Complex formation between [(η6-p-cymene)Ru(H2O)3]2+ and hydroxycarboxylates or their sulfur analogues - The role of thiolate groups in metal ion binding

Dániel Hüse, Linda Bírõ, János Patalenszki, Attila Csaba Bényei, Péter Buglyõ

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The interactions between [(η6-p-cymene)Ru(H2O)3]2+ and L-malic acid (H2mal), L-tartaric acid (H2tart), and their sulfur-containing analogues dl-thiomalic acid (H3thiomal) and meso-2,3-dimercaptosuccinic acid (H4dmsa) were studied by pH potentiometry, NMR spectroscopy, and ESI-MS. The hydroxycarboxylates are potent metal ion binders and prevent hydrolysis at pH 7.4 in aqueous solution. Although H2mal forms mononuclear complexes with different degrees of protonation by the involvement of the alcohol/alkoxide group in addition to the carboxylate groups, the presence of binding isomers is detected for the H2tart system. The replacement of the alcohol group by a thiolate group results in the formation of dinuclear [Ru2A2] complexes as the single species over a wide pH range. Complexes with identical binding modes with H3thiomal or polymeric species with H4dmsa are identified, and the X-ray structure of [{(η6-p-cym)Ru}2(Hthiomal)2] is reported. The stereochemistry of the chiral-at-metal complexes was explored by NMR spectroscopy and is also discussed.

Original languageEnglish
Pages (from-to)5204-5216
Number of pages13
JournalEuropean Journal of Inorganic Chemistry
Volume2014
Issue number30
DOIs
Publication statusPublished - Oct 2014

Keywords

  • Carboxylate ligands
  • Chirality
  • Half-sandwich complexes
  • Ruthenium
  • S ligands
  • Stability constants

ASJC Scopus subject areas

  • Inorganic Chemistry

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