Abstract
Dipole moments of pyridine and γ-picoline complexes with I2 in a number of nonpolar and weakly polar solvents were determined and the contributions of the dative structure FN in the ground state were estimated. The results are consistent with those calculated from the force constants of stretching vibrations v(N-l) and v (I-I). A good correlation of FN was found with respect to the solvent shift of the transition energy {ie355-1} in the I2 molecule bounded to amines and also to empirical parameters of solvent activities like rate constants of the Menshutkin reaction or the Dimroth-Reichardt parameter. No correlation exists between the solvent induced enhancement of the dipole moment and dielectric permittivity in terms of the Onsager reaction field theory.
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Pawełka, Z., Sobczyk, L. Effect of solvents on dielectric, spectroscopic and thermodynamic manifestations of intermolecular interactions. Iodine complexes of pyridine and picoline. J Solution Chem 12, 355–367 (1983). https://doi.org/10.1007/BF01150444
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DOI: https://doi.org/10.1007/BF01150444