摘要:

The infrared spectra of 1,2,3-; 1,2,4- and 1,3,5-trimethylbenzenes have been recorded in the liquid phase in the region 250–4000 cm−1on a Perkin Elmer Grating Spectrophotometer model 521. Under the general symmetry considerations, the molecule 1,2,4-belongs to C2vpoint group, the 1,2,3-isomer belongs to Cs and the 1,3,5-isomer to D3hpoint group. The observed bands have been assigned to different modes of vibrations.

ISSN:0038-7010    

DOI:10.1080/00387017508067335

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The effect of the length and topology of the conjugated bond system on the relative location of the nπ*- and ππ*- molecular states of the unsaturated and aromatic carbonyl molecules is theoretically investigated.

ISSN:0038-7010    

DOI:10.1080/00387017508067336

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Low temperature 220 and 300 MHz1H n.m.r. spectra of 1-(2′-hydroxythiobenzoyl) piperidine in CDCl3and acetone-d6show evidence for the temperature dependence of the amplitude of torsional librations about the thioamide C‒N bond. The coalescence of the signals from the piperidine α‒CH2protonscisto the thiocarbonyl group before those of thetransα‒CH2protons (where the librational coalescence temperature is near 0°C) as the temperature is raised is ascribed to more effective equalization of the twocisprotons in the magnetic field of the C˭S bond.

ISSN:0038-7010    

DOI:10.1080/00387017508067337

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Evidence is presented to confirm the assignments of the bridgehead carbon atoms of quinoline. The chemical shifts of C-9 and C-10 in a series of methylquinoline derivatives were determined and their respective assignments deduced from a consideration of shielding effects. The selection of suitable reference compounds is discussed.

ISSN:0038-7010    

DOI:10.1080/00387017508067338

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Although various structural properties can be determined by investigating the far-infrared, the lack of systematic results for most classes of organic molecules seems to hinder a number of workers from undertaking studies in this region. As a part of an extensive investigation in this field (1), we report here the data and our interpretation for a group of acetophenones.

ISSN:0038-7010    

DOI:10.1080/00387017508067339

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A new method of calculating the Σ matrix is based on a polynomial fitted point-wise to the function coth(hc ωk/2kT). Equations in closed form are deduced for the two-dimensional case and for T = O in particular. The method is applied to derive in closed form the meansquare amplitude at absolute zero for the bond distance in a water-type molecule.

ISSN:0038-7010    

DOI:10.1080/00387017508067340

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Harmonic force fields are developed for the Ga2Br6and Ga2I6molecules. The analysis confirms previous assignments of experimental frequencies. Mean amplitudes of vibration are calculated.

ISSN:0038-7010    

DOI:10.1080/00387017508067341

出版商:Taylor & Francis Group    

年代:1975

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:10.1080/00387017508067334

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor