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A synthetic green fluorescent protein analogue showed Zn2+‐induced fluorescence in organic solvents (Φ = 0.07 at r.t. and up to 0.3 at low temperature). The experimental observations and theoretical calculations suggest that Zn2+ binding inhibits the free rotation of an aryl–alkene bond, which allows excited molecules to relax through the emission pathway instead of the thermodynamic pathway. The...
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