrating molecule within the intermolecular atom‐atom forces. The interactions between macroscopic electric fields and external modes are discussed. The quantum‐mechanical aspects are considered and finally, a semiempirical method is extended to cover the relative Raman intensities of the externa

ISSN:0377-0486    

DOI:10.1002/jrs.1250120118

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

摘要:

AbstractThe frequency of the symmetric stretching vibration ν5of HgCl2in aqueous solutions of HClO4or HNO3shows a strong dependence on acid concentration. This is attributed primarily to a weakening of oxygen‐tomercury electron pair donation as the acid concentration increases, although, for HNO3solutions at high concentrations, the formation of nitrato‐complexes might also be implic

ISSN:0377-0486    

DOI:10.1002/jrs.1250120119

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY

ISSN:0377-0486    

DOI:10.1002/jrs.1250120101

出版商:John Wiley&Sons, Ltd.    

年代:1982

数据来源: WILEY