Chelate complexes of lead(II) with nitrilotris(methylenephosphonic) acid [Pb{μ5-NH(CH2PO3H)3}] and Na4[Pb2(H2O)2{μ3-N(CH2PO3)3H2}2] · 10H2O: Synthesis, structure, and asymmetry of lone 6s pair

Two complexes of Pb(II) with nitrilotris(methylenephosphonic) acid are synthesized and their crystal structures are determined. Nitrilotris(methylenephosphonato)lead(II) [Pb{μ 5 -NH(CH 2 PO 3 H) 3 }] is a coordination 3D polymer; space group P ī, 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 (H 2 O) 2 {μ 3 -N(CH 2 PO 3 ) 3 H 2 } 2 ] · 10H 2 O crystallizes in space group P ī, Z = 2. The degree of asymmetry of the coordination polyhedra of lead atoms characterizing the localization of the lone 6 s electron pair is estimated.