Abstract
A sodium salt of samarium nitrilotris(methylenephosphonate) complex [Na(H2O)6]2[SmH{μ7-N(CH2PO3)3}2Na6(H2O)10] · 6H2O has been synthesized, isolated, and studied. Crystals are monoclinic, space group P21/c, Z = 2, a = 11.8046(2) A, b = 10.5454(2) A, c = 19.8116(3) A, and β = 94.2790(10)°. The Sm atom is coordinated to two acid residues {N(CH2PO3)3} bound to each other through six P–O–Na–O–P bridges. The Sm coordination polyhedron is a rhombohedron elongated along the N–Sm–N axis. The Sm–O bond length (2.379(10) A) is 0.615(12) A smaller than Sm–N (2.9944(19) A), which is explained by back donation of Sm–O bonds and generation of an increased electron density region in the vicinity of the Sm atom.
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