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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.