Abstract
Tetra- and pentasodium salts of nitrilotris(methylenephosphonic acid) N(CH2PO3)3H6 (NTP) have been studied by single-crystal X-ray diffraction and spectroscopy. [Na8(H2O)12{NH(CH2PO3)3H}2] · H2O crystallizes in triclinic system, space group P1, Z = 1, a = 7.1515(2) A, b = 11.1590(3) A, c = 12.0583(3) A; α = 92.077(2)°, β = 106.145(2)°, γ = 5.628(2)°, CCDC No. 1432091. The crystal structure comprises two-dimensional layers lying along planes (011), where dimeric molecules are linked by bridges each comprising four Na hydration octahedra. The [Na5(H2O)11{NH(CH2PO3)3}] · 2H2O crystals are monoclinic, space group P21/n, Z = 4, a = 6.3024(2) A, b = 21.5639(7) A, c = 18.1608(6) A; β = 91.261(3)°, CCDC No. 1497161. The crystal packing comprises alternating layers in planes [020] made of two-dimensional nets of Na hydration polyhedra, and columns of Na hydration octahedra lying in planes [040], with acid moieties in between.
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