Bis(hexaaquasodium) Bis(nitrilo(tris(methylenephosphonato))decaaquamonohydrogenhexasodiumsamarate Hexahydrate [Na(H2O)6]2[SmH{μ7-N(CH2PO3)3}2Na6(H2O)10] · 6H2O: Synthesis, Structure, and Nature of Coordination Bond

• Published in: Russian journal of inorganic chemistry Vol. 65; no. 6; pp. 854 - 863
• Main Authors: Chausov, F. F., Somov, N. V., Lomova, N. V., Zakirova, R. M., Shumilova, M. A., Zhirov, D. K., Petrov, V. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-06-2020; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Coordination; Coordination Compounds; Electron density; Inorganic Chemistry; Samarium; Sodium salts; nitrilotris(methylenephosphonate) complex; samarium; thermogravimetry; X-ray single-crystal diffraction; Raman spectroscopy; IR spectroscopy; X-ray photoelectron spectroscopy
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023620060030

A sodium salt of samarium nitrilotris(methylenephosphonate) complex [Na(H
2
O)
6
]
2
[SmH{μ
7
-N(CH
2
PO
3
)
3
}
2
Na
6
(H
2
O)
10
] · 6H
2
O has been synthesized, isolated, and studied. Crystals are monoclinic, space group
P
2
1
/
c
,
Z
= 2,
a
= 11.8046(2) Å,
b
= 10.5454(2) Å,
c
= 19.8116(3) Å, and β = 94.2790(10)°. The Sm atom is coordinated to two acid residues {N(CH
2
PO
3
)
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) Å) is 0.615(12) Å smaller than Sm–N (2.9944(19) Å), 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.