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Review is presented regarding all structural and spectroscopic results reported on the reaction mechanism of photochromic ortho-nitrobenzylpyridines from the discovery of photochromism of 2-(2′,4′-dinitrobenzyl)pyridine in 1925 until the present. Although interpreted in various ways, the structural and spectroscopic data appear to be consistent with the widely accepted mechanism in which the photochromic...
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