Chelate complexes of lead(II) with nitrilotris(methylenephosphonic) acid [Pb{mu(5)-NH(CH2PO3H)(3)}] and Na-4[Pb-2(H2O)(2){mu(3)-N(CH2PO3)(3)H-2}(2)] center dot 10H(2)O: Synthesis, structure, and asymmetry of lone 6s pair

摘要

Two complexes of Pb(II) with nitrilotris(methylenephosphonic) acid are synthesized and their crystal structures are determined. Nitrilotris(methylenephosphonato)lead(II) [Pb{mu(5)-NH(CH2PO3H)(3)}] is a coordination 3D polymer; space group PA , Z = 2. The coordination polyhedron of Pb is a distorted pentagonal bipyramid with the N atom at one of the equatorial positions. Tetrasodium bis[aquanitrilotris(methylenephosphonatoplumbate( II)] decahydrate Na-4[Pb-2(H2O)(2){mu(3)-N(CH2PO3)(3)H-2}(2)] center dot 10H(2)O crystallizes in space group PA , Z = 2. The degree of asymmetry of the coordination polyhedra of lead atoms characterizing the localization of the lone 6s electron pair is estimated.