Control on the photophysical responses of porphyrin-acridinium conjugates upon application of different orthogonal triggers

New covalently linked porphyrin–acridinium conjugates have shown photoinduced electron (eT) or energy (EnT) transfer processes that can be triggered by orthogonal stimulations such as addition of nucleophiles that convert acridinium units into acridane moieties.[1] It is also possible to selectively direct the flow of energy and electrons by modulation of the polarity of the solvent and upon changing the excitation site.[2] Control on the photophysical responses of porphyrin-acridinium conjugates upon application of different orthogonal triggers Aknowledgments: The work is supported by the European Union – Next Generation EU and the Italian Ministry of Environment and Energy Security (POR H2 AdP MMES/ENEA-CNR-RSE, PNRR–Mission 2, Component 2, Investment 3.5 "Ricerca e sviluppo sull'idrogeno") References: 1. A. Edo-Osagie, D. Serillon, F. Ruani et al., J. Am. Chem. Soc., 2023, 145, 10691-10699. 2. F. Ruani, D. Veclani, D. Sanchez-Resa et al., Chem. Eur. J., 2025, 0, e02604. 010 20 0.00 0.04 400 500 600 800 1000 1200 1400 -0.05 0.00 0.05 D A l (nm) end of pulse 7 ps 0.4 ps 13 ps 1 ps 20 ps 2.5 ps 31 ps 4 os 100 ps 408 nm 608 nm D A t (ps) trise = 0.6 ps tdecay = 3 ps ZnP•+ Acr•ZnP•+ eT eT +- CT EnT OHH+ toluene DCM EnT eT +- CT eT 290 nm 550 nm hh 565 nm h 360 nm h 565 nm h 510 nm h 510 nm h 565 nm h 010 20 30 0.00 0.05 480 600 800 1000 1200 1400 -0.04 0.00 0.04 D A l (nm) end of pulse 1.6 ps 70 ps 220 fs 3 ps 400 ps 250 fs 7 ps 2 ns 0.6 ps 13 ps 7 ns trise = 0.6 ps tdec1 = 3 ps tdec2 = 250 ps 447 nm 529 nm 652 nm D A t (ps) TPyP•-Acr• ZnP•+ 0200 400 600 800 0.000 0.006 450 600 800 1000 1200 1400 -0.02 0.00 0.02 D A l (nm) end of pulse 61 ps 2.5 ns 3 ps 109 ps 3 ns 8 ps 190 ps 5 ns 35 ps 618 ps 7 ns trise = 50 ps tdec = 250 ps D A t (ps) 593 nm 1059 nm 1TPyP ZnP•+ Acr• F. Ruani, D. Veclani, A. Barbieri, H.-P. Jacquot de Rouville, V. Heitz, B. Ventura, N. Armaroli Contacts: Federica Ruani [email protected] ISOF-CNR eT