Abstract
Nitrilotris(methylenephosphonato)triaquacobaltum(II) and tetrasodium nitrilotris(methylenephosphonato)cobaltate(II) tridecahydrate were synthesized and studied. The crystals of [Co(H2O)3{NH(CH2PO3H)3}] (I) are monoclinic, space group P21/c, Z = 4, a = 9.2092(2), b = 16.0540(2), c = 9.7445(2) Å, β = 115.778(3)°. The coordination polyhedron of cobalt is a distorted octahedron formed by oxygen atoms. The organophosphorus ligand bridges the neighboring cobalt atoms. The crystals of Na4[Co{N(CH2PO3)3}] · 13H2O (II) are triclinic, space group, P \(\overline 1 \), Z = 2, a = 11.2240(8), b = 11.2663(8), c = 12.3296(8) Å, α = 108.513(6)°, β = 97.261(6)°, γ = 117.056(7)°. The cobalt atom is coordinated to form a distorted trigonal bipyramid. Complex II is a chelate in which the cobalt atom closes three five-membered N-C-P-O-Co rings sharing the Co-N bond. The Co atom is incorporated in the Co-O-Co-O ring. Upon dissolution in water, this ring is opened and cobalt(II) atom is hydrolyzed.
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Original Russian Text © N.V. Somov, F.F. Chausov, R.M. Zakirova, I.V. Fedotova, 2015, published in Koordinatsionnaya Khimiya, 2015, Vol. 41, No. 12, pp. 729–735.
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Somov, N.V., Chausov, F.F., Zakirova, R.M. et al. Synthesis and structure of cobalt(II) complexes with nitrilotris(methylenephosphonic) acid [Co(H2O)3{NH(CH2PO3H)3}] and Na4[Co{N(CH2PO3)3}] ·13H2O. Russ J Coord Chem 41, 798–804 (2015). https://doi.org/10.1134/S1070328415110081
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DOI: https://doi.org/10.1134/S1070328415110081