A novel electron Donor-Acceptor Carbazole-Zn(II)Phthalocyanine – Perfluorinated Subphthalocyanine Conjugate: synthesis, characterization, and photoinduced electron-transfer

Porphyrinoids are considered perfect candidates for the preparation of model electron donor-acceptor (D-A) systems as they enable fast and efficient photoinduced electron transfer. Herein, we report on the synthesis and photophysical characterization of a ZnPc SubPc conjugate covalently connected through a short-range alkyne spacer. We designed and prepared the conjugate, which comprise, on the one hand, a perfluorinated SubPc with strong electron acceptor character and, on the other, a Pc peripherally functionalized with carbazoles with strong electron donor character. Photoinduced electron transfer events are in-depth analyzed by several techniques, including steady-state absorption, time-resolved emission and transient absorption measurements on different time scales. Our studies confirm a full charge separation occurring from a photoexcited charge transfer state68. Acknowledgements Financial support from Spanish MINECO (PID2020-116490GB I00, Porphyrinoids) is acknowledged. IMDEA Nanociencia acknowledges support from the “Severo Ochoa” Programme for Centres of Excellence in R&D (MINECO, Grant SEV2016-0686). J.L. acknowledges MECD, Spain, for a F.P.U. fellowship. Kuwait Foundation for the Advancement of Science (KFAS) and the RSP unit general facilities of the Faculty of Science GFS (GS 01/01, GS 02/01, GS 03/01, GS 01/03, GS 01/05) is acknowledged. Work in Erlangen was supported by the Deutsche Forschungsgemeinschaft (DFG) through SFB 953 project B10 and the Bavarian Collaborative Research Project “Solar Technologies go Hybrid" (SolTech