Transition metal phosphonates with supramolecular structures: syntheses, structures, surface photovoltage and luminescence propertiesElectronic supplementary information (ESI) available. CCDC 1043125–1043128. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5nj02417j

Four new transition metal phosphonates with 2D and 3D supramolecular structures, namely [Cu2(1,10-phen)2(HL)2(L)]·H2L (1), [Zn(1,10-phen)(HL)2] (2), [M(1,10-phen)(HL)2(H2L)] (M = Mn (3), and Cd (4)) (H2L = phenylphosphonic acid, 1,10-phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions. In compound 1, two {CuN2O3} square pyramids and three {CPO3} tetrahedra are interconnected through phosphonate oxygen atoms to form a cluster unit viaedge- and corner-sharing. Neighboring units are further assembled into a 3D supramolecular structure through π–π stacking and hydrogen bonding interactions. For compound 2, two {ZnO3N2} square pyramids and four {CPO3} tetrahedra are interconnected by phosphonate oxygen atoms to a cluster unit viacorner-sharing. Then the adjacent clusters are further assembled into a 3D supramolecular structure through π–π stacking interactions. Compounds 3and 4are isomorphous and adopt a 2D supramolecular structure. The interconnection of {MO4N2} and {CPO3} polyhedra leads to a cluster unit through corner-sharing, and such units are further assembled into a 2D supramolecular structure by π–π stacking and hydrogen bonding interactions. The surface photovoltage properties of compounds 1and 3and luminescence properties of compounds 2and 4have been studied. The surface photovoltage spectra (SPS) and field-induced surface photovoltage spectra (FISPS) of compounds 1and 3indicate that they all possess certain photo-electric conversion properties and show p-type semiconductor characteristics. Luminescence properties of compounds 2and 4indicate that they may be candidates for potential luminescent materials. [ABSTRACT FROM AUTHOR]

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