SOME SIX-CO-ORDINATED COMPLEXES OF NICKEL(II) : NITRITO-AMMINES OF NICKEL(II)

Several nitrito-ammines of nickel(II) have been prepared, viz., Ni [o-C₆H₄(NH₂)₂]₂ (NO₂)₂, Ni[C₆H₅ CH₂NH₂]₄(NO₂)₂ and \(Ni_2[H_2NCH_2CH_2NH_2]_2(NO_2)_3(OH)\). These are all red in colour, insoluble in water and paramagnetic with a moment of about 3 Bohr magnetons. These are believed to be six-co­ordinated nickel(II) complexes, and a polynuclear structure has therefore been assigned to the ethylene­diamine complex.