By Stephen G. Schulman
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Extra info for Fluorescence and Phosphorescence Spectroscopy. Physicochemical Principles and Practice
The carbonyl group), enhance charge-transfer by introducing a partial positive charge into the charge-transfer acceptor group. This interaction stabilizes the charge-transfer excited state relative to the ground state so that the absorption spectra shift to longer wavelengths with increasing hydrogen bond donor capacity of the solvent. g. -0Hf -NH 2 ). g. -OH, -NH2)· This is effected by the partial withdrawal of the positively charged proton from the functional group. g. -C-OH), inhibits charge-transfer by leaving a residual negative charge on the functional group.
Molecular P h o t o c h e m i s t r y , Benjamin, New York, 1965. Winefordner, J . D . , Schulman, S. G. and O'Haver, T. C , Luminescence Spectrometry i n A n a l y t i c a l Chemistry, Wiley, New York, 1972. , Absorption of Light and U l t r a v i o l e t Radiation: Fluorescence and Phosphorescence Bnission, Allyn and Bacon, Boston, 1973. G r i f f i t h s , J . , Colour and Constitution of Organic Molecules, Academic Press, New York, 1976. 44 CHAPTER 2 PHOTOPHYSICAL PROCESSES IN MOLECULES IN SOLUTION In the preceding chapter, the arguments developed concerning the spectroscopic behavior of molecules were based upon the intrinsic electronic properties of the molecules themselves.
Sidman, J . , Chem. R e v s . , 5JS, 689 (1958). Turro, N . , Molecular P h o t o c h e m i s t r y , Benjamin, New York, 1965. Winefordner, J . D . , Schulman, S. G. and O'Haver, T. C , Luminescence Spectrometry i n A n a l y t i c a l Chemistry, Wiley, New York, 1972. , Absorption of Light and U l t r a v i o l e t Radiation: Fluorescence and Phosphorescence Bnission, Allyn and Bacon, Boston, 1973. G r i f f i t h s , J . , Colour and Constitution of Organic Molecules, Academic Press, New York, 1976.