mu-4,4 '-Bipyridine-kappa N-2:N '-bis[tetraaqua(4,4 '-bipyridine-kappa N)dimanganese(II)] bis(4-aminobenzoate) bis(perchlorate)-4,4 '-bipyridine-water (1/2/4): a supramolecular system constructed by pi-pi and hydrogen-bond interactions

作者：Wang Jun; Gao Junlin^*; Zhao Wenhua

来源：Acta Crystallographica Section C-Crystal Structure Communications, 2012, 68: M255-+.

DOI：10.1107/S0108270112033616

The title dinuclear manganese compound, [Mn2(C10H8N2)3(H2O)8](C7H6NO2)2(ClO4)2 center dot 2C10H8N2 center dot 4H2O, (I), has an inversion center located midway between the MnII ions. Each MnII ion has a distorted octahedral coordination environment, defined by two mutually cis N atoms from two different 4,4'-bipyridine (4,4'-bipy) ligands and four O atoms from four water molecules. The asymmetric unit contains cationic [Mn(4,4'-bipy)1.5(H2O)4]2+, one isolated 4,4'-bipy molecule, one 4-aminobenzoate ion, one disordered perchlorate ion and two uncoordinated water molecules. In the dinuclear manganese cationic unit, one 4,4'-bipy acts as a bidentate bridging ligand between two MnII ions, while the other two act only as monodentate terminal ligands, giving rise to a `Z-type' [Mn2(4,4'-bipy)3(H2O)8] host unit. These host units are linked to each other via face-to-face pi-pi stacking interactions between monodentate terminal 4,4'-bipy ligands, generating a zigzag chain. The corners of these chains, defined by Mn(OH)4 units, are surrounded by the solvent water molecules and the carboxylate O atoms of the 4-aminobenzoate ions, and all of these are connected to each other via strong O-H center dot center dot center dot O hydrogen-bond interactions, leading to a three-dimensional grid network with a large cavity running along the b axis of the unit cell. The isolated 4,4'-bipy molecules, the 4-aminobenzoate and perchlorate anions and the water molecules are encapsulated in the cavities by numerous hydrogen-bond interactions.

• 出版日期2012-9