Water-soluble calix[6]arenes. Characterization of 5,11,17,23,29,35-hexasulphonate-37,38,39,40,41,42-hexahydroxycalix[6]arene and thermodynamic study of proton complex formation
1995; Elsevier BV; Volume: 264; Linguagem: Inglês
10.1016/0040-6031(95)02383-d
ISSN1872-762X
AutoresGiuseppe Arena, Annalinda Contino, Gaetano G. Lombardo, Domenico Sciotto,
Tópico(s)Supramolecular Chemistry and Complexes
ResumoThe title compound, synthesized by modifying the procedure described in literature, was characterized by NMR, IR, TG, LSIMS, ICP-AES and potentiometry, and found to be an octasodium salt. Its protonation constants were determined in aqueous solution at 25°C and I = 0.1 mol dm−3 (NaNO3) and compared with literature data determined under similar conditions. Enthalpy and entropy values, determined calorimetrically under the same experimental conditions employed for the potentiometric measurements, together with NMR results, provide a detailed picture of the processes taking place in aqueous solution.
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