Methylene Blue Exciton States Steer Nonradiative Relaxation: Ultrafast Spectroscopy of Methylene Blue Dimer.
作者： Jacob C. Dean , Daniel G. Oblinsky , Shahnawaz Rafiq , Gregory D. Scholes
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摘要: The photochemistry and aggregation properties of methylene blue (MB) lead to its popular use in photodynamic therapy. facile formation strongly coupled “face-to-face” H-aggregates concentrated aqueous solution, however, significantly changes spectroscopic photophysics. photoinitiated dynamics the simplest MB aggregate, MB2, was investigated over femtosecond nanosecond time scales revealing sequential internal conversion events that fully relax excited population. monomer were analyzed tandem for a direct comparison. First, ultrafast from electric-dipole allowed upper exciton state lower forbidden evaluated by broadband transient absorption (BBTA) two-dimensional electronic spectroscopy (2DES) with resolution ∼10 fs. Lineshape analysis MB2 2DES bands at 298 77 K show effectively no difference diagonal/antidiagonal line width ratio dimer, marked cont...
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