Issue 27, 2025

Polynuclear tantalum(v) coordination complexes: from dinuclear {Ta2O} to octanuclear {Ta8O12} oxo species connected through aryl monotopic carboxylate linkers

Abstract

A series of monocarboxylic ligands (benzoic acid, 1-naphtoic acid, 2-naphtoic acid, antracene-9-carboxylic acid and 4′-methylbiphenyl-4-carboxylic acid) has been used to react upon mild heating with the pentavalent ethoxide tantalum(V) precursor Ta(OEt)5 in isopropanol solvent. Five new molecular coordination compounds were isolated from crystallization upon cooling of the reactant's mixtures at room temperature. The different systems crystallized in dimeric {Ta2O} (compound 1 and 2), tetrameric {Ta4O4} (compound 3 and 4) or octameric {Ta8O12} (compound 5) metal-oxo units stabilized by a combination of monocarboxylic ligands and isopropanolate solvent molecules. The five molecular samples were characterized in solid state by single-crystal and powder X-ray diffraction analyses, infrared spectroscopy, scanning electron microscopy (SEM) and thermogravimetric (TG) analysis. The chemical properties of compounds 1 & 5 have been tested for the catalytic conversion of dihydroxyacetone, showing Brønsted acidity.

Graphical abstract: Polynuclear tantalum(v) coordination complexes: from dinuclear {Ta2O} to octanuclear {Ta8O12} oxo species connected through aryl monotopic carboxylate linkers

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr 2025
Accepted
01 Jun 2025
First published
05 Jun 2025
This article is Open Access
Creative Commons BY-NC license

CrystEngComm, 2025,27, 4734-4743

Polynuclear tantalum(V) coordination complexes: from dinuclear {Ta2O} to octanuclear {Ta8O12} oxo species connected through aryl monotopic carboxylate linkers

A. V. Huerta, M. B. Ahmed, N. Essayem, L. Djakovitch, A. Mesbah, T. Loiseau and S. Duval, CrystEngComm, 2025, 27, 4734 DOI: 10.1039/D5CE00444F

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