Synthesis, structure, and properties of nickel complexes with nitrilotris(methylenephosphonic acid) [Ni(H2O)3N(CH2PO3H)3] and Na4[Ni(H2O)N(CH2PO3)3] a™ 11H2O

Nitrilotris(methylenephosphonato)triaquanickel and tetrasodium nitrilotris(methylenephosphonato) aquanickelate undecahydrate were synthesized and characterized. The crystal of [Ni(H2O)(3)N(CH2PO3H)(3)] is composed of linear coordination polymers and belongs to sp. gr. P2(1)/c, Z = 4, a = 9.17120(10) , b = 16.05700(10) , c = 9.70890(10) , beta = 115.830(2)A degrees. The Ni atom is in an octahedral coordination formed by two oxygen atoms of one phosphonate ligand, one oxygen atom of another ligand molecule, and three water molecules in a meridional configuration. The crystal of Na-4[Ni(H2O)N(CH2PO3)(3)] a (TM) 11H(2)O has an island dimeric chelate structure and belongs to sp. gr. D2/c, Z = 8, a = 18.7152(2) , b = 12.05510(10) , c = 21.1266(2) , beta = 104.4960(10)A degrees. The Ni atom has a slightly distorted octahedral coordination involving one nitrogen atom and closes three five-membered N-C-P-O-Ni rings sharing the Ni-N bond.