metal-organic compounds
The title dinuclear manganese compound, [Mn2(C10H8N2)3(H2O)8](C7H6NO2)2(ClO4)2·2C10H8N2·4H2O, (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 - 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-HO 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.
metal-organic compounds
In the mixed-ligand metal–organic title polymeric compound, [Zn(C10H8O4)(C10H16N6)]n or [Zn(PBEA)(BTH)]n [H2PBEA is benzene-1,4-diacetic acid and BTH is 1,6-bis(1,2,4-triazol-1-yl)hexane], the asymmetric unit contains a ZnII atom, one half of a BTH ligand and one half of a doubly deprotonated H2PBEA ligand. Each ZnII centre lies on a crystallographic twofold rotation axis and is four-coordinated by two O atoms from two distinct PBEA2− ligands and two N atoms from two different BTH ligands in a {ZnO2N2} coordination environment. The three-dimensional topology of the title compound corresponds to that of a fivefold interpenetrating diamond-like metal–organic framework.