Octahedral iridium (d5) ion complexes with different ligands have been widely investigated during the past decade in condensed and gas phases; however the photophysical processes are not firmly established.In this study, ultrafast transient absorption spectra with different photoexcitation wavelengths are reported in chloroform solutions of IrBr62- complexes. The results suggest that the complex excited into a LMCT state undergoes vibrational relaxation within 2 ps. The subsequent radiationless relaxation process is solvent dependent and completes within 1 ns. Also, vibrational coherence is found in the chloroform solutions of IrBr62- upon 760 nm excitation, consistent with previously obtained results by our group for this complex in aqueous solutions. In contrast to the gas-phase, no dissociation processes are observed in solutions. A possible reason is that the excited complex undergoes fast dissipation of vibrational energy to the surrounding solvent environment.

Ultrafast photophysics of hexabromoiridate dianion in chloroform solutions

245th National Meeting (2013)

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