625846-14-2Relevant academic research and scientific papers
Mono- and binuclear cobalt(II)-azido complexes of arylazoimidazole: Synthesis, spectral characterization, electrochemistry and crystal structure
Ray, Umasankar,Chand, Brojogopal,Mostafa, Golam,Cheng, Jack,Lu, Tian-Huey,Sinha, Chittaranjan
, p. 2587 - 2594 (2003)
Upon setting up proper reaction conditions 1-alkyl-2-(arylazo)imidazoles (RaaiR′ where R = H (a), Me (b); R′= Me (1/3/5), Et (2/4/6) may react with Co(OAc)2·4H2O and NaN3 in methanolic solution to give two classes of azido complexes: mononuclear bischelated [Co(RaaiR′)2(N3)2] (3,4) and binuclear μ-(1,1) azido bridged mono-chelated [Co(RaaiR′)(μ-(1)N3)(μ-(1,1)N3]2 (5,6) complexes. They are characterized by UV-Vis, IR spectra, room temperature magnetism and they have been structurally confirmed by X-ray diffraction study of [Co(MeaaiMe)2(N3)2] (3b) and [Co{(μ-1)N3}(MeaaiMe)]2 (5b). The mononuclear complex (3b) is distorted octahedral whereas the binuclear azide bridged complex (5b) has the distorted square pyramidal geometry around the cobalt(II) centre. Redox properties of the complexes are examined by cyclic voltammetry and show a high potential Co(III)/Co(II) couple along with ligand reductions. EHMO calculation and comparison between the two types of complexes explain the spectral and redox properties of the complexes.
