76008-29-2Relevant academic research and scientific papers
Rotation mobility of the guest molecules and its reactivity in the thermal reaction in the solid matrix
Minaylov,Vorobiev,Gurman
, p. 97 - 101 (1994)
Characteristic times of the thermal reaction and the molecular rotation for the guest molecules have been measured in polystyrene films. Rotation mobility of molecules was determined from the relaxation of the light induced optical anisotropy of the photoselected samples. Close agreement of the activation energies and characteristic times of thermal reaction and molecular rotation was observed. By the comparison of the induced optical anisotropy of the initial and photoconverted molecules the angles of the rotation of the molecular dipole transition moment in the instant of the elementary act of the photochemical conversion were determined.
Photochemical Valence Isomerization of 9-alkyl-substituted Anthracenes to 9,10-Dewarisomers.
Jahn,Dreeskamp
, p. 42 - 47 (2007/10/02)
On light absorption in the long wavelength **1L//a-band 9-alkyl-substituted anthracenes in fluid solutions isomerize with low quantum yield (about 0. 016 at 300 K) to the 9,10-Dewarisomer, provided the substituent is sufficiently spacefilling (t-butyl or t-pentyl). On increasing the viscosity and/or reducing the temperature the quantum yield of this valence isomerization decreases while the quantum yield of fluorescence and the vibrational structure of the fluorescence emission increases. From spectroscopic, caloric and kinetic data an energy diagram of the ground and first excited states is constructed for this photo- and thermoreversible reaction in which the folding along the 9,10-axis of the anthracene sceleton serves as the main reaction coordinate.
