Primary electron-transfer dynamics in 2-phenylindole-9-cyanoanthracene system. A comparative study with 2-methylindole

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
T BhattacharyaT Ganguly

Abstract

Electrochemical measurements by cyclic voltammetry predict the possibility of occurrence of photoinduced electron-transfer (PET) reactions between the ground state of 2-phenylindole (2PI) (electron donor) and the excited singlet of 9-cyanoanthracene (9CNA) molecule acting as an electron acceptor. However, 2PI should be expected to behave as a relatively weaker electron donating agent than the structurally related donor 2-methylindole (2MI) as it possesses higher oxidation potential value. Both steady-state and time-resolved spectroscopic measurements in the polar acetonitrile (ACN) and ethanol (EtOH) solvents show that the fluorescence quenching phenomenon of 9CNA in presence of 2PI is primarily due to the involvement of dynamic process which in high probability should be PET. Nevertheless, in less polar tetrahydrofuran (THF) medium, the quenching of 9CNA results from the combined effect of dynamic and static modes. The transient absorption spectra, measured by using nanosecond laser flash photolysis, of 9CNA in presence of 2PI exhibit the signature of the bands of the anionic species of 9CNA, cation of the donor 2PI and the contact neutral radical. Observations of the transient absorption at the different delays infer that ion...Continue Reading

References

May 14, 1975·Journal of the American Chemical Society·D V Bent, E Hayon
Feb 1, 1971·Archives of Biochemistry and Biophysics·R F Chen
Jan 14, 2003·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·T BhattacharyaT Ganguly

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Citations

Jun 16, 2005·Photomedicine and Laser Surgery
Sep 8, 2005·Photomedicine and Laser Surgery
Jul 25, 2006·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Paulami MandalTapan Ganguly
Oct 24, 2013·Physical Chemistry Chemical Physics : PCCP·Himadri ChakrabortiSuman Kalyan Pal

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