86950-19-8Relevant academic research and scientific papers
The Endoperoxide of Mesodiphenylhelianthrene. Four Reaction Channels Leading from Different Upper Excited Electronic States to Cycloreversion
Schmidt, R.
, p. 813 - 815 (2007/10/02)
The photocycloreversion of the endoperoxide of mesodiphenylhelianthrene (MDHPO) regenerating the parent hydrocarbon and oxygen has been investigated at ten different irradiation wavelengths.A marked stepwise energy dependence with four almost energy independent plateaus has been observed for the quantum yield Q.A correlation between the step energies and the singlet state energies of MDHPO indicates that the extraordinary energy dependence of Q is a result of four different reaction channels which originate from different thermally equilibrated Sn (n > 2) singlet states and lead to cycloreversion.The quantum yield of each reaction channel has been calculated.The correlation between these values and the corresponding internal conversion energy gaps supports this interpretation. - Photochemistry / Solutions / Spectroscopy / Ultraviolet
