peri-Acenoacene Molecules: Tuning of the Singlet and Triplet Excitation Energies by Modifying their Radical Character

The energy difference between singlet and triplet excitons, or ΔEST, is a key magnitude for novel light-emission mechanisms (i.e., TADF or Thermally Activated Delayed Fluorescence) or other photoactivated processes. We...

Spin-Forbidden Excitation Enables Infrared Photoredox Catalysis

We describe a new family of catalysts that undergo direct ground state singlet to excited state triplet excitation with IR light, leading to photoredox catalysis without the energy waste associated with intersystem crossing. The finding allows a mole scale reaction in batch using infrared irradiation.

Spin-Forbidden Excitation Enables Infrared Photoredox Catalysis

We describe a new family of catalysts that undergo direct ground state singlet to excited state triplet excitation with IR light, leading to photoredox catalysis without the energy waste associated with intersystem crossing. The finding allows a mole scale reaction in batch using infrared irradiation.

The phosphorescence decay kinetics in the presence of a statistical distribution of molecules over the rates of radiative and non-radiative deactivation of triplet excitations

Approximate formulas of phosphorescence decay kinetics under the conditions of the statistical scatter of molecules over rate constants of radiative or non-radiative deactivation of triplet excitation have been obtained. It is shown that the phosphorescence decay function has different form for these two cases. The obtained difference in kinetics was used to establish the reason for the deviation from the exponential law and faster decay of the sensitized phosphorescence of naphthalene and diphenyl in n-paraffin matrices ( T = 77 K) in the presence of heavy atoms in the donor.