Preparation and Characterization of Pure Thiosulfuric Acid. Issue 12 (6th June 2018)

• Record Type: Journal Article
• Authors: Hopfinger, Mathias; Zischka, Florian; Seifert, Mathias; Kornath, Andreas J.
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 644:Issue 12/13(2018)
• Page Start: 574
• Page End: 579
• Publication Date: 2018-06-06
• Subjects: Acids -- DFT calculations -- NMR spectroscopy -- Vibrational spectroscopy -- Thiosulfuric acid; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201800105
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract : Pure thiosulfuric acid has not been prepared yet, although it is described in most textbooks of inorganic chemistry. Furthermore, no experimental evidence for the structure of thiosulfuric acid is known. Theoretical calculations predict the (SH)(OH) tautomer to be more stable than the (OH)(OH) tautomer. In this work we present the synthesis and spectroscopical characterization of pure thiosulfuric acid. X 2 S2 O3 ( X = H, D) was obtained from the reaction of dry Na2 S2 O3 with anhydrous HF at –60 °C. The experimental vibrational and NMR spectra together with quantum chemical calculations provide evidence for the predicted (SH)(OH) tautomeric structure. Abstract : Does pure thiosulfuric acid exist and what it is structure? This question is answered for the first time experimentally. The spectroscopic characterization shows that the acid exists exclusively in the predicted (SH)(OH) tautomeric form (1).