Analyse des spectres de vibration de l’acide 3,3′-thiodipropionique et de ses sels alcalins

✍ Scribed by H. Ramsis; A. Ennaciri; J. L. Delarbre; L. Maury

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 332 KB
• Volume: 29
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199804)29:4<331::aid-jrs236>3.0.co;2-k

✦ Synopsis

The Raman and infrared spectra of 3,3º-thiodipropionic acid and its potassium salts in aqueous solution were recorded from 4000 to 200 cm-1. An assignment of the fundamental vibrations is proposed. Analysis of the polarization of the Raman lines indicated that the acid, the acid salt and the neutral salt belong to the symmetry C s group. On the basis of the intermolecular hydrogen bond present in the crystalline state of the acid salts, the potassium and sodium 3,3º-thiodipropionate acids can be classiÐed as type A and B structures, respectively, according to Speakman.

Les spectres Raman et infrarouge de lÏacide 3,3º-thiodipropionique et de ses sels de potassium en solution aqueuse ont e te enregistre s entre 4000 et 200 cm-1. Une attribution des vibrations fondamentales est propose e. LÏanalyse de lÏe tat de polarisation des raies Raman montre que les trois compose s (lÏacide, le sel acide et le sel neutre) appartiennent au groupe de syme trie A lÏe tat cristallin, la liaison hydroge`ne intermole culaire pre sente C s . dans les sels acides montre que les 3,3º-thiodipropionates acid de potassium et de sodium sont respectivement de type A et B selon la classiÐcation de Speakman.