Chemistry of azopyrimidines: Synthesis, spectral characterization, electrochemistry and X-ray crystal structure of bis[2-(arylazo)pyrimidine] complexes of copper(I)
Journal
Polyhedron
Journal Volume
18
Journal Issue
14
Pages
1909-1915
Date Issued
1999
Author(s)
Abstract
2-(Arylazo)pyrimidines (aapm, 3) have been synthesized by condensing nitrosoaromatics with 2-aminopyrimidine. They yield cationic bis-chelated complexes with copper(I), Cu(aapm)2+ and are isolated as perchlorate salts. The complexes are 1:1 electrolytes in MeOH and exhibit intense MLCT transitions in the visible region. The N=N stretch in copper(I) complexes shows a large shift to lower frequency (approx. 1315 cm-1) from the free ligand value (approx. 1425 cm-1) due to d(Cu)→π*(aapm) back bonding. The complexes show highly resolved symmetrical 1H NMR spectra. In MeOH the Cu(aapm)22+/Cu(aapm)2+ couple appears at E1/2 at approx. 0.7 V versus SCE at 298 K. The structure has been confirmed by X-ray crystallography. © Elsevier Science Ltd.
SDGs
Type
journal article