2003 Articles

Photoisomerization of 2,3-diphenylcyclopropane-1-carboxylic acid derivatives

Sivaguru, J.; Jockusch, Steffen; Turro, Nicholas J.; Ramamurthy, V.

Contrary to what is known about cis-1,2-diphenylcyclopropane and its derivatives, we find that they have triplet energies of ca. 311 kJ mol−1, do not undergo intersystem crossing upon direct excitation, undergo the less common adiabatic photoisomerization to the corresponding trans isomers, and show emission from excited 1,3-diradical intermediates.