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Über den pentacylischen Chrom (III)‐Komplex aus 1,6‐Di‐(2‐amino‐benzolsulfonamido)‐hexan ⇉β‐Naphtol
Author(s) -
Schetty G.
Publication year - 1967
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19670500805
Subject(s) - chemistry , valency , ring (chemistry) , chromium , stereochemistry , crystallography , medicinal chemistry , organic chemistry , philosophy , linguistics
A five‐ or six‐membered ring in pentacyclic azo‐dyestuff‐chromium complexes with the sandwich arrangement, having sulphonamido groups as complex formers, was extended into a nine‐membered ring. This altered not only the electron spectrum but also the stability of the complex. Whilst the five‐ and six‐membered pentacycles are very stable, the corresponding nine‐membered ring complex is considerably less stable. Its stability approaches that of the corresponding 1:2‐Cr complexes which, because of deformed valency angles, are very strained and, therefore, are also very unstable. This tension is counteracted in pentacycles having a lower number of members (5 and 6), and so the system is stabilised. If the number of ring members is increased, this counteraction is reduced and, therefore, the stabilising effect is lessened.