Ion association and solvation of thiocyanates in water–dimethylformamide mixtures: an ultrasonic study

Autor:	Hiroyasu Nomura, Shinobu Koda, Katsuyuki Matsumoto, Riichi Nishimura
Rok vydání:	1991
Předmět:	chemistry.chemical_compound chemistry Stability constants of complexes Solvation Analytical chemistry Ionic bonding Relaxation (physics) Dimethylformamide Ultrasonic sensor Partial molar property Physical and Theoretical Chemistry Ion-association
Zdroj:	J. Chem. Soc., Faraday Trans.. 87:287-291
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9918700287
Popis:	Ultrasonic relaxation spectra of LiNCS and NH4NCS in water–DMF mixtures have been measured in the frequency range 1–700 MHz. No ultrasonic relaxation of NH4NCS in DMF was observed in this range. Ultrasonic relaxation for LiNCS solutions was observed at concentrations >60 mol% in DMF and was ascribed to ion-pair formation, expressed by the Eigen mechanism. The difference in ultrasonic relaxation spectra of LiNCS and NH4NCS solutions is discussed with respect to their different solvation properties. This information was obtained from the partial molar volume and adiabatic compressibility. The kinetic parameters and the adiabatic volume change due to the ionic association process for LiNCS in DMF are estimated using the formation constant obtained by analysis of the Raman bands.
Databáze:	OpenAIRE
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