Complexes of nickel(II) with ethylenediamine and perchlorate or tetraphenylborate

Abstract

Complexes of nickel(II) and ethylenediamine with the two weakly co-ordinating anions perchlorate and tetraphenylborate have been prepared and their physical properties are reported. The results indicate that in the solid state the diaquo-ion [Ni en₂(OH₂)₂]²⁺ may have the cis or the trans configuration depending on the anion. Two forms of the anhydrous compound Ni en₂(ClO₄)₂, have been obtained and the infrared evidence suggests that the orange form contains ionic perchlorate, while the blue form contains bidentate perchlorate.