Exploring the photophysical properties of malachite green (MG) remains a compelling area of research, specifically regarding the complex relationship between its electronic transitions and structural configurations. The well-known Vavilov rule states that the fluorescence spectrum and quantum yield of a molecule are independent of the excitation wavelength. We observed a clear breakdown of this rule with MG in solution. Our recent measurements reveal that both the intensity and the maximum of the S1 → S0 emission band of MG depend on whether excitation is carried out in the S2 ← S0 or S1 ← S0 bands. This effect is due to the very fast non-radiative decay of the S1 state which involves a S1/S0 conical intersection.
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Eric Vauthey
Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)
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