Transition-element complexes with aliphatic Schiff bases. Part IX. Heterocyclic complexes of nickel(II) formed by reaction of mixtures of diaminoethane and 1,2- or 1,3-diaminopropanenickel complexes with acetone

Abstract

Equimolar mixtures of trisdiaminoethanenickel(II) and tris-(1,2- or 1,3-diaminopropane)nickel(II) perchlorate react with acetone to yield as the major products the nickel(II) complexes heptamethyltetra-azacyclotetradecadienenickel(II), F, and hexamethyltetra-azacyclopentadecadienenickel(II), C, respectively, formed by condensation of four acetone residues and one each of the diamine residues about the nickel ion. The diamagnetic perchlorates C(ClO₄)₂ and F(ClO₄)₂ and the paramagnetic thiocyanates C(NCS)₂ and D(NCS)₂, where D is hexamethyltetra-azacyclohexadecadienenickel(II), formed by reaction of tris-(1,3-diaminopropane)nickel(II) with acetone, are described. The variation in the resistance towards acid hydrolysis of these complexes with varying heterocyclic ring size is discussed [D is more rapidly hydrolysed than C, while F has the extreme resistance towards hydrolysis shown by hexamethyltetra-azacyclotetradecadienenickel(II), formed from trisdiaminoethanenickel(II) and acetone].