Photoinduced charge shift and charge recombination through an alkynyl spacer for an expanded acridinium-based dyad†
Andrew C. Benniston,Jerry Hagon,Xiaoyan He,Helge Lemmetyinen,Nikolai V. Tkachenko,William Clegg,Ross W. Harrington
Physical Chemistry Chemical Physics Pub Date : 01/18/2012 00:00:00 , DOI:10.1039/C2CP23273A
Abstract

The photophysical and electrochemical properties of a dyad comprising an expanded acridinium light-harvester, coupled via a triple bond to a trialkyloxybenzene donor, are described. Laser excitation of the dyad in 1,2-dichloroethane (DCE) results in rapid charge shift (5 ps) followed by slower charge recombination (81 ps) to completely restore the ground state. Discrimination between forward and return electron transfer (kret/kfor ∼ 16) is rather poor. There is no indication of triplet formation on the expanded acridinium-based group following charge recombination.

Graphical abstract: Photoinduced charge shift and charge recombination through an alkynyl spacer for an expanded acridinium-based dyad