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Cyanide- and fumarate-bridged bimetallic complex, poly[μ-fumaratotetraaminedizinc(II)di-μ-cyanodicyanonickel(II) dihydrate], {[Zn 2 (μ-fum)(NH 3 ) 4 Ni(μ-CN) 2 (CN) 2 ]·2H 2 O} n  ( 1 ) (H 2 fum = Fumaric acid) was synthesized and structurally characterized by vibrational (FT-IR and Raman) spectroscopy, single crystal X-ray diffraction and elemental and thermal analyses techniques. The structure of the complex consists of a one-dimensional polymeric chain, in which the Zn(II) and Ni(II) ions are linked by CN groups. The Ni(II) ion is four coordinated with four cyanide-carbon atoms in a square planar arrangement and the Zn(II) ions are four coordinated with one cyanide nitrogen atom, two amine nitrogen atoms and one fumarate oxygen atom, in a distorted tetrahedral arrangement. In the complex, the adjacent chains are connected by strong O–H···O, O–H···N, N–H···O and N–H···N hydrogen bonding interactions to form a three dimensional network.

One-dimensional cyanide- and fumarate-bridged heteronuclear complex, poly[μ-fumaratotetraaminedizinc(II)di-μ-cyanodicyanonickel(II) dihydrate]