SYNTHESIS AND STRUCTURE OF TETRASODIUM ITRILОTRISMETHYLENEPHOSPHONATO ZINCATE TRIDECAHYDRATE Na4[ZnN(CH2PO3)3]·13H2O, A CORROSION INHIBITOR
F. F. Chausov1, E. A. Naimushina1, I. N. Shabanova2, N. V. Somov3
1Udmurt State University, Izhevsk, Russia
2Institute of Physics and Technology, Ural Branch, Russian Academy of Sciences, Izhevsk, Russia
3Lobachevsky State University of Nizhni Novgorod, Nizhni Novgorod, Russia
Keywords: corrosion inhibitor, coordination compounds, zinc, organophosphonate complex, nitrilоtrismethylenephosphonate, intramolecular coordination, chelate complexes
Abstract
Organophosphonate zincate corrosion inhibitor (CCDC 919565) contains the Zn-N bond closing three five-membered chelate rings with the formation of a common bonding electronic subsystem of N-Zn-O-P atoms. Zinc is coordinated in a distorted trigonal bipyramidal configuration involving the oxygen atom of the neighboring molecule of the complex. Space group P1(-), Z = 2, a = 11.2208(2) Å, b = 11.2666(3) Å, c = 12.3286(3) Å, α = 108.455(2)°, β = 97.168(2)°, γ = 117.103(2)°. The inhibitor does not form polymeric structures, provides the stability and reproducibility of technological quality parameters. The initial decomposition temperature is 250 °C. The corrosion inhibition factor is 14.3 (GOST 9.502-82, steel grade 20, medium No. 2, static conditions, natural aeration, 10 days exposure).
DOI: http://dx.doi.org/10.1134/S0022476615030270
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