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Three-, Two-, and One-Dimensional Metal Phosphonates Based on [Hydroxy(4-pyridyl)methyl]phosphonate:  M{(4-C5H4N)CH(OH)PO3}(H2O) (M = Ni, Cd) and Gd{(4-C5H4N)CH(OH)P(OH)O2}3·6H2O

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journal contribution
posted on 2005-05-16, 00:00 authored by Deng-Ke Cao, Yi-Zhi Li, You Song, Li-Min Zheng
Based on the [hydroxy(4-pyridyl)methyl]phosphonate ligand, three compounds with formula Ni{(4-C5H4N)CH(OH)PO3}(H2O) (1), Cd{(4-C5H4N)CH(OH)PO3}(H2O) (2), and Gd{(4-C5H4N)CH(OH)P(OH)O2}3·6H2O (3) have been synthesized under hydrothermal conditions. The crystal data for 1 are as follows:  orthorhombic, space group Pbca, a = 8.7980(13) Å, b = 10.1982(15) Å, and c = 17.945(3) Å. For 2 the crystal data are as follows:  monoclinic, space group C2/c, a = 23.344(6) Å, b = 5.2745(14) Å, c = 16.571(4) Å, and β = 121.576(4)°. The crystal data for 3 are as follows:  rhombohedral, space group R3̄, a = 22.2714(16) Å, b = 22.2714(16) Å, and c = 9.8838(11) Å. Compound 1 adopts a three-dimensional pillared layered structure in which the inorganic layers made up of corner-sharing {NiO5N} octahedra and {CPO3} tetrahedra are connected by pyridyl groups. A two-dimensional layer structure is found in compound 2, which contains alternating inorganic double chains and pyridyl rings. Compound 3 has a one-dimensional chain structure where the Gd atoms are triply bridged by O−P−O linkages. The pyridyl nitrogen atom in 3 remains uncoordinated and is involved in the interchain hydrogen bonds. Magnetic susceptibility studies of 1 and 3 reveal that weak ferromagnetic interactions are mediated between Ni(II) centers in compound 1. For compound 3, the behavior is principally paramagnetic.

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