Coordination polymers of dicyanamide and methylpyrazine: Syntheses, structures, and magnetic properties

Abstract

The crystal structures of M(dca)2(Mepyz)2· H2O, M = Co (1), Ni (2), dca = dicyanamide, N(CN)2-, and Mepyz = methylpyrazine; [Mn(dca)2(Mepyz) 2][Mn(dca)2(Mepyz)]2·2MeCN (3); and Mn2(dca)3(NO3)(Mepyz)2 (4) are reported. Compounds 1 and 2 are isomorphous and consist of two-dimensional (2D) (4,4) sheets, with bridging μ1,5-dca ligands and trans-disposed monodentate Mepyz ligands. Compounds 3 and 4 were obtained as an intimate mixture from the same reaction mixture. Compound 3 contains both one-dimensional (1D) chains, in which Mn atoms are bridged by double μ1,5-dca bridges and the Mepyz ligands are trans and monodentate, and 2D (4,4) sheets, in which similar 1D chains are connected by bridging ..