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Über die sterische Anordnung von Chrom(III)‐ und Kobalt(III)‐1:2‐Azofarbstoff‐Komplexen mit annellierten 5/5‐ und 5/6‐Chelatringen, gebildet mit Azofarbstoffen aus 4,5‐Diphenylimidazol als Kupplungskomponente
Author(s) -
Schetty G.
Publication year - 1968
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.19680510311
Subject(s) - chemistry , chromium , octahedron , crystallography , metal , crystal structure , stereochemistry , organic chemistry
On cuppling 4,5‐diphenylimidazole with a diazotised o ‐aminophenol or with a diazotised anthranilic acid, tridentate ligands are produced which, on co‐ordination with the metal atom, form ortho ‐condensed 5/5‐ or 5/6‐membered rings. Both ligand systems can form 1:2 chromium (III) and 1:2 cobalt (III) complexes having the D REW ‐P FITZNER arrangement. The dimensions of the o ‐carboxyazo dyestuff fit well, those of the o ‐hydroxyazo dyestuff fit badly into the octahedral crystal lattice. In the same way, on co‐ordination one dyestuff is not deformed but the other is very greatly deformed, as can be concluded from a comparison of the electron spectra of the metal‐free dyestuff with those of the complexes.