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The geometrical and spectral properties of the hydrogen-bonded clusters formed by 6-aminocoumarin (6AC) with solvents of different hydrogen-bonding abilities have been investigated at the CPCM-PBE0/6-311++G(d, p) level of theory. Upon photoexcitation, A type hydrogen bonds will be weakened whereas hydrogen bonds of B and C types should be strengthened. The weakening of hydrogen bond A is responsible...
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