By R.K. Saxena
ISBN-10: 8189972073
ISBN-13: 9788189972073
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Sample text
Have time to change position appreciably. This statement is referred to as the Franck-Condon principle. Since the electronic transition is rapid, the molecule will find itself with the same molecular on figuration and vibrational kinetic energy in the excited state that it had in the ground state at the moment of absorption of the photon. , there is no change in internuclear distance during the transition. 2. There is no general selection rule that restricts the change in vibrational state accompanying an electronic transition.
Evidence for the presence of functional groups can be obtained by comparison of the spectra with reported data. For this purpose, vmax' Emax' and band shapes can be employed. It is also important that the spectra be examined in a variety of solvents to be sure that the band shifts are in accord with expectations. Spectral data have been compiled by Sadtler, Lang, and Hershenson, and in "Organic Electronic Spectral Data" and the ASTM Coded IBM Cards. A review article by Mason and the text by Jaffe and Orchin are excellent for this type of application.
1 Saturated molecules Saturated molecules without lone pair electrons undergo highenergy'a ~ 0'* transitions in the far ultraviolet. For example, methane 48 BIOLOGY OF PHYSICAL SCIENCE has a maximum at 1219 Aand ethane at 1350 A corresponding to this transition. When lone pair electrons are available, a lower-energy n ---+ 0'* transition is often detected in addition to the 0' ---+ 0'*. For example, in triethylamine two transitions are observed, at 2273 and 1990 A. 2 Carbonyl compounds The carbonyl chromophore has been very extensively studied.
Biology of Physical Science by R.K. Saxena
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