Amino Diphosphonic Acid Metal Complexes Synthesis, Structure And Characterization

Metal phosphonates with novel open-framework or microporous structures are of current research interests to inorganic and materials chemists due to their potential applications in catalysis, ion exchange reagents, proton conductor, intercalation chemistry, optimistic chemistry, materials chemistry and so on.It has been the hot research aera that designing novel funtional material by modifying the phosphonate ligands through introducing other functional groups such as carboxyl, hydroxyl, amino and crown ether. In this thesis we have synthesized two amino diphosphonates, with which three main group metal phosphonates and three transition metal phosphonates have been synthesized and their crystal structures have been determined by X-ray diffraction method, Infrared spectroscopy, elemental analysis have been employed to confirm their structures. We have also studied their thermal stability, fluorescence and magnetic properties. The results are outlined as follows:(1) Two ligands have been synthesized: 1-aminoethylidenediphonic acid (CH₃C(NH₂)(PO₃H₂)₂)=L1) and 3-amino-1-hydroxyl-propylidenediphsphonic acid (NH₂CH₂CH₂C(OH)(PO₃H₂)₂=L2). Then three main group and three transition metal (II) phosphonates have been synthesized. Their formulas are as follows: Ca[CH₃C(NH₃)(PO₃H)₂]₂[CH₃C(NH₃)(PO₃H)(PO₃H₂)]₂(1), Sr{[CH₃C(NH₃)(PO₃H)(PO₃)](H₂O)}H₂O,Pb[CH₃C(NH₃)(PO₃H)(PO₃)]H₂O(3), Co₂(NH₃CH₂CH₂C(OH)(PO₃)(PO₃H))₂·2H₂O(4),Cu₃[NH₃CH₂CH₂C(OH)(PO₃)₂]-2(H₂O)₂(5) andCu[NH₃CH₂CH₂C(OH)(PO₃)(PO₃H)]H₂O(6).(2) The structures of the above Complexes have been determined. Complex 1 has a pseudo one dimensional chain structure. The two neigbouring Ca(II) are linked by a pair of O-P-O bridges in the chain, and such chains are interlinked by hydrogen bonds, forming three dimensional supramolecular network structure. Both complex 2 and 3 have layered structures, which are further linked to three-dimensional structures by hydrogen bonds. Complex 4 features one dimensional ladder-like double chain structure, where the dimmer units {Co₂(μ-O)₂} are connected by O-P-O bridges. The chains are interconnected via hydrogen bonds into a 3D network. Complex 5 has a complicated three-dimensional structure, in which there are two kinds of Cu atoms. One kind of Cu atoms are six coordinated which are in centers of the dreich octahedra...