Effect of donor orientation on ultrafast intermolecular electron transfer in coumarin-amine systems

The Journal of Chemical Physics
Prabhat K SinghHaridas Pal

Abstract

Effect of donor amine orientation on nondiffusive ultrafast intermolecular electron transfer (ET) reactions in coumarin-amine systems has been investigated using femtosecond fluorescence upconversion measurements. Intermolecular ET from different aromatic and aliphatic amines used as donor solvents to the excited coumarin-151 (C151) acceptor occurs with ultrafast rates such that the shortest fluorescence lifetime component (tau(1)) is the measure of the fastest ET rate (tau(1)=tau(ET) (fast)=(k(ET) (fast))(-1)), assigned to the C151-amine contact pairs in which amine donors are properly oriented with respect to C151 to maximize the acceptor-donor electronic coupling (V(el)). It is interestingly observed that as the amine solvents are diluted by suitable diluents (either keeping solvent dielectric constant similar or with increasing dielectric constant), the tau(1) remains almost in the similar range as long as the amine dilution does not cross a certain critical limit, which in terms of the amine mole fraction (x(A)) is found to be approximately 0.4 for aromatic amines and approximately 0.8 for aliphatic amines. Beyond these dilutions in the two respective cases of the amine systems, the tau(1) values are seen to increase very ...Continue Reading

References

Mar 25, 2000·Photochemistry and Photobiology·M K SinghA V Sapre
Aug 30, 2003·Photochemistry and Photobiology·J MohantyA V Sapre
Jun 25, 2005·The Journal of Chemical Physics·M Dolores Elola, Branka M Ladanyi
Nov 23, 2006·The Journal of Chemical Physics·M Dolores Elola, Branka M Ladanyi
May 22, 2008·The Journal of Physical Chemistry. a·Michael G KuzminElena V Dolotova

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Citations

Mar 30, 2011·Physical Chemistry Chemical Physics : PCCP·Prabhat K SinghSukhendu Nath
Feb 1, 2017·The Journal of Physical Chemistry. B·Puspal MukherjeePratik Sen
Aug 6, 2014·The Journal of Physical Chemistry. a·Poonam Verma, Haridas Pal
Nov 10, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Sethuraman MuthuramalingamRamasamy Mayilmurugan
Jun 29, 2010·Chemistry : a European Journal·Anvita SrivastavaSukhendu Nath
Nov 18, 2020·International Journal of Biological Macromolecules·Niyati H MudliarPrabhat K Singh
Apr 13, 2010·The Journal of Physical Chemistry. B·Prabhat K SinghSukhendu Nath
Jan 26, 2010·The Journal of Physical Chemistry. B·Prabhat K SinghSukhendu Nath
Mar 25, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ankur A AwasthiPrabhat K Singh
Jun 18, 2021·The Journal of Physical Chemistry. B·Gaurav SinghPrabhat K Singh
Jul 1, 2021·Physical Chemistry Chemical Physics : PCCP·Shrishti P PandeyPrabhat K Singh
Dec 14, 2016·Chemical Reviews·Tatu KumpulainenEric Vauthey
Oct 17, 2017·The Journal of Physical Chemistry. B·Ankur A Awasthi, Prabhat K Singh
Dec 5, 2020·The Journal of Physical Chemistry. B·Marissa Saladin, Mark Maroncelli
Sep 4, 2021·Journal of the American Chemical Society·Yusuke YonedaHiroshi Miyasaka

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