Preparation and Structures of Rare Earth 3-Benzoylpropanoates and 3-Phenylpropanoates

Abstract

Rare earth (RE) complexes of 3-benzoylpropanoate (bp), [RE(bp)3(H2O)n] (RE=La, n=2; RE=Y, Ce, Pr, Nd, Yb, n=1) and 3-phenylpropanoate (pp), [RE(pp)3] (RE=Y, La, Ce, Nd, Yb), have been prepared by metathesis reactions between the corresponding rare earth chloride and the appropriate sodium carboxylate. Analysis by single-crystal X-ray diffraction finds that both RE bp and pp complexes favour formation of carboxylate-bridged 1-D coordination polymers in the solid state. Here, the former favours heteroleptic 9 or 10-coordinate complexes (splitting between Ce and La) with the carbonyl remaining uncoordinated but participating as a hydrogen bond acceptor with water in the coordination sphere. Lack of bp carbonyl coordination leaves this group available for surface interactions during corrosion inhibition and complex solubilization. The latter pp derivatives form eight-coordinate complexes for Y and Yb and are the first examples of homoleptic RE pp complexes to be reported.

Rare Earth 2‐Methyl‐3‐furoate Complexes: Effect of Steric Hindrance on Corrosion Inhibitor Properties

“…Rare earth carboxylates constitute the largest class of rare earth-based coordination polymers, [1] showcasing diverse structural types and coordination modes. [2][3][4][5] These complexes are known for their high coordination numbers, achieved through the favourable large size and high charge of lanthanoid ions, the multiplicity of carboxylate binding modes, and the lack of directionality in lanthanoid-carboxylate binding. [2] Over the past two decades, the combination of the properties of rare earth ions and aromatic carboxylates has given rise to the development of highly effective dual-function rare earth carboxylate corrosion inhibitors.…”

“…[2][3][4][5] These complexes are known for their high coordination numbers, achieved through the favourable large size and high charge of lanthanoid ions, the multiplicity of carboxylate binding modes, and the lack of directionality in lanthanoid-carboxylate binding. [2] Over the past two decades, the combination of the properties of rare earth ions and aromatic carboxylates has given rise to the development of highly effective dual-function rare earth carboxylate corrosion inhibitors. These compounds have emerged as a promising and greener alternative to toxic chromates in the field of corrosion prevention.…”

“…Rare earth carboxylates constitute the largest class of rare earth‐based coordination polymers, [1] showcasing diverse structural types and coordination modes [2–5] . These complexes are known for their high coordination numbers, achieved through the favourable large size and high charge of lanthanoid ions, the multiplicity of carboxylate binding modes, and the lack of directionality in lanthanoid‐carboxylate binding [2] …”