X-ray crystallographic study of hydrogen-bonded systems formed between di- and tricarboxylic acids and the trinuclear cluster cation [H₃Ru₃(C₆H₆)(C₆Me₆)₂ (O)]⁺

The hydrogen-bonded systems formed between 5-bromo-isophthalic and trimesic acid derivatives and the trinuclear arene-ruthenium cluster cation [H₃Ru₃(C₆H₆)(C₆Me₆)₂ (O)]⁺ (<b>1</b>) have been studied in the solid state by single-crystal X-ray structure analysis of the tetrafluoroborate salts. The structure analysis of 5-bromo-isophthalic acid with [<b>1</b>][BF₄] shows a 1:1 (acid:cluster) supramolecular system, only one hydroxyl of the acid functions interacting with the μ₃-oxo ligand of a cation of <b>1</b>, the hydroxyl group of the second acid function interacting with a tetrafluoroborate anion. With trimesic acid, a 1:2 (acid:cluster) supramolecular system is formed. Two hydroxyl groups interact with the μ₃-oxo ligand of two independent cations of <b>1</b>, while the remaining hydroxyl group of the third acid function interacts with a tetrafluoroborate anion.