Tuning the excited states in <i>fac</i>-[Re(X<sub>2</sub>dppz)(CO)<sub>3</sub>(L)]
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Date
2004
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Abstract
Excited state lifetime measurements - emission, emission lifetime and Resonance Raman - have been conducted on the series fac-[Re(X(2)dppz)(CO)(3)(L)](0,+) (L = Cl-, 4-ethylpyridine (4-Etpy), 4,4'-bipyridine (4,4'-bpy)), with the X(2)dppz substituted dipyrido[3,2-a:2',3'-c] phenazine ligands (X = CH3 and Cl). The results are consistent with closely lying excited states, with pipi* lowest, but MLCT contributing significantly to excited state lifetimes for the neutral complexes. fac-[Re(Cl(2)dppz)(CO)(3)Cl] appears to undergo a crossover from lowest pipi* to lowest MLCT through the glass to fluid transition.