“…Systematic DFT study of the structures, properties and reactivity of (pyridine) n -MP complexes (M = Mg, Ca, Cr, Mn, Co, Ni, Cu, Zn, Ru, and Cd; n = 0, 1, or 2) was performed by Feng and co-workers [64,65]. Investigations of optical properties of MPs (M = Mg, Ni, Zn), MTPPs (M = Mg, Ni, Zn) [66], NiOMTP (OMTP = 2,3,7,8,12, 13,17,18-octakismethylthioporphyrin) [67], and NiOEP [66,68] were carried out using TDDFT [66,67] and ZINDO approaches [68]. Electronic effects of meso -tetraaza substitution and tetrabenzo annulation on the structures and optical properties in the series NiP, NiPz, NiTBP (Ni-tetrabenzoporphyrin), and NiPc were studied [69].…”