ANGLES OF RING TWIST IN THE LOWEST TRIPLET STATE OF BENZOPHENONE
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Date
1980
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Ohio State University
Abstract
Previous optical detection of magnetic resonance experiments on $^{3}(n\pi^{*})$ benzophenone have established that this prototype photochemical system has (1) a highly localized n-electron distribution, (2) a highly delocalized $\pi^{*}$-electron distribution, and (3) an essentially planar $C_{1}-C(0)-C_{1}^{\prime}$ $framework.^{1-3}$ Other structural features, however, remain to be exposed. In this report, we describe detailed measurements of the angular dependence of the optically-detected $^{19} F$ ENDOR spectrum of $3(n\pi^{*}) 4,4^{\prime}$-difluorobenzophenone in the single crystal host $4,4^{\prime}$-dibromodiphynylether. An analysis of the data yields accurate values for the angles of ring twist in the lowest triplet state and confirms the significant $\pi^{*}$-electron delocalization model for the parent molecule.
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$^{1}$J. A. Mucha and D. W. Pratt, Chem. Phys. Letters 37, 40 (1976). $^{2}$P. F. Brode III and D. W. Pratt, Chem. Phys. Letters 59, 334 (1978). $^{3}$S. Yamauchi and D. W. Pratt, Chem. Phys. Letters 60, 145 (1978).
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