Knowledge Bank

The original magnetic resonance studies of dipheny Imethylene in single crystal $hosts1,2$ have been extended. EPR and ENDOR experiments on diphenylmethylene in diphenylethylene, benzophenone, and 4-bromopheoyl ether will be discussed. The orientation and conformation of this ground state triplet in each of these hosts will be described, with a view toward the understanding of the differences in the $T1$ $\leftarrow$ $T0$ optical spectrum in each host.