A series of organic-inorganic hybrid materials consisting of flexible organic amine modified polyoxomolybdates: synthesis, structures and properties

A series of organic-inorganic hybrid complexes based on different types of polyoxomolybdates and transition metal complexes, namely, [Zn-2(TPMA)(2)(H2P2Mo5O23)]center dot 11H(2)O (1), [Zn-2(TPMA)(2)(Mo8O26)] (2), [Co-2(TPMA)(2)(Mo8O26)] (3), [Ni-2(TPMA)(2)(Mo8O26)(H2O)(2)] (4), [Ni-2(TPMA)(2)(2-PA)(H2O)](PMo12O40) (5) [Cu-2(TPMA)(2)(Mo8O26)] (6), 2[Cu(TPMA)(CrMo6(OH)(6)O-18)]center dot H[Cu-2(TPMA)(2)(CrMo6(OH)(6)O-18)]center dot 4H(2)O (7) (TPMA = Tris[(2-pyridyl) methyl] amine, 2-PA = 2-picolinic acid), have been successfully synthesized under hydrothermal conditions. All complexes were characterized by single-crystal X-ray structural analysis, powder X-ray diffraction, IR spectroscopy and TG analysis. All the complexes showed polyoxomolybdate-based zero-dimensional (0D) structures, and could be further extended into three-dimensional (3D) supramolecular frameworks through hydrogen bonding interactions. In addition, the electrochemical properties of complexes 1-7 have been investigated. Interestingly, some complexes have efficient photocatalytic activities to degradate pararosaniline hydrochloride dye molecules.