**2. Experimental and computational details**

Optical absorption measurements were carried out at room temperature (RT) using a Varian Cary 5G spectrophotometer. Photoluminescence excitation (PLE)

*Synthesis, Experimental and Theoretical Investigations on the Optical and Electronic Properties… DOI: http://dx.doi.org/10.5772/intechopen.103807*

measurements were recorded with Continuous-wave photoluminescence measurements (PL), which were collected on a Jobin-Yvon Fluorolog 3 spectrometer using a Xenon lamp (450 W). Quantum chemical computations were performed using density functional theory (DFT) and TDDFT methodologies of calculation [18], and using B3LYP functional coupling with the 6-31G (d) basis set [19, 20]. DFT and TDDFT methodologies of calculations are frequently used for a better description of the structural, photophysical and electronic properties of organic synthesized materials [21, 22]. The geometry of the first excited state was obtained by the re-optimization of the ground state optimized geometry with the configuration interaction singles restricted (RCIS) ab initio method (RCIS/6-31G(d))[23]. Used methodologies of calculation are implemented in Gaussian 09 program [24].
