Correlation between the M←OH2 Bond Force Constants, Energies, and Lengths and Magnetic Moments of the Metal Atoms in Isostructural Nitrilotris(methylenephosphonic) Complexes [MII(H2O)3μ-NH(CH2PO3H)3] (MII = Cr-Zn)

• Published in: Russian journal of inorganic chemistry Vol. 64; no. 4; pp. 465 - 471
• Main Authors: Chausov, F. F., Lomova, N. V., Petrov, V. G.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-04-2019; Springer Nature B.V
• Subjects: Aqueous solutions; Bond energy; Chemical bonds; Chemical compounds; Chemistry; Chemistry and Materials Science; Chromium; Coordination Compounds; Correlation analysis; Corrosion inhibitors; Empirical analysis; Ferrous alloys; Inorganic Chemistry; Iron; Magnetic moments; Magnetism; Organic chemistry; Photoelectrons; Raman spectroscopy; Regression analysis; Spectrum analysis; Thermogravimetric analysis; Transition metal compounds; X ray photoelectron spectroscopy; X-ray diffraction; Zinc; thermogravimetry; X-ray diffraction; coordination bond; Raman spectroscopy; X-ray photoelectron spectroscopy; transition metals
• ISSN: 0036-0236; 1531-8613
• DOI: 10.1134/S0036023619040065

The isostructural 3
d
transition metal complexes [M
II
(H
2
O)
3
μ-NH(CH
2
PO
3
H)
3
] (M
II
= Cr-Zn) were studied by X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. In order to gain more in-depth knowledge about the chemical bonds in coordination compounds, correlation analysis was carried out between the force constants and energies of the M←OH
2
coordination bonds and the magnetic moments of transition metal atoms. The correlation of the force constants of the M←OH
2
bonds with the
M-O(w)
interatomic distances was in line with the known empirical Badger’s rule. The double linear regression between the bond energy and reciprocal of M-O
(w)
interatomic distances and atomic magnetic moments shows a close relationship between the M←OH
2
bond energy and the spin magnetic moment of 3
d
-metal atoms. The results account for the stability of Fe-containing heterometallic polymeric NTP complexes and high efficiency of NTP complexes as corrosion inhibitors for iron alloys in aqueous media.