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Transformation from a Low-Dimensional Framework to a High-Dimensional Architecture Based on Different Metal Ions:  Syntheses, Structures, and Photoluminescences

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posted on 26.06.2006 by Yun Gong, Wang Tang, Wenbin Hou, Zhongyong Zha, Changwen Hu
Five novel metal pamidronates (3-ammonium-1-hydroxypropylidene-1,1-bisphosphonate, APD) formulated as Ni2(C3NH10P2O7)4·4H2O (1), M(C3NH9P2O7)·H2O (M = Co (2), Mn (3), Zn (4)) and Cu3(C3NH8P2O7)2·2H2O (5) have been hydrothermally synthesized under similar conditions. Compound 1 is a molecular binuclear nickel cluster. Compounds 2 and 3 exhibit similar one-dimensional ladderlike structures. Compound 4 possesses a novel two-dimensional gridlike framework. Compound 5 shows an unusual three-dimensional architecture, in which two-dimensional layers with a parquet motif are pillared by {CuO4} planar squares. Different dinuclear secondary building units (SBUs) are observed in compounds 15, depending on the different coordination modes of APD. They also exhibit different photoluminescence properties.