Raman spectroscopic determination of the dissociation constants of an acetonitrile–zinc complex in aqueous solution and the enthalpy and entropy of complex dissociation | Zendy

Edwards H. G. M. | Zendy; Hoskins A. R. | Zendy; Johnson A. F. | Zendy; Lewis I. R. | Zendy

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Raman spectroscopic determination of the dissociation constants of an acetonitrile–zinc complex in aqueous solution and the enthalpy and entropy of complex dissociation

Author(s) -

Edwards H. G. M.,

Hoskins A. R.,

Johnson A. F.,

Lewis I. R.

Publication year - 1991

Publication title -

journal of raman spectroscopy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.748

H-Index - 110

eISSN - 1097-4555

pISSN - 0377-0486

DOI - 10.1002/jrs.1250221110

Subject(s) - acetonitrile , chemistry , aqueous solution , zinc , raman spectroscopy , enthalpy , dissociation (chemistry) , dissociation constant , inorganic chemistry , analytical chemistry (journal) , organic chemistry , thermodynamics , biochemistry , physics , receptor , optics

The dissociation constants for an acetonitrile‐zinc complex, (CH 3 CN)Zn 2+ , were measured in aqueous solutions containing zinc salts (40‐80%, w/w) and acetonitrile by Raman spectroscopy. Quantitative measurements of the intensity of the free and complexed ν(CN) Raman bands at 2264 and 2320 cm −1 , respectively, were used to determine the average enthalpy and entropy of the complex dissociation to free acetonitrile in the temperature range 293‐343 K for a 70% (w/w) solution of zinc chloride (0.052 mol) in an aqueous solution containing acetonitrile (0.024 mol); δ H ° and δ S ° values of 8.4 ± 0.5 kJ mol −1 , respectively, were determined.

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