We propose a simple model to interpret the optical absorption spectra of porphyrin in different solvents. Our model successfully explains the decrease in the intensity of optical absorption at maxima of increased wavelengths. We also prove the dependence of the intensity and peak positions in the absorption spectra on the environment. The nature of the Soret band is supposed to derive from π plasmon. Our theoretical calculations are consistent with previous experimental studies.
We theoretically investigate physical properties of the pressure-induced activation volume and dynamic decoupling of ternidazole, glycerol, and probucol by the Elastically Collective Nonlinear Langevin Equation theory. Based on the predicted temperature dependence of activated relaxation under various compression, the activation volume is determined to characterize effects of pressure on molecular dynamics of materials. We find that the decoupling of the structural relaxation time of compressed systems from their bulk uncompressed value is governed by the power-law rule. The decoupling exponent exponentially grows with pressure below 2 GPa. The decoupling exponent and activation volume are intercorrelated and have a connection with the differential activation free energy. We numerically and mathematically analyze relationships among these quantities to explain many results in previous experiments and simulations.
Physical properties of the pressure-induced activation volume and dynamic decoupling of ternidazole, glycerol, and probucol by the elastically collective nonlinear Langevin equation theory is theoretically investigated. Based on the predicted temperature dependence of activated relaxation under various compressions, the activation volume is determined to characterize effects of pressure on molecular dynamics of materials. It is found that the decoupling of the structural relaxation time of compressed systems from their bulk uncompressed value is governed by the power-law rule. The decoupling exponent exponentially grows with pressure below 2 GPa. The decoupling exponent and activation volume are intercorrelated and have a connection with the differential activation free energy. Relationships among these quantities are analyzed numerically and mathematically to explain many results in previous experiments and simulations.
In this paper, we report the synthesis of four new 1,1’‐diphenyl‐2‐thienyl‐2’‐(4‐substituted‐styryl) ethenes via one‐step oxidative Heck coupling reaction of 1,1’‐diphenyl‐2,2’‐dithienylethene (DPDTE). This is a useful method to alkenylate DPDTE in order to enhance its fluorescence as well as its aggregation‐induced emission (AIE) properties. 1,1’‐Diphenyl‐2‐thienyl‐2’‐(4‐methylstyryl)ethene showed low fluorescent intensity in CHCl3 solution but very high AIE intensities. On the other hand, 1,1’‐diphenyl‐2‐thienyl‐2’‐(4‐acetoxystyryl)ethene showed both high fluorescence in CHCl3 solution and AIE intensities.
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