TETRAHEDRAL MANGANESE(II) COMPLEXES OF l-ALKYL-2-(ARYLAZO)IMIDAZOLES. X-RAY CRYSTAL STRUCTURE OF [Mn(HaaiMe)_4](ClO_4)_2 center dot DMF (HaaiMe = 1-M ETHYL-2-(PHENYLAZO)IMIDAZOLE)

摘要

[Mn(RaaiR')_4](ClO_4)_2 complexes have been synthesised by reacting Mn(ClO_4)_2 center dot 6H_2O and RaaiR' in methanol (RaaiR'= l-alkyl-2-arylazo)imidazole, R = H (a), Me (b), Cl~-(c); R' = Me (1), Et (2)). The orange-red crystalline compounds were characterised by microanalytical, spectroscopic, magnetic, thermal and electrochemical data. A single-crystal X-ray diffraction study of a DMF adduct of la revealed tetrahedral orientation of four ligands coordinating through imidazole-N while the azophenyl group (-N=N-Ph) is pendant. Cyclic voltammetry shows the Mn(III)/Mn(II) couple at > 1.0 V along with azo reductions.