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Unsymmetrical photochromic diarylethenes 1o–4o have been synthesized, which diarylethenes 1o–3o have a chlorine atom at ortho-, meta- and para-position of the terminal phenyl ring, respectively. The substituent position effect of chlorine atom on their properties, including photochromism both in solution and in the single crystalline phase and their electrochemical properties were investigated in...
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