Abstract
Abstract Two new uranyl diphosphonates, namely, [UO2(H3L1)2(H2O)]·4H2O (1) and [UO2(H3L2)(H2O)]·3H2O (2), H4L1 = PyNHCH(PO3H2)2, H5L2 = Py(COOH)NHCH(PO3H2)2, have been hydrothermally synthesized from the reactions of two diphosphonate ligands with uranyl nitrate hexahydrate and characterized systematically using powder and single-crystal X-ray diffraction, IR, EA, TGA and fluorescent emission measurements. The proton transfer from the phosphonic acid groups to the pyridine and imine groups leads to the formation of zwitterionic ligands. The diphosphonate ligand in compound 1 adopts chelate coordination mode resulting in molecular structure while displays chelate-bridging coordination mode in compound 2 leading to the formation of 1D infinite chain structure. The fluorescent properties of compounds 1 and 2 were also investigated.
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