Hydrothermal syntheses, characterizations and crystal structures of three new cadmium (II) amino-diphosphonates: effects of substitute groups on the structures of metal phosphonates
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Hydrothermal reactions of cadmium(II) chloride with three amino-diphosphonic acids, C6H5CH2N(CH 2PO3H2)2 (H4L 1), C6H5CH2CH2N(CH 2PO3H2)2 (H4L 2) and 4-CH3-C6H4CH2N (CH2PO3H2)2) (H4L 3) resulted in three new metal amino-diphosphonates, namely, Cd(H3L1)2, 1 Cd(H3L 2)22H2O 2 and Cd(H3L 3)2 3. In all three complexes, the Cd(II) ion is octahedrally coordinated by six phosphonate oxygen atoms from six ligands. Complexes 1 and 3 have a similar structure in which the CdO6 octahedra are cross-linked by bridging ligands into a double chain along the c-axis, such double chains are further interlinked via hydrogen bonds between non-coordinated phosphonate oxygen atoms to form 100 and 200 layers with the phenyl groups of the ligands orientated toward the interlayer space. The structure of complex 2 features a 100 cadmium(II) diphosphonate layer. The effects of the substitute groups attached to the amine groups on the structures of the metal phosphonates are also discussed. 2003 Elsevier Inc. All rights reserved.
