TheabilityofFo ̈rstertheorytodescribeelectronicenergytransferrates,andtheirsolvent-dependence, have been studied theoretically in a series of 15 solvents of varying degrees of polarity for a rigid closely-spaced dyad, constituted by two boron dipyrromethene dyes, which was recently studied experimentally by Harriman & Ziessel, Photochem. Photobiol. Sci., 2010, 9, 960. We use time-dependent density functional theory calculations coupled to the polarizable continuum model to analyse the solvent-dependence of the spectroscopic and energy transfer properties of the system. This methodology allows us to examine the impact of the solvent on both electronic (solvent screening) and structural (dipole separation and orientation) factors by consistently incorporating solvent effects in the determination of molecular geometries, transition densities, and electronic couplings. In addition, we analyse the impact of bridge-mediated contributions to the electronic interaction between the dyes. We are therefore able to assess whether a Fo ̈ rster-type point-dipole approximation is valid for the molecular system studied.
Quantum mechanical study of the solvent-dependence of electronic energy transfer rates in a Bodipy closely-spaced dyad
CAPRASECCA, STEFANO;MENNUCCI, BENEDETTA
2011-01-01
Abstract
TheabilityofFo ̈rstertheorytodescribeelectronicenergytransferrates,andtheirsolvent-dependence, have been studied theoretically in a series of 15 solvents of varying degrees of polarity for a rigid closely-spaced dyad, constituted by two boron dipyrromethene dyes, which was recently studied experimentally by Harriman & Ziessel, Photochem. Photobiol. Sci., 2010, 9, 960. We use time-dependent density functional theory calculations coupled to the polarizable continuum model to analyse the solvent-dependence of the spectroscopic and energy transfer properties of the system. This methodology allows us to examine the impact of the solvent on both electronic (solvent screening) and structural (dipole separation and orientation) factors by consistently incorporating solvent effects in the determination of molecular geometries, transition densities, and electronic couplings. In addition, we analyse the impact of bridge-mediated contributions to the electronic interaction between the dyes. We are therefore able to assess whether a Fo ̈ rster-type point-dipole approximation is valid for the molecular system studied.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
