3. RESULTS AND DISCUSSION
To study the effect of five heterocyclic rings and amino-ethyl-amino linker on the structure, electronic, and photophysical properties of MTPA-Pyc, we performed DFT and TDDFT calculations. The results on the structural changes are presented in section 3.1. The electronic properties, i.e. frontier orbital contours and energies, and the UV-Vis spectra of the molecules are presented in section 3.2 and 3.3, respectively.