Synthesis, spectrophotometric, voltammetric, and density functional theory studies of tetrahydro[3,2‐b]indolocarbazoles for sensing small molecules

Absorption spectra of tetrahydro[3,2‐b]indolocarbazoles (THICZs) with respective molecular property and alkyl substituents have been prerecorded in diverse solvents in the scope between 200 and 600 nm for very fewer times in the literary study. The photo‐physical behavior of liquified THICZs belonging to the existence surroundings. The solvatochromic behaviors of THICZs and solvent substance physical phenomenon can be analyzed by implementation of linear solvating energy state conception. Compound 4 shows excellent properties for sensing small molecules. The electrochemical behavior of some THICZs was investigated at carbon paste electrode where two electrode reactions were involved, irreversible oxidation‐one electron transfer and quasi‐reversible redox reactions forming phenolic followed by quinolone moiety electro active species. The density functional theory which means calculated molecular orbital energies (B3LYP/6‐31G) and HOMO‐LUMO gap/space for some presented indolocarbazoles have been performed.