Picosecond time-resolved spectroscopic studies of a monomer—dimer system of 3,3′-diethyl thiacarbocyanne iodide in aqueous solution

Transient absorption in the blue and near-infrared and bleaching of 3,3'-diethyl thiacarbocyanine iodide monomers and dimers weres studied. The monomer excited-state lifetime is 145 ± 10 ps, the recovery time of the dimers is 460 ± 50 ps. An intermediate state with a rise time of 80 ps and decay time of 500 ps has been detected between 670 and 730 nm.