A Novel 3D Framework Coordination Polymer based on Succinato bridged Helical Chains Connected by 4, 4' ‐ Bipyridine: [Cu(bpy)(H 2 O) 2 (C 4 H 4 O 4 )]?2H 2 O

Blue needle—shaped crystals of [Cu(bpy)(H 2 O) 2 (C 4 H 4 O 4 )]· 2H 2 O were obtained by slow evaporation of a methanolic aqueous solution containing a fresh Cu(C 4 H 4 O 4 )· 2H 2 O precipitate, 4, 4′—bipyridine, and ammonia. Within the complex, the six—coordinated Cu atoms are linked by bis—monodentate gauche succinate anions into chains propagating helically around the [001] axis. The chains are interconnected by 4, 4′—bipyridine ligands into a 3D framework with the crystal H 2 O molecules located in the channels along the [100], [010] and [110] directions. The Cu 2+ ions are in distorted octahedral coordination of two nitrogen and four oxygen atoms (equatorial bonds: Cu—N 1.986(5), 2.015(5)Å; Cu—O 1.950(6), 1.954(6)Å; axial bonds Cu—O: 2.524(9), 2.539(8)Å). Furthermore, the thermal and magnetic behavior of the compound will be discussed. Crystal data: hexagonal, P 6 1 (no. 169), a = 11.066(2)Å, c = 24.965(5)Å, V = 2647.5(8)Å 3 , Z = 6, R = 0.0528 and wR 2 = 0.1103 for 1426 observed reflections ( F o 2 > 2σ( F o 2 )) out of 2170 unique reflections.