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Ultrasonic velocity, conductivity, viscosity and calorimetric studies of copper(I) and sodium perchlorates in cyanobenzene, pyridine and cyanomethane
Journal article   Peer reviewed

Ultrasonic velocity, conductivity, viscosity and calorimetric studies of copper(I) and sodium perchlorates in cyanobenzene, pyridine and cyanomethane

D.S. Gill, P. Singh, J. Singh, P. Singh, G. Senanayake and G.T. Hefter
Journal of the Chemical Society, Faraday Transactions, Vol.91, pp.2789-2795
1995
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Abstract

Ultrasonic velocities (u), densities (), viscosities (), molar conductivities () and enthalpies of solution (solH) of CuClO4 and NaClO4 have been measured in cyanobenzene, pyridine and cyanomethane at 298, 308 and 318 K. These data have been used to calculate isentropic compressibilities (s) of the salts and limiting ionic conductivities (oi), solvated ionic radii (ri) and solvation numbers (n) for Cu+, Na+ and ClO4–. Cu+ is highly solvated in all three solvents with solvation decreasing in the order pyridine > cyanomethane > cyanobenzene. Na+ in all solvents is relatively less solvated and the solvation decreases in the order cyanomethane ? cyanobenzene ? pyridine. The ClO4– ion is poorly solvated in all three solvents. s and solHo data indicate that NaClO4, in spite of its poor solvation in pyridine, shows strong structural effects which are attributed to strong pyridine–pyridine interactions.

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