SYNTHESIS AND CHARACTERIZATION OF MONONUCLEAR AND DINUCLEAR ZINC-ARYLAZOIMIDAZOLE COMPLEXES. SINGLE-CRYSTAL X-RAY STRUCTURE OF [Zn(HaaiEt)_4](CIO_4)2 AND [Zn(HaaiMe) (mu-l,l-N_3)(N_3)]_2 [HaaiEt =e l-ETHYL-2- (PHENYLAZO)IMIDAZOLE; HaaiMe = l-METHYL-2

摘要

Zn(ClO_4)_2 centre dot 6H_2O reacts with l-alkyl-2-(arylazo)imidazoles [RaaiR', where R = H (a), Me (b); R' = Me (1), Et (2)] affording orange-yellow [Zn(RaaiR')_4](ClO_4)_2 (3,4) complexes. When excess sodium azide is added to the reaction, orange-red, dimeric azido-complexes of the type [Zn(RaaiR')(N_3)(mu-l,1-N_3)]_2 (5,6) are obtained. Both types of complex were characterized. Structures were confirmed by single-crystal X-ray diffraction studies of [Zn(HaaiEt)_4](ClO_4)_2 (3b) and [Zn(HaaiMe)(N_3,)(mu-l,l-N_3)]_2 (5a).