Dinuclear complexes with a ?-cyano ligand. Part XI(1). Synthesis and characterization of several derivatives ofcis-[Co(NH3)(en)2(H2O)]3+

Abstract

The new complex double saltscw-[Co(NH3)(en)2(H2O)]2 [M(CN)4]3 (en = ethylenediamine; M = Ni, Pd or Pt),cis-[Co(NH3(en)2(H2O)]2[FeNO(CN)5]3 andcis-[Co(NH3)(en)2(H2O)][Co(CN)6] have been synthesized and by anation in the solid state the corresponding new dinuclear complexes with a cyano bridgecis- ortrans-[(NH3)(en)2Co-NC-M(CN)3]2 [M(CN)4] (M = Ni, Pd or Pt);cis-, trans-[(NH3)(en)2Co-NC-FeNO(CN)4]2[FeNO(CN)5] andcis-[(NH3)(en)2Co-NC-Co(CN)5 have been prepared. The complexes have been characterized by chemical analysis, t.g. measurements, and by i.r. and electronic spectroscopy. With [Ni(CN)4][2− and [Co(CN)in]63− only thecis-isomer is produced; with [Pd(CN)4]2−, [Pt(CN)4]2− and [FeNO(CN)5]2− thetrans- isomer is the dominant species. The dinuclear complex derived from [Pt(CN)4]2− shows strong Pt-Pt interactions both in the solid state and in solution.