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1H- and 13C-NMR. Studies of some metal complexes of o, o′-dihydroxyazobenzenes

✍ Scribed by Paul S. Pregosin; Eginhard Steiner

Publisher
John Wiley and Sons
Year
1979
Tongue
German
Weight
215 KB
Volume
62
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The aromatic ^1^H‐ and ^13^C‐NMR. spectra of some metal complexes of o, o′‐dihydroxyazobenzenes are shown to be useful in distinguishing the two possible isomers (acolar and discolar) stemming from the non equivalence of the two ligating azo nitrogen atoms. The ortho aromatic carbon atoms, C(6) and C(12) experience relatively large upfield shifts between 12.8 and 15.7 ppm when the adjacent nitrogen atom is coordinated. The protons attached to these carbon atoms are shifted downfield. The values ^n^J (^15^N, ^13^C) for the ligand 2,2′‐dihydroxy‐3‐methyl‐4′‐chloro‐5‐(t‐butyl)‐^15^N‐azobenzene are reported.

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