scholarly journals Resonance Raman study of the solvent dynamics for ultrafast charge transfer transition in 4-nitro-4′-dimethylamino-azobenzene

2003 ◽  
Vol 118 (12) ◽  
pp. 5526-5536 ◽  
Author(s):  
Nandita Biswas ◽  
Siva Umapathy
Keyword(s):  
Charge Transfer ◽  
Resonance Raman ◽  
Charge Transfer Transition ◽  
Solvent Dynamics ◽  
Raman Study ◽  
Ultrafast Charge Transfer

FT-Raman Study on Charge-Transfer Polyiodide Complexes and Comparison with Resonance Raman Results

1994 ◽  
Vol 48 (10) ◽  
pp. 1236-1241 ◽  
Author(s):  
Paola Deplano ◽  
Francesco A. Devillanova ◽  
John R. Ferraro ◽  
Maria Laura Mercuri ◽  
Vito Lippolis ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Resonance Raman ◽  
Structural Data ◽  
Close Correlation ◽  
Interatomic Distances ◽  
X Ray ◽  
Raman Study ◽  
The Fourier Transform ◽  
Fourier Transform Raman ◽  
Ft Raman

In resonance Raman (RR) spectroscopy, the laser excitation sources have often been found to be destructive towards polyiodides if compared with the milder conditions under which the Fourier transform Raman (FT-R) technique operates. In fact, our FT-R spectra of some model polyiodides—[(CH3)4N]I5 (I5− bent), [(C2H5)4N]I7, and [(CH3)4N]I9—are significantly different from the literature RR data, give evidence of decomposition of the samples in RR, and are in agreement, respectively, with the I− · 2I2, I3− · 2I2 and (I− · 2I2) · 2I2 descriptions. In addition to the above-cited cases, the FT-R spectra of (Mn(modtc)3]Is (modtc = morpholine carbodithioato) and (moH]I5 (moH = morpholinium) are reported. The crystal structures indicate that in these two compounds the I5 anions can be properly described as I− · 2I2 and I3− · I2, respectively, and FT-R spectra agree well with this formulation. Moreover, the first FT-R spectrum of an I164– anion in [mo2ttl]2I16, ([mo2ttl]2+ = 3,5-di( N-morpholinio)-1,2,4-trithiolane), whose X-ray structure shows a sequence of two I3− … I2 … I− ·I2 (I82–) interacting anions, is reported. A close correlation of the FT-Raman peaks with the molecular species, identified by the interatomic distances, is also observed in this case. Thus, a combination of X-ray structural data and FT-R data can provide a reasonable interpretation of the nature of the acceptor iodine moiety in charge-transfer polyiodide complexes.

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