Quantifying through-space charge transfer dynamics in π-coupled molecular systems
Arunabh Batra, Gregor Kladnik, Héctor Vázquez, Jeffrey S. Meisner, Luca Floreano, Colin Nuckolls, Dean Cvetko, Alberto Morgante, Latha Venkataraman
In this paper, through space charge transfer is studied in the context of para-cyclophanes on gold (111). Aside, from XPS and NEXAFS, this study utilizes resonant photoemission spectroscopy (RPES) core-hole clock method, previously used to measure femtosecond (fs) charge-transfer times between molecule–metal interfaces like C60, aromatic thiols, amines and donor–acceptor complexes on Au (111). They find that the charge transfer time across the π-system of 44PCP (a) is about 20 times slower than across that of 22PCP (b), and attribute this longer charge transfer time to poor through-space coupling between the rings of the molecule.