Structure of tetrakis(-acetato-5?O:?O')-bis(2-cyano-?N-guanidine)dicopper(II)

[Cu 2 (C 2 H 3 O 2 ) 4 (C 2 H 4 N 4 ) 2 ], M r =531.19, monoclinic, P2 1 /n (non-standard setting of P2 1 /c), a=8.416 (2), b=15.4?3 (5), c=8.679 (3) A, β=110.08 (5) o , V=1058.06 A 3 , Z=2, D m =1.65, D x =1.67 g cm -3 , λ(Mo Kα)=0.71073 A, μ=21.46 cm -1 , F(000)=540, T=295 K, R=0.039 for 152 least-squares parameters and 1725 unique reflections with I>3σ(I). The centrosymmetric molecular structure of [Cu(OAc) 2 (cnge)] 2 (OAc=acetate; cnge=2-cyanoguanidine) comprises a tetrakis(acetato)-bridged dinuclear copper(II) core with axially located cnge moieties