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Photochromic properties of BTE-2PBT triad. (a) Photochromic reactions of BTE-2PBT; (b) Photochromism of BTE-2PBT in solid state; (c) Absorption change and fatigue resistance of BTE-2PBT in hexane (2.0 × 10−5 M) upon photochromism; (d) Absorption change and fatigue resistance of BTE-2PBT in PMMA film (5 wt %) upon photochromism.
