Synthesis and crystal structure of bi(ethylenediamine) copper tetracyanonickelate (II)

The crystal structure of the title compound C8H16CuN8Ni has been determined by single crystal X-ray diffraction. The crystal is triclinic with space group P1, a = 6.494(3), b = 7.270(4), c = 7.936(5) Angstrom, alpha = 106.67(3), beta = 91.33(4), gamma = 106.80 (6)degrees, V = 341.3(3) Angstrom(3), Z = 1, M-r = 346.54, F (000) = 117, mu = 2.933mm(-1), D-c = 1.686 Mg/m(3). The final R factor is 0.0603 for 1214 unique observed reflections [I greater than or equal to 2 sigma(I)]. The structure consists of [Cu(en)(2)](2+) (en = ethylenediamine) cations and [Ni(CN)(4)](2-) anions linked together by two of the CN groups (the remaining two act as unidentate ligands) to form infinite chains, in the chain, the hydrogen bonds of N(4)... H-N(5) exist,with distance 3.148 Angstrom, at the same time the hydrogen bonds of N(4)... H-N(7a) and N(5)-H ... N(1a) (a: x-1, y-1, z-1) between the interchains also exist, with distances of 3.160 and 3.124 Angstrom, so it forms a three-dimensional structure of the title compound.