UV-vis femtosecond transient absorption measurements were performed using an upgraded pump-probe experimental arrangement 40 derived from the original described in ref. Briefly, the laser pump excitation was generated by using an OPA (Model Palitra, Quantronix) seeded by the fundamental laser pulses at 800 nm from the Ti:Sa amplifier (Libra Coherent, 1mJ, 1kHz, 100 fs). The synchronized probe beam is a white light supercontinuum covering the 320-800 nm spectral range and generated by focusing a few µJ of the fundamental laser pulses at 800 nm into a moving CaF2 plate. Before the sample, the probe beam is split in a signal and reference beam, both passing through the sample and detected simultaneously by a liquid nitrogen-cooled CCD camera (Model Pylon, Princeton Instrument) placed in the image plane of a spectrograph. The pump-probe acquisition is controlled by a pair of synchronized optical chopper at 66 Hz and 33 Hz, placed on the probe and pump beam path, respectively. The relative direction of polarization of the pump and probe beam is set at the magic angle (54.7°). The measurements for the molecular complex and the ligand were performed using a flowing quartz cell with an internal optical path 1 mm. For the polymers in suspension, the measurements were carried out in 10 mm thick optical cell. With the flowing cell, the pump-probe cross-correlation FWHM deduced from the stimulated Raman contribution is ca. 130 fs.