Accession Number : ADA299985

Title :   Light Induced Cluster-to-Organic-Acceptor Charge Transfer in a Molecular Cadmium Sulfide Assembly.

Descriptive Note : Technical rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY

Personal Author(s) : Yoon, Dong I. ; Selmarten, Donald C. ; Lu, Hong ; Liu, Hui-Jean ; Mottley, Carolyn

PDF Url : ADA299985

Report Date : 07 JUN 1995

Pagination or Media Count : 18

Abstract : The molecular cluster, (Cd4(S-C6H4NO2)10)?N(CH3)4!2, exhibits an intense near-UV absorption that is absent in the corresponding benzenethiolate cluster. Resonance Raman and electronic Stark effect studies show that the absorption feature originates from a pair of closely spaced cluster-to-nitrobenzene charge-transfer transitions. The lower lying charge-transfer excited state is weakly luminescent. Time resolved luminescence measurements yield a nonradiative decay or back electron transfer rate (nitrobenzene to cluster) of 3.3 x 10(exp 8)/s. Further analysis of resonance Raman scattering reveals that at least 7 vibrational modes are coupled, in a Franck-Condon sense, to the electron transfer process. In terms of absolute normal coordinate displacement, the two most important modes are Cd-S and N-O stretches. jg

Descriptors :   *LIGHT SCATTERING, *MOLECULES, *CLUSTERING, *ORGANIC MATERIALS, *CHARGE TRANSFER, *ASSEMBLY, *ELECTRON ACCEPTORS, *CADMIUM SULFIDES, MEASUREMENT, VIBRATION, EXCITATION, DISPLACEMENT, RESONANCE SCATTERING, NITROGEN, OXYGEN, ABSORPTION, LUMINESCENCE, ELECTRON TRANSFER, STARK EFFECT, RAMAN SPECTRA, NITROBENZENES, NEAR ULTRAVIOLET RADIATION.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE