“…1,2,4,7,11 According to Kasha's rule, fast decay occurs in the triplet manifold to the lowest-lying triplet state (LLTS), which is the emissive state. 22 Density functional theory (DFT) 23 calculations have been extensively employed to study the geometry and electronic structure of square planar transition metal complexes of Pt(II), 17,24,25,26,27 Ni(II), 28,29 and Pd(II) 30,31 as well as those embedded in doped carbon nanocones, nanotubes and fullerenes. 22 Density functional theory (DFT) 23 calculations have been extensively employed to study the geometry and electronic structure of square planar transition metal complexes of Pt(II), 17,24,25,26,27 Ni(II), 28,29 and Pd(II) 30,31 as well as those embedded in doped carbon nanocones, nanotubes and fullerenes.…”