Preferential solvation and molecular orbital calculation studies of solvatochromic mesoionic 2,3-diaryl-2H-tetrazolium-5-thiolate derivatives
作者:A. Taha、A. Mageed Kiwan
DOI:10.1039/b008263p
日期:——
Solvent effects on the electronic spectra of some mesoionic 2,3-diaryl-2H-tetrazolium-5-thiolate derivatives were investigated in thirteen pure solvents and eight water–organic solvent mixtures. In pure solvents, the solvatochromic
shifts of the mesoionic compounds are found to be mainly influenced by the AN, α and π* solvent parameters.
The relative contributions of these parameters depend on the nature of the substituents on the phenyl moieties
of the mesoionic derivatives. Thus, electron-donating substituents increase the relative contribution of both AN and α parameters but decrease the relative contribution of the π* parameter. The behavior of the mesoionic
derivatives in water–organic solvent mixtures has been explained in terms of preferential solvation. Different criteria were considered to evaluate the extent of preferential solvation in different solvent mixtures, iz. the excess function (Δν), iso-solvation point (Xiso) and preferential solvation constant (K). Three distinct preferential solvation patterns
for the mesoionic derivatives in different water–organic solvent mixtures were elucidated: negative deviation
in water–alcohol and water–Py, positive deviation in water–Me2CO and water–DMF, and a dual behavior in water–MeCN and water–Diox solvent mixtures. Molecular orbital calculations have been carried out for the mesoionic derivatives and the data correlated with the experimental results.
HUTTON, A. T.;IRVING, H. M. N. H., J. CHEM. SOC. PERKIN TRANS., 1982, N 9, 1117-1121
作者:HUTTON, A. T.、IRVING, H. M. N. H.
DOI:——
日期:——
Synthesis of 2,3-Diaryltetrazole-5-thiones and Theoretical Studies on Atomic Charge Distributions of 2,3-Diphenyltetrazole-5-thione
作者:Fangfang Jian、Pusu Zhao、Lan Zhang、Yuxia Hou
DOI:10.1021/jo0504767
日期:2005.10.1
Four 2,3-diaryltetrazole-5-thiones have been synthesized in high yields using a new synthetic method under mild reaction conditions. Theoretical calculations of the structure, vibrational frequencies, and natural population analysis (NPA) of atomic chargedistributions on 2,3-diphenyltetrazole-5-thione 1 have been performed by DFT-B3LYP, HF, and MP2 methods using several basis sets. According to the