Direct observation of the ultrafast intersystem crossing in tris(2,2′-bipyridine)ruthenium(II) using femtosecond stimulated Raman spectroscopy

Dyads and Triads Based on Phenothiazine, Bis(terpyridine)ruthenium(II) Complexes, and Fullerene

“…phosphorescence, non-radiative decay, energy or electron transfer) are known to start from this state. [10] We recently reported the photodynamic processes in dyads based on a bis(tpy)ruthenium(II) complex [Ru(tpy) 2 ] 2+ , a π-conjugated bridge, and a methano-or pyrrolidino-functionalized C 60 . [11] [Ru(tpy) 2 ] 2+ was chosen as photosensitizer and electron donor because of its intense absorption at ca.…”

Sensitivity of the photophysical properties of organometallic complexes to small chemical changes

“…It is believed that in complexes such as these a singlet-triplet intersystem crossing can occur in 50 fs. 17 This is more than five orders of magnitude greater than either excited state lifetime. As such, the population of the excited states has plenty of time to become a thermal population.…”

“…Second, it also allows a rapid ͑ϳ50 fs͒ intersystem crossing between singlet and triplet dominated states. 17 In organic complexes with no transition metal ion the spin-orbit coupling is much weaker, so triplet excitations tend to decay via nonradiative decay paths. [18][19][20] The character of the emitting state in organometallic complexes has attracted considerable interest and debate.…”

Properties of materials for organic light emitting diodes

“…Indeed SOC is often referred to as the 'heavy atom effect', and the variation of the effect with atomic number can be observed in a series of metal complexes with different metals, such as the Group 8 transition metals iron, ruthenium and osmium. 42 14, [47][48][49][50] With respect to OLEDs, the sixth row transition metal elements iridium, 21,51 osmium 52,53 and platinum 37 have been particularly fruitful. Complexes based on these metals are characterised by metal-to-ligand charge transfer (MLCT) transitions and higher energy ligand-based - * transitions.…”

“…However, unlike ground state crystal structures, excited state geometries are far more difficult to probe experimentally. While structural techniques do exist for examining excited state geometries 47,48,276 they are not routine techniques, requiring complicated experimental set-ups and detailed interpretation. Certainly, a clear picture like that offered by a crystal structure will not be possible.…”