Intermolecular Effects on Intersystem Crossing Studied on the Picosecond Time Scale: The Solvent Polarity Effect on the Rate of Singlet to Triplet Intersystem Crossing of Diphenylcarbene

摘要

Intersystem crossing plays a critical role in defining the intramolecular dynamics of diphenylcarbene (DPC) and thereby directly affects its spin state depdent chemistry. In the studies reported here the diphenylcarbene is generated by photoexcitation of diphenyldiazomethane in the ultraviolet, which yields DPC upon loss of nitrogen from the excited singlet state of the diazo compound. Once formed, DPC will undergo energy relaxation via intersystem crossing to produce the ground triplet.