Abstract
The D-(+)-camphor-3-spiropyrazolines, 3-diazo-D-(+)-camphor and 3,3′- di-D-(+)-camphorquinone, are characterized by nearly independent chromophores. Energy transfer between these chromphores is studied by monitoring the photoreactions which occur when the two chromophores are excited. There is complete energy transfer from the carbonyl to the pyrazoline group and 100% quantum yield for the nitrogen elimination reaction is found. Consequently no asymmetry effects are detected. A limited transfer is operative in diazocamphor, the quantum yield of decay being 33% for high energy (carbonyl) excitation but only 5% for direct population of the lowest-lying (diazo) excited state. The same unknown intermediate product is formed irrespective of which chromophore is excited. Diazocamphorquinone shows cis-trans isomerization as the only fast reaction. The energy transfer mechanisms are discussed.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call