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(a) Photoswitching of the electron-poor di-ortho-fluoro di-ortho-chloro azobenzene 10. UV–vis spectra of 8 and 10: (b) 50 μM in DMSO is used to show the full spectrum; and (c) 500 μM in DMSO is used to visualize the extent of the n → π* band tails.
