Organic Thiosulfates (Bunte Salts): Novel Surface-Active Sulfur Compounds for the Preparation of Self-Assembled Monolayers on Gold
| Autor: | K. Laajalehto, and Mia Lindström, Jouko Kankare, Minna Meretoja, Ilkka Kartio, Jukka Lukkari, Markku Rajamäki |
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| Rok vydání: | 1999 |
| Předmět: |
Thiosulfate
chemistry.chemical_classification Inorganic chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Sulfur Bunte salt chemistry.chemical_compound Thiosulfates chemistry Sulfite Chemisorption Polymer chemistry Electrochemistry Moiety General Materials Science Spectroscopy Alkyl |
| Zdroj: | Langmuir. 15:3529-3537 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la9811719 |
| Popis: | In this paper, we demonstrate that organic thiosulfates (Bunte salts) with the general formula R−SSO3M, where R is either an aliphatic or aromatic group and M a monovalent cation, constitute a novel class of surface-active compounds with a sulfur-containing headgroup. Bunte salts form self-assembled monolayers (SAMs) on gold under anaerobic conditions and chemisorb forming a Au−S bond, in which the chemical nature of sulfur is indistinguishable by X-ray photoelectron spectroscopy (XPS) from gold thiolate formed upon chemisorption of thiols and disulfides. The S−SO3 bond in the thiosulfate is cleaved during adsorption on the gold surface and the sulfite moiety is released. We have prepared one alkyl thiosulfate (sodium S-dodecylthiosulfate, C12SSO3Na) and two aromatic redox-active thiosulfates (potassium S-(2,5-dihydroxyphenyl)thiosulfate, QSSO3K, and dipotassium S,S‘-(3,6-dihydroxy-1,2-phenylene)bisthiosulfate, Q(SSO3K)2) and compared the formation and properties of the SAMs prepared from these Bunte salt... |
| Databáze: | OpenAIRE |
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