Uncompensated Spin Magnetic Moment and Properties of Coordination Bond M ← OH2 in Isostructural Nitrilo-tris-Methylenephosphonate Complexes [MII(H2O)3μ-NH(CH2PO3H)3] (MII = Cr–Zn)


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The parameters of coordination bonds M ← OH2 (the magnetic moments of transition metals, interatomic distances, force constants, and break energies) in isostructural nitrilo-tris-methylenephosphonate complexes of transition metals of 3d-series [MII(H2O)3μ–NH(CH2PO3H)3] (MII = Cr–Zn) are analyzed. It is shown that the correlation of force constants with interatomic distances is in good agreement with the Badger rule, and the break energy of bond M ← OH2 deviates strongly from the empirical Poling dependence. It is shown that deviations of the break energy of bond M ← OH2 from the Poling rule are due to the presence of an uncompensated spin density at the central atom. This explains the stability of Fe-containing heterometallic coordination polymers [(Fe,M)(H2O)3μ–NH(CH2PO3H)3], which determines the high efficiency of nitrilo-tris-methylenephosphonate complexes as inhibitors of the corrosion of steel in aqueous media.

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N. Lomova

Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: natalomkell@yandex.ru
俄罗斯联邦, Izhevsk, 426067

F. Chausov

Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences

Email: natalomkell@yandex.ru
俄罗斯联邦, Izhevsk, 426067

V. Petrov

Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences

Email: natalomkell@yandex.ru
俄罗斯联邦, Izhevsk, 426067

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