Alexander J Auty, Paul A Scattergood, Theo Keane, Tao Cheng, Guanzhi Wu, Heather Carson, James Shipp, Andrew Sadler, Thomas Roseveare, Igor V Sazanovich, Anthony J H M Meijer, Dimitri Chekulaev, Paul I P Elliot, Mike Towrie, Julia A Weinstein
To unravel the role of driving force and structural changes in directing the photoinduced pathways in donor-bridge-acceptor (DBA) systems, we compared the ultrafast dynamics in novel DBAs which share a phenothiazine (PTZ) electron donor and a Pt(ii) trans -acetylide bridge (-C[triple bond, length as m-dash]C-Pt-C[triple bond, length as m-dash]C-), but bear different acceptors conjugated into the bridge (naphthalene-diimide, NDI; or naphthalene-monoimide, NAP). The excited state dynamics were elucidated by transient absorption, time-resolved infrared (TRIR, directly following electron density changes on the bridge/acceptor), and broadband fluorescence-upconversion (FLUP, directly following sub-picosecond intersystem crossing) spectroscopies, supported by TDDFT calculations...
October 25, 2023: Chemical Science