QUANTITATIVE APPLICATION OF PRINCIPAL COMPONENT ANALYSIS AND SELF-MODELING SPECTRAL RESOLUTION TO PRODUCT ANALYSIS OF TETRAPHENYLETHYLENES PHOTOCHEMICAL-REACTIONS

Tetraphenylethylene readily undergoes photochemical reactions in room-temperature solutions. Principal component analysis and self-modeling spectral resolution are applied to the characterization of reaction products. On the basis of principal component analysis, the results show that only one product is formed in the reactions, and the absorption and fluorescence spectra of the product obtained from self-modeling spectral resolution match those of 9,10-diphenylphenanthrene. A new photophysical constraint is introduced as an additional criterion for justifying the results of the self-modeling spectral resolution. Relative photochemical efficiencies of tetraphenylethylene under different conditions are determined and discussed in terms of their mechanistic implications.