TICT Molecules

Structural Changes Accompanying Intramolecular Electron Transfer: Focus on Twisted Intramolecular Charge-Transfer States and Structures

“…A comprehensive review appeared on the molecular jet spectroscopy of the TICT molecules and their van der Waals complexes with polar molecules. Special attention was paid to distinguishing the CT and the excimer emissions.…”

Synthesis of Bismaleimides Bearing Electron-Donating Chromophores and Their Fluorescence Behavior during Copolymerization

“…The conformations of energy minimum of the para and meso series were calculated by a semiempirical (AM1) method using a Gaussian98 program, showing that the twisted or dihedral angles between A (=) and D (*) for m -BMPO (28.20°) and m -BIPO (29.5°) are larger than those of p -BMPO (23.9°) and p -BIPO (27.7°). A large twisted angle between A (=) and D (*) favors the occurrence of charge separate state, 9d-f which leads to more obvious intramolecular quenching for meso series.…”

“…Copolymerization Monitoring. Recently, fluorescence spectroscopy as a significant tool has been developed for the in situ, on-line monitoring of polymerization, cross-linking, or curing. ,− The most of information on polymerization was indirectly obtained from the changes in microenvironment such as reduced free volume, polarity, viscosity, etc. ,9c,24b Therefore, this often leads to some unsatisfactory reports on polymerization: 20 (1) The fluorescence behavior of probe is no sensitive to the polymerization at the early stage, where almost no changes occur in surrounding media. (2) At the gel effect and/or vitrification stage, the fluorescent signals are grossly magnified due to the dramatically environmental changes.…”

“…On the other hand, recently, there has been an increasing interest in the development of the on-line monitoring of polymerization, cross-linking or curing by means of fluorescence spectroscopic techniques . Most of the work was performed through the use of a small amount of fluorophore added as a probe to monitor polymerization process, which was the so-called fluorescence probe technique. , Although the current fluorescence probe technique can provide some useful and referential information on the process of polymerization, it does not give direct information on the conversion of CC bond during polymerization. In this study, on the basis of the fluorescence behavior of A (=) −D (*) −A (=) monomers, we attempt to develop a new approach toward the fluorescence monitoring of polymerization or cure reaction.…”

Fotoquímica de sistemas Areno/Olefina

“…[15][16][17][18][19][20][21][22] Las áreas de estudio actuales en las que las reacciones de TE juegan un papel clave son varias. [23][24][25][26][27][28][29][30] Cabe destacar la química supramolecular de complejos organometálicos orientada al estudio de la fotosíntesis, 31,32 la fotoquímica del ADN, 33,34 el estudio de la conversión/almacenamiento de la energía solar 35 y las aplicaciones en síntesis orgánica. [36][37][38] Asímismo, se ha dedicado gran atención al estudio de los procesos fotofísicos básicos que rigen la TE fotoinducida.…”