Photophysics, absorption and emission spectroscopy, UV-visible spectrophotometer , emission and excitation spectra using a double monochromator Fluorolog 2 instrument from Spex. The excited state lifetimes of systems using a TimeMaster Model TM-3/2003 apparatus from PTI.The analysis of the triplet state by measuring the flash photolysis spectra and the transient lifetimes using a Luzchem spectrometer using the 355 nm line of a YAG laser from Continuum (Serulite), and the 530 nm line from OPO module pump by the same laser (FWHM = 13 ns).