Synthesis and structures of rare earth 3-(4 '-Methylbenzoyl)-propanoate complexes: new corrosion inhibitors

de Bruin-Dickason, Caspar N.;Deacon, Glen B.;Forsyth, Craig M.;Hanf, Schirin;Heilmann, Oliver B.;Hinton, Bruce R.W.;Junk, Peter;Somers, Anthony E.;Tan, Yu Qing;Turner, David R.

Peter Junk

Abstract

A series of rare earth 3-(4'-methylbenzoyl)propanoate (mbp(-)) complexes [RE(mbp)(3)(H2O)] (RE = rare earth = Y, La, Ce, Nd, Ho, Er) have been prepared by either metathesis reactions between the corresponding rare earth chloride and Na(mbp) or protolysis of rare earth acetates by the free acid. Single-crystal X-ray diffraction studies of [RE(mbp)(3)(H2O)] (RE = Ce, Nd) and [Ce(mbp)(3)(dmso)] reveal a 1D carboxylate-bridged polymeric structure in the solid state, featuring 9-coordinate rare earth ions. X-ray powder diffraction patterns of the bulk materials indicates that all of the [RE(mbp)(3)(H2O)] complexes except RE = La are isomorphous. Hence, there is no structural change from the complex with RE = Ce to that with RE = Er despite the lanthanoid contraction. The H-1 NMR spectra of the RE = Ho or Er complexes in (CD3)(2)SO show large paramagnetic shifts and broadening of the CH2 resonances, indicating the retention of substantial carboxylate coordination in solution.

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Australian Journal of Chemistry

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1445-0038

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CSIRO Publishing

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DOI

10.1071/CH16547