Please use this identifier to cite or link to this item:
Title: Distance dependence of triplet energy transfer in water and organic solvents: A QM/MD study
Author: Curutchet Barat, Carles E.
Voityuk, Alexander A.
Keywords: Dinàmica molecular
Transferència d'energia
Química quàntica
Molecular dynamics
Energy transfer
Quantum chemistry
Issue Date: 25-Oct-2012
Publisher: American Chemical Society
Abstract: The possibility to optimize optoelectronic devices, such as organic light-emitting diodes or solar cells, by exploiting the special characteristics of triplet electronic states and their migration ability is attracting increased attention. In this study, we analyze how an intervening solvent modifies the distance dependence of triplet electronic energy transfer (TEET) processes by combining molecular dynamics simulations with quantum chemical calculations of the transfer matrix elements using the Fragment Excitation Difference (FED) method. We determine the β parameter characterizing the exponential distance decay of TEET rates in a stacked perylene dimer in water, chloroform, and benzene solutions. Our results indicate that the solvent dependence of β (βvacuum = 5.14 Å-1 > βwater = 3.77 Å-1 > βchloroform = 3.61 Å-1 > βbenzene = 3.44 Å-1) can be rationalized adopting the McConnell model of superexchange, where smaller triplet energy differences between the donor and the solvent lead to smaller β constants. We also estimate the decay of hole transfer (HT) and excess electron transfer (EET) processes in the system using the Fragment Charge Difference (FCD) method and find that βTEET can be reasonably well approximated by the sum of βEET and βHT constants.
Note: Versió postprint del document publicat a:
It is part of: Journal of Physical Chemistry C, 2012, vol. 116, num. 42, p. 22179-22185
ISSN: 1932-7447
Appears in Collections:Articles publicats en revistes (Farmàcia, Tecnologia Farmacèutica i Fisicoquímica)

Files in This Item:
File Description SizeFormat 
618917.pdf4.03 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.