Synthesis and crystal structure of a cyanido bridged copper(II)-silver( I) bimetallic complex containing a trimeric {[Ag(CN)2]-}3 anion, [Cu(Dach)2-Ag(CN)2-Cu(Dach)2][Ag(CN)2]3 (Dach = cis-1,2-diaminocyclohexane)

A new cyanido-bridged bimetallic copper(II)silver( I) complex, [Cu(Dach)(2)-Ag(CN)(2) -Cu(Dach)(2)] [Ag(CN)(2)](3) (1) (Dach = cis-1,2-diaminocyclohexane), has been prepared and characterized by IR spectroscopy and single crystal X- ray analysis. The crystal structure of complex 1 consists of a centrosymmetric trinuclear cation and three non- coordinated [Ag(CN)(2)](-) ions assembled in the form of a trimer, {[Ag(CN)(2)] -}(3). The complex ion is made up of two [Cu(Dach)(2)](2+) units connected by a bridging [Ag(CN)(2)](-) anion. The copper atom in the complex ion assumes a distorted square pyramidal geometry with CN- nitrogen atoms occupying the apical position. The trinuclear units are joined by hydrogen bonding to form irregular chains.