The model for rational design of carbene metal amide (cMa) complexes with large oscillator strengths while also decreasing the energy of the singlet and triplet splitting (dEST) is presented. A series of binuclear cMa complexes bearing Janus carbenes have been synthesized and studied. The binuclear cMa complexes exhibit short lifetimes (tau = 200-300 ns) with high photoluminescence efficiencies (PL >95%). The radiative rates of binuclear cMa complexes are 3~4 times faster than that of the corresponding mononuclear cMa complexes. Analysis of temperature-dependent luminescence data indicates that the fluorescent lifetime for the singlet state (tS1) of binuclear cMa complexes are near 12 ns with a dEST of 40-50 meV. The presented compounds provide a general design for cMa complexes to achieve small values for dEST while retaining high radiative rates.
Binuclear Two-Coordinate Coinage Metal Complexes
30 January 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.