Surface-assisted transient displacement charge technique. I. Photoinduced charge transfer in self-assembled monolayers.
Surface-assisted photoinduced transient displacement charge (SPTDC) technique was developed in order to study light-induced charge transfer in surface-bound molecules and applied to investigation of self-assembled monolayers of 7-diethylaminocoumarin and 2,4-dinitrophenylamine. The dipole moment change measured by SPTDC correlates reasonably well with that measured in solution by standard PTDC technique and with semiempirical calculations. Shortening of the excited-state lifetime of surface-immobilized coumarin due to stimulated emission was observed in both fluorescence and dipole measurements. The dipole signal decline in low-polarity solvents indicates the importance of dipole-dipole interaction that causes reorientation of molecules upon photoexcitation.
Krasnoslobodtsev
Alexey V
AV
Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA.
Smirnov
Sergei N
SN
D003374:Coumarins / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation; D005453:Fluorescence; D008722:Methods; D010777:Photochemistry / Q000295:instrumentation / Q000379:methods*; D012997:Solvents; D013499:Surface Properties
D003374:Coumarins; D012997:Solvents; C030123:coumarin