198347-77-2Relevant academic research and scientific papers
Chemistry of azoimidazoles: Synthesis, spectral characterization and redox properties of bis(N(1)-alkyl-2-(arylazo)imidazole) copper(I) and silver(I) complexes
Misra, Tarun K.,Das, Debasis,Sinha, Chittaranjan
, p. 4163 - 4170 (2008/10/09)
N(1)-Alkyl-2(arylazo)imidazoles p-C6H4N=NC3H2N N(1)R′, RaaiR′, R′ = Me (2), Et (3); R = H(a), Me(b), OMe(c), Cl(d), NO2(e) yield catonic bis-chelated complexes with both copper(I) (4,5) and silver(I) (6,7). These were isolated as perchlorate salts and the composition is supported by elemental analyses. The complexes are 1:1 electrolytes in methanol. The N=N stretch in copper(I) complexes shows a large shift to lower frequency (ca 1335 cm-1) from the free ligand value (ca 1400 cm-1) due to d(Cu) → π* (RaaiR′) back bonding. This effect is much less pronounced in silver(I) complexes indicating a negligible dπ-π* (RaaiR′) interaction. The complexes show highly resolved symmetrical 1H NMR spectra. The copper(I) complexes exhibit intense MLCT transitions in the visible region. In methanol the Cu(RaaiR′)2+2/Cu(RaaiRprime;)+ 2 couple has E1/2 ca 0.45 V vs SCE at 298 K. The high positive potential may be due to the distortion in the geometry of Cu(RaaiR)+2.
