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Abstract
We reported previously that sterically hindered photochromic 4a,4b-dihydrophenanthrenes can exist in two modifications. These labile intermediates are designated as L (long) or S (short) according to the position of their visible absorption band. W e presently suggest that these are two conformers ap (L) and ac (S) of the central C(4a)-C(4b) ethane unit. ap is the more planar while ac is decidedly distorted. Spectral characteristics—the position and intensity of the visible absorption band-provide the basis for the conformation assignment. The relative stabilities of L and S depend on the type and magnitude of the steric interaction X(4)-X(5) vs. X(4)-H(4b) /X(5)-H(4a)
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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