Phenalene is noteworthy for its propensity to generate stable anions, cations, and radicals. Quantum mechanical analyses have demonstrated that the anion, cation, and radical of phenalene possess equivalent π-electron delocalization energies . The properties have been studied and reported to exhibit remarkable physical properties. Notably, phenalene has been observed to generate a relatively stable anion, cation, and radical . Quantum mechanical studies have provided a satisfactory explanation for the observed stability of these molecules. A comprehensive report on the structural properties noted that the bond distances and their changes in the naphthalene-like fragment are similar to those of phenalene. However, changes in the C-C bond distances involving sp3-hybridized carbon atoms exhibit significant variation depending on the specific location of hydrogen addition. The disruption of aromaticity leads to the elongation of C1-C9 (1.52 Å) and C1-C2 bonds (1.50 Å), both of which correspond to a single C-C bond. This disruption also results in the localization of single and double bonds to C3-C3 (1.47 Å) and C2-C3 (1.34 Å), respectively. Furthermore, a variant with the elongation of the bonds connecting the sp3hybridized C2 is analogous (1.47 Å for C2-C1 and C2-C3), while C1-C9a and C3-C3a correspond to aromatic bonds with distances of 1.40 Å .