S. Murphy et Gb. Schuster, ELECTRONIC RELAXATION IN A SERIES OF CYANINE DYES - EVIDENCE FOR ELECTRONIC AND STERIC CONTROL OF THE ROTATIONAL RATE, Journal of physical chemistry, 99(21), 1995, pp. 8516-8518
The photophysical properties of a series of substituted indocarbocyani
ne dyes was examined by fluorescence and time-resolved absorption spec
troscopy. The excited singlet-state lifetimes vary with the identity o
f the substitutent. The lifetime is controlled primarily by rotation a
bout a carbon-carbon bond. The substituents affect this process in sev
eral ways.