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RESEARCH ARTICLE
Contents Vol 70(5)

Synthesis and Structures of Rare Earth 3-(4′-Methylbenzoyl)-propanoate Complexes – New Corrosion Inhibitors*

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

A School of Chemistry, Monash University, Clayton, Vic. 3800, Australia.

B Institute for Frontier Materials, Deakin University, Geelong, Vic. 3220, Australia.

C College of Science and Engineering, James Cook University, Townsville, Qld 4811, Australia.

D Corresponding authors. Email: glen.deacon@monash.edu; peter.junk@jcu.edu.au

Australian Journal of Chemistry 70(5) 478-484 https://doi.org/10.1071/CH16547
Submitted: 29 September 2016  Accepted: 17 October 2016   Published: 15 November 2016

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 1H NMR spectra of the RE = Ho or Er complexes in (CD3)2SO show large paramagnetic shifts and broadening of the CH2 resonances, indicating the retention of substantial carboxylate coordination in solution.


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