Four Novel Oxomolybdenum-Organodiphosphonate Hybrids in the Presence of Cu(II)–Organonitrogen Building Blocks: Synthesis, Crystal Structures, and Surface Photovoltage Properties

Four novel organic–inorganic hybrid materials of the copper(II)–molybdophosphonate family, [Cu(1,10-phen)Mo2O5(H2O)(hedp)] (1), [{Cu(1,10-phen)}{Cu(1,10-phen)(H2O)}MoO2(hedpH)2]·H2O (2), [Cu(1,10-phen)Mo0.5O(hedpH)] (3), and [{Cu(2,2′-bipy)(H2O)}MoO2(hedp)]·2H2O (4) (hedpH4 = 1-hydroxyethylidenediphosphonate, 2,2′-bipy = 2,2′-bipyridine, 1,10-phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions. In compound 1, the interconnection of {MoO6}, {CuN2O2}, and {CPO3} polyhedra leads to a 2D layer through edge-sharing and corner-sharing, and such layers are further assembled into a 3D supramolecular structure by π–π stacking interactions. Compound 2 contains a 1D chain built up from {MoO6}, {CuN2O3}, and {CPO3} polyhedra, and then these 1D chains are further extended into 2D supramolecular layer by hydrogen bonding interactions. Such neighboring layers are further assembled into a 3D supramolecular structure via the π–π stacking interactions. For compound 3, the [{Cu(1,10-phen)}2MoO2(...