Synthesis and characterization of chromium(II), manganese(II), iron(II), cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II) and mercury(II) complexes of N,N' -diphenylhydrazine and their triphenylphosphine derivatives

Abstract

The reaction of anhydrous metal(II) chlorides with N,N' -diphenylhydrazine in THF afforded the isolation of polymeric compounds of the type [M(N₂H₂Ph₂)₂Cl₂]_n where M = Cr¹¹ (1), Mn¹¹ (2), Fe¹¹ (3), CO¹¹ (4), Ni¹¹ (5), CU¹¹ (6), Zn¹¹ (7), Cd¹¹ (8), Hg¹¹ (9). However, the reaction with [M(PPh₃)₂CI₂] resulted in the formation of N,N' -diphenvlhvdrazine bridged dimeric complexes of the type [M(PPh₃)₂ N₂H₂Ph₂)Cl₂]₂ where M = Co¹¹ (4a), Ni¹¹ (Sa), CU¹¹ (6a), Zn¹¹ {7a), Cd¹¹ (Sa), Hg¹¹ (9a). The mode of bonding of N,N' -diphenylhydrazine in these compounds has been confirmed on the basis of band position of N-N stretching mode. The low electrical conductivity of the complexes derived from [M(PPh₃₎₂,CI₂] confirm their covalent nature.