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 pr oducts. 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 sp ectral resolution match those of 9,10-diphenylphenanthrene. A new phot ophysical constraint is introduced as an additional criterion for just ifying the results of the self-modeling spectral resolution. Relative photochemical efficiencies of tetraphenylethylene under different cond itions are determined and discussed in terms of their mechanistic impl ications.