| Popis: |
Some N′-2-(substituted pyridyl)-N-substituted thiourea (in all 12-substituted pyridyl thioureas) have been examined in ultraviolet region in a series of solvents covering a broad polarity range i. e. from benzene (Z, 54.0) to ethylene glycol (Z, 85.1). Transition energies and oscillator strengths have been calculated and transition energy (ET) has been plotted against Z-values, a new-empirical measurement of solvent polarity. A linear relationship was observed between the transition energy and Z-value for pyridyl μμ* and thiocarbonyl μμ* transitions. The effect of substituent present in pyridyl group on λmax of a compound in the same solvent has been studied. Solvent sensitivites of these ligands have also been calculated. |
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