Abstract
Investigation of Solvent‐Solute Interactions of 1‐Benzylidenepyrazolidone (3) ‐betaines by I.R. SpectroscopyThe infrared spectra of eight 1‐benzylidenepyrazolidone(3)‐betaines (1–7 and 3 m) have been measured in 22 solvents of different polarity. The carbonyl band of these compounds indicates specific and non‐specific solvent‐solute interactions, which are qualitatively characterized by the electrophilic properties of the solvent (E‐value, acceptor number AN). Intermolecular hydrogen bonds have been detected in protic solvents. The thermodynamic quantities of the associate equilibrium, K,ΔRH,ΔRS were determined in chloroform and deuterochloroform, respectively, by the i.r. intensity method.
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