Photophysical and photochemical processes followed by 320 nm femtosecond laser excitation of IrCl62− complex in aqueous and methanol solutions

• Primary photophysical processes for IrCl62− complex in solutions were studied.
• Mixed LMCT and d–d states in the near UV spectral region were excited.
• The characteristic time of the ground state recovery is 20–30 ps.
• Ground state recovery is consistent with low photochemical activity of near UV bands.

Ultrafast pump-probe spectroscopy (λpump = 320 nm) was applied to study the primary photochemical processes for IrCl62− complex in aqueous and methanol solutions. The excitation to the mixed LMCT and d–d states was followed by formation of an intermediate absorption completely decaying with the characteristic time of 20–30 ps. The almost complete recovery of the ground state is consistent with the low photochemical activity caused by the excitation of IrCl62− into the region of the near UV bands. Comparison with the recently published results on the visible excitation of the complex is presented.

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