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[en] Several anilino-pyridinium-type hemicyanines including flexible and bridged model compounds are compared using experimental and quantum chemical methods. The flexible compounds show broadened fluorescence band and exhibit strong fluorescence quenching connected with a barrierless viscosity-controlled transition from the planar to the perpendicular geometry. The latter is connected with a small S1-S0 and a vanishing S1-T1 energy gap, with charge localization and with forbidden emissive character
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