title: [[Cu(en)(2)](2)Re(4)Te(4)(CN)(12)].5H(2)O and [[Cu(en)(2)](2)Re(6)Te(8)(CN)(6)].5H(2)O: bonding of a transition-metal complex to a rhenium chalcocyanide cluster.
abstract: The use of a cyano group of a transition-metal cluster complex to bond to another transition-metal complex has been realized in the syntheses of [[Cu(en)(2)](2)Re(4)Te(4)(CN)(12)].5H(2)O (1) and [[Cu(en)(2)](2)Re(6)Te(8)(CN)(6)].5H(2)O (2), (en = ethylenediamine). These compounds have been synthesized by the reaction of an aqueous solution of K(4)[Re(4)Te(4)(CN)(12)].5H(2)O (for 1) or K(4)[Re(6)Te(8)(CN)(6)] (for 2) with an ammonia solution of Cu(en)(2)Cl(2). In each compound, two Cu(en)(2) groups are bonded to the Re cluster through Cu-N(cyanide) bonds. In compound 1, which contains a tetrahedral cluster core, the Cu(en)(2) groups are necessarily bonded to cis cyano groups; in compound 2, which has an octahedral cluster core, they are bonded to trans cyano groups. Compound 1 crystallizes in the monoclinic space group C2/c with four formulas in unit cell of dimensions a = 18.9077(10), b = 15.4841(8), c = 14.4483(8) A, beta = 95.124(1) degrees, and V = 4213.1(4) A(3) (T = 153 K); compound 2 crystallizes in the triclinic space group P1 with one formula in a unit cell of dimensions a = 9.4906(3), b = 10.6529(4), c = 12. 6252(5) A, alpha = 113.599(1) degrees, beta = 103.404(1) degrees, gamma = 92.659(1) degrees, and V = 1123.87(7) A(3) (T = 153 K).
authors.affiliation: Institute of Inorganic Chemistry, 3 Acad. Lavrentiev Prosp., 630090, Novosibirsk, Russia.
authors.forename: Y V
authors.initials: YV
authors.lastname: Mironov
authors.forename: V E
authors.initials: VE
authors.lastname: Fedorov
authors.forename: I
authors.initials: I
authors.lastname: Ijjaali
authors.forename: J A
authors.initials: JA
authors.lastname: Ibers