Syntheses, Structures, and Corrosion Inhibition of Various Alkali Metal Carboxylate Complexes

Vithana, Vidushi P., Guo, Zhifang, Deacon, Glen B., and Junk, Peter C. (2023) Syntheses, Structures, and Corrosion Inhibition of Various Alkali Metal Carboxylate Complexes. Molecules, 28 (14). 5515.

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Complexes of the alkali metals Li-Cs with 3-thiophenecarboxylate (3tpc), 2-methyl-3-furoate (2m3fur), 3-furoate (3fur), 4-hydroxycinnamate (4hocin), and 4-hydroxybenzoate (4hob) ions were prepared via neutralisation reactions, and the structures of [Li2(3tpc)2]n (1Li); [K2(3tpc)2]n (1K); [Rb(3tpc)(H2O)]n (1Rb); [Cs{H(3tpc)2}]n (1Cs); [Li2(2m3fur)2(H2O)3] (2Li); [K2(2m3fur)2(H2O)]n (2K); [Li(3fur)]n(3Li); [K(4hocin](H2O)3]n (4K); [Rb{H(4hocin)2}]n.nH2O (4Rb); [Cs(4hocin)(H2O)]n (4Cs); [Li(4hob)]n (5Li); [K(4hob)(H2O)3]n (5K); [Rb(4hob)(H2O)]n (5Rb); and [Cs(4hob)(H2O)]n (5Cs) were determined via X-ray crystallography. Bulk products were also characterised via XPD, IR, and TGA measurements. No sodium derivatives could be obtained as crystallographically suitable single crystals. All were obtained as coordination polymers with a wide variety of carboxylate-binding modes, except for dinuclear 2Li. Under conditions that normally gave coordinated carboxylate ions, the ligation of hydrogen dicarboxylate ions was observed in 1Cs and 4Rb, with short H-bonds and short O…O distances associated with the acidic hydrogen. The alkali-metal carboxylates showed corrosion inhibitor properties inferior to those of the corresponding rare-earth carboxylates.

Item ID: 80348
Item Type: Article (Research - C1)
ISSN: 1420-3049
Keywords: 2-methyl-3-furoate, 3-furoate, 3-thiophenecarboxylate, 4-hydroxybenzoate, 4-hydroxycinnamate, alkali metal, carboxylate complexes, corrosion inhibitors, structures
Copyright Information: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Funders: Australian Research Council (ARC)
Projects and Grants: ARC grant DP200100568
Date Deposited: 25 Sep 2023 23:54
FoR Codes: 34 CHEMICAL SCIENCES > 3402 Inorganic chemistry > 340209 Organometallic chemistry @ 100%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280105 Expanding knowledge in the chemical sciences @ 100%
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