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, and Turner, David R. (2017) Synthesis and structures of rare earth 3-(4 '-Methylbenzoyl)-propanoate complexes: new corrosion inhibitors. Australian Journal of Chemistry, 70 (5). pp. 478-484.

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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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