Topological analyses and bond characterization of 1,3,5,7-tetra-tert-butyl-s-indacene: a weak C_sp³—H...H—C_sp²-type dihydrogen interaction

Topological analyses of experimental and theoretical calculated electron densities of 1,3,5,7-tetra-tert-butyl-s-indacene provide bond characterizations of the chemical bond and of the π-delocalization. A weak C_sp³—H...H—C_sp²-type intramolecular dihydrogen interaction (DHI) is identified through this analysis.