Intramolecular electron transfer in the reductive chromophore-quencher complex [(bpy)Re(CO)3(py-PTZ)]+

Ultrafast Excited State Dynamics Controlling Photochemical Isomerization of N‐Methyl‐4‐[trans‐2‐(4‐pyridyl)ethenyl]pyridinium Coordinated to a {ReI(CO)3(2,2′‐bipyridine)} Chromophore

“…Thus, for example, reducing ligands X (phenothiazine, tryptophane, tyrosine) can act as electron donors toward the Re II center, effectively quenching the 3 MLCT excited state. [18,[26][27][28][29][30][31][32][33] Recently, we have investigated the mechanisms of two ultrafast optically induced processes involving the axial ligand X: an interligand electron transfer (ILET) [34,35] …”

Relativistic effects in spectroscopy and photophysics of heavy-metal complexes illustrated by spin–orbit calculations of [Re(imidazole)(CO)3(phen)]+

“…It will be demonstrated that the SO model accounts very well for absorption spectra, emission properties, and excited-state dynamics, some of its conclusions being qualitatively different from the spinfree approach. [Re(imH)(CO) 3 (phen)] + represents a broad class of Re I tricarbonyl-diimine complexes [21][22][23], which show very rich photophysics and photochemistry [10,14,15,24] and engage in a range of photonic applications such as photosensitizers and phototriggers of electron-transfer reactions [11,[25][26][27][28][29], photocatalysts of CO 2 reduction [30][31][32], phosphorescent labels and probes of biomolecules [33][34][35][36], sensors [37,38], molecular switches [39][40][41][42] and OLED emitters [43], or probes of ps-ns dynamics of solvents, proteins or supramolecular hosts [11,24,50,51,[63][64][65]. The chosen example [Re(imH)(CO) 3 (phen)] + [44] not only epitomizes the salient features of Re I carbonyl-diimine photophysics but also has a prominent position amongst Re-based photosensitizers because of its ability to trigger photoinduced electron transfer and relaxation dynamics in Re-labeled proteins [11,25,[44]…”

Harvesting solar energy using conjugated metallopolyyne donors containing electron-rich phenothiazine–oligothiophene moieties

“…Phenothiazine (PTZ) belongs to an important class of tricyclic nitrogen-sulfur heterocycles [56], with a broad spectrum of pharmacological activity [57][58][59][60][61][62][63] Phenothiazine has low and highly reversible first oxidation potentials [64][65][66][67] with pronounced propensities to form stable radical cations. Also, phenothiazine and its derivatives serve as good intramolecular reductive quenchers because they show a facile one electron oxidation, and the PTZ radical cation (PTZ Å+ ) is known to have a strong absorption in the visible region [68][69] This makes the identification of the charge-separated intermediate formed upon electron transfer from PTZ to the 3 MLCT excited state of the chromophore unambiguous [70][71][72][73]. The electron-rich nature of phenothiazine makes it a good electron donor in some studies related to donor-chromophore-acceptor triad for photoinduced charge separation [70][71][72][73] and it is also a good electron donor for reductive quenching [74,75].…”