Direct observation of carbene and diazo formation from aryldiazirines by ultrafast infrared spectroscopy.
Ultrafast laser flash photolysis (lambda(ex) = 270 nm) of phenyldiazirine produces transient infrared absorptions at 2040 and 1582 cm(-1). The first band is assigned to phenyldiazomethane, and the second is assigned to singlet phenylcarbene. This assignment is consistent with DFT calculations. Diazo band integration reveals that photoisomerization from diazirine to diazo occurs within a few picoseconds of the laser pulse. The majority of carbene produced is also formed instantaneously.
Zhang
Yunlong
Y
Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
Burdzinski
Gotard
G
Kubicki
Jacek
J
Platz
Matthew S
MS