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

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 1−5, depending on the different coordination modes of APD. They also exhibit different
photoluminescence properties.