"Twisted" intramolecular charge-transfer states in supercooled molecules: structural effects and clustering with polar molecules

Abstract

with our experimental value of 0.044 is therefore undoubtedly fortuitous, but clearly the calculation tends to support a much lower yield than the 0.18-0.19 values usually employed. A new absolute determination of the quantum yield is strongly suggested by these studies.

Supersonic jet studies of solvation effects on the spectroscopy and photophysics of 4-diethylaminopyridine

“…This finding is in contrast with the spectral features of the clusters of 4-diethylaminopyrimidine with water (1 : 1) or methanol (1 : 1 and 1 : 2), which show structured R2PI spectra shifted to the red with respect to the monomer origin of 149 cm À1 or 163 cm À1 and 331 cm À1 , respectively. 2,44 3.1.1 Bare chromophore. The 0 0 0 region of DEAP shows a pattern of low-frequency vibrations (Fig.…”

LIF excitation spectra of o- and m-cyanoanilines

“…Inversion motions in the amino group have been studied for many aniline derivatives. 8,10,[18][19][20][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Inversion motions in fluoroanilines and aminopyridines were modeled by Gordon and by other workers. 23,26,36 Analysis of LIF excitation spectra of 4-hydroxyaniline has been presented by Wategaonkar and Doraiswamy 24 and of 4-methylaniline by Powers et al 10 Becucci et al [31][32][33] investigated potential energy surfaces for harmonic motions and inversion motions of the amino group in 4-fluoroaniline in the ground S 0 and singlet excited S 1 states using ab initio HF and CIS quantum mechanical calculations.…”

“…38 The large geometrical transformation of the excited 4-cyano-N-dimethylaniline molecule has attracted much attention in the field of electronic spectroscopy and photochemistry. 22,25,27,39 Spectroscopy of the vacuum isolated 4-cyano-N-dimethylaniline and related molecules has been reviewed by Phillips. 22 LIF excitation spectra and dispersed fluorescence of the 3-cyano and 4-cyanoanilines were investigated by Philips and coworkers.…”

The Solvatofluorochromism of 2,4,6‐Triarylpyrimidine Derivatives

“…in their detailed study of the emission spectra of some triarylpyrimidines , we assigned the more intense, fluorosolvatochromic emission band with the lower‐energy absorption to a normal ICT process. The higher‐energy band at 331 nm in DMSO possibly originated from a TICT process . A detailed confirmation of this hypothesis in all employed solvents was, however, beyond the scope of the present work.…”

“…By varying the pyrimidine acceptor group A, the conjugating linkage π , or the donor group D, the solvatofluorochromic properties of these dyes can be widely varied. Examples of such variations include the direct linking between a pyrimidine ring and an amino group , conjugation of a pyridimidine system with a methoxyphenyl group , with an aminophenyl group linked through an ethylene bridge or through an arylene , or heteroarylene spacer .…”