A New Two-dimensional Coordination Polymer Based on Trinuelear Manganese Clusters

A novel two-dimensional Mn(II) coordination polymer, [Mn-3(L)(2)(cis-chdc)(2)(trans-chdc)]n (L = 2-amino-4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenol and chdc = 1,4-cyclo-hexanedicarboxylate), has been hydrothermally synthesized and characterized by elemental analysis, IR, TG, PL and single-crystal X-ray diffraction. Crystallographic data for this compound: monoclinic space group P2/n with a = 11.0058(13), b = 9.0179(11), c = 28.431(3) angstrom, beta = 92.850(2)degrees, V= 2818.3(6) angstrom(3), Z = 2, C62H56Mn3N10O14, M-r = 1329.99, D-c = 1.567 g/cm(3), F(000) = 1370, mu(MoK alpha) = 0.742 mm(-1), R = 0.0553 and wR = 0.1421. The chdc carboxylates bridge the Mn(II) atoms to form a trinuclear Mn(II) cluster. The cis-chdc ligands are held together by the trinuclear Mn(II) clusters to result in a chain structure. Further, the trans-chdc ligands link adjacent chains to furnish a two-dimensional network. The pi-pi interactions between neighboring layers link the adjacent layers into a three-dimensional supramolecular architecture. Moreover, the N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds further stabilize the 3D supramolecular architecture.