The photophysics of malachite green (MG) and its derivatives has been a subject of numerous studies, particularly when it comes to the viscosity-dependent deactivation pathways of its singlet excited state. Using ultrafast transient absorption spectroscopy, we have recently started revisiting the excited state dynamics of MG and its dimethylated derivative when dissolved in a series of monoalcohols with increasing viscosity, with the aim of probing both S1 and S2 excited states and understanding how molecular motions are affected by viscosity and steric hindrance. As expected, preliminary results show that an increasing solvent viscosity results in slower excited state deactivations for both molecules, with a linear dependence observed between the logarithm of S1 lifetime and viscosity of the solvent.
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Contact:
Eric Vauthey
Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)
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