Bimetallic sheet and 3D threefold interpenetrating diamond-like network constructed by chelate Cu cations and Mn dicyanamide polymeric chains. Synthesis, crystal structure, and magnetism of [Cu(L)2][Mn(dca)4] (L=ethylenediamine or 1,3-diaminopropane; dca=

Two novel bimetallic coordination polymers, [Cu(en)2][Mn(dca)4] (1) and [Cu(pn)2][Mn(dca)4] (2) (en, ethylenediamine; pn, 1,3-diaminopropane; dca, dicyanamide N(CN)2−), have been synthesized and characterized. Both of them consist of Mndca anionic chains and chelate cations of copper. 1 has a sheet like architecture built by the [Cu(en)2]2+ cations and the homoleptic trans-[Mn(dca)4 2−]n chains. 2 shows unusual 3-D threefold interpenetrating diamond-like structure constructed by [Cu(pn)2]2+ cations and the homoleptic cis-[Mn(dca)4 2−]n chains. The magnetic susceptibilities obey the Curie–Weiss law with weak antiferromagnetic interactions.