Vithana, Vidushi P., Guo, Zhifang, Deacon, Glen B., and Junk, Peter C. (2024) Rare Earth 2-Methyl-3-furoate Complexes: Effect of Steric Hindrance on Corrosion Inhibitor Properties. European Journal of Inorganic Chemistry, 27. e202300722.

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Abstract

The preparation and characterization of six rare earth 2-methyl-3-furoate (2m3fur) complexes are detailed in this study. Analysis through single-crystal X-ray diffraction, as well as powder XRD, reveals that all six compounds belong to one of two structural groups: {[RE2(2m3fur)6(EtOH)] ⋅ H2O}n (RE=La, Ce, Pr) and [RE3(2m3fur)9]n (RE=Y, Er, Yb). These structural groups feature carboxylate coordinated linear polymers. The former complexes have two distinct metal centers, one ten coordinate and one nine, with lattice water participating in a hydrogen bond with coordinated ethanol. The latter structures, involving erbium, ytterbium, and yttrium, have three unique metal centers: two eight coordinate, and one seven-coordinated. In corrosion inhibition tests on mild steel in 0.01 M NaCl solution, the maximum efficiency was observed with [Y3(2m3fur)9]n at 59 %, which is less effective than yttrium 3-furoate (90 % efficiency). The results suggest that the steric effect of the methyl group adversely affects corrosion inhibition.

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