Conformation of open‐chain compounds. Part 3. Carbon‐halogen stretching frequencies and conformation of some vicinal dihalides
作者:
C. Altona,
H.J. Hageman,
期刊:
Recueil des Travaux Chimiques des Pays‐Bas
(WILEY Available online 1969)
卷期:
Volume 88,
issue 1
页码: 33-42
ISSN:0165-0513
年代: 1969
DOI:10.1002/recl.19690880107
出版商: WILEY‐VCH Verlag
数据来源: WILEY
摘要:
AbstractA study of the infrared and Raman spectra of some vicinal dihalogeno‐ethanes, ‐propanes and ‐butanes with predominant antiperiplanar orientation in the straight chain and branched series, reveals that the two C‐Hal stretching frequencies occur characteristically as a more or less strongly coupled pair: an intense Raman band (νs) and a strong infrared active mode of vibration (νas) at lower frequencey.The C‐Hal frequencies of the gauche conformations are weakly coupled.The position of the bands and the difference Δν = νs− νasare functions of the chemical/geometrical structure in the vicinity of the C‐Hal bonds. Empirical rules are presented by which the C‐Hal frequencies or, in strongly coupled systems, the average frequency ofantias well as ofgaucheforms can be predict
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