Complex nickel nitrites. I. Complexes of N-substituted Propane-1,3-diamines

Abstract

Complex nickel(II) nitrites, NiL_n(NO₂)₂, can be prepared in good yield by the reaction of amines with K₄Ni(NO₂)₆. Bonding of the NO₂ group depends on the nature of the amine. Paramagnetic, octahedral complexes of propane-1,3-diamine (pn) and some of its N-alkyl derivatives were: pn, n = 2, dinitro; N-methyl derivative, n = 2, dinitrito; N-ethyl, n = 2, dinitrito; N,N-dimethyl, n = 1, dinitrito with bidentate nitrito groups. Corresponding thiocyanate complexes were all NiL₂(NCS)₂. Homopiperazine gave diamagnetic, square-planar complexes, NiL₂²⁺, for all anions examined.