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Article Dans Une Revue Journal of Physical Chemistry A Année : 1998

Interactions between the Excited States of Ruthenium(II)−Diimine Complexes and Phenols in Aqueous Solution

Résumé

Interactions between the MLCT excited states of Ru(bpy)3 2+ (bpy ) 2,2¢-bipyridine) or Ru(bpz)3 2+ (bpz ) 2,2¢-bipyrazine) and phenol or monochlorophenols have been investigated in aqueous solution using steadystate and time-resolved spectrofluorimetry. The presence of phenol (PhOH), which does not quench *Ru(bpy)3 2+ in mildly acidic solution, causes the emission to undergo a blue shift with increasing [PhOH]; the emission quantum yields and the excited-state lifetimes decrease with increasing [PhOH] at low temperatures (5-35 °C) but increase with increasing [PhOH] at higher temperatures (35-70 °C). This behavior is understood in terms of the variations in the rate constants of the temperature-independent radiative and nonradiative decays of *Ru(bpy)3 2+ and the activation-controlled population of the metal-centered excited state as [PhOH] is changed. The presence of chlorophenols has no effect on the photophysics of *Ru(bpy)3 2+; PhOH reductively quenches *Ru(bpz)3 2+.

Dates et versions

hal-03052818 , version 1 (10-12-2020)

Identifiants

Citer

Cang Li, Morton Z Hoffman, Christine Pizzocaro, Gilles Mailhot, Michèle Bolte. Interactions between the Excited States of Ruthenium(II)−Diimine Complexes and Phenols in Aqueous Solution. Journal of Physical Chemistry A, 1998, 102 (38), pp.7370-7374. ⟨10.1021/jp9814101⟩. ⟨hal-03052818⟩
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