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

Abstract The hydrogen-bonded systems formed between 5-bromo-isophthalic and trimesic acid derivatives and the trinuclear arene-ruthenium cluster cation [H 3 Ru 3 (C 6 H 6 )(C 6 Me 6 ) 2 (O)] + ( 1 ) 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 [ 1 ][BF 4 ] shows a 1:1 (acid:cluster) supramolecular system, only one hydroxyl of the acid functions interacting with the μ 3 -oxo ligand of a cation of 1 , 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 μ 3 -oxo ligand of two independent cations of 1 , while the remaining hydroxyl group of the third acid function interacts with a tetrafluoroborate anion.