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    Area of Science:

    • Organic Chemistry
    • Materials Science
    • Spectroscopy

    Background:

    • Polycyclic hydrocarbons (PHs) are crucial in organic electronics.
    • Antiaromatic systems offer unique electronic properties.
    • Extending conjugated systems can tune optoelectronic behavior.

    Purpose of the Study:

    • Synthesize novel antiaromatic polycyclic hydrocarbons, s-indaceno[2,1- a:6,5- a\]dipyrenes (IDPs).
    • Investigate the structural and optoelectronic properties of IDPs.
    • Explore the effect of peri-fusion on electronic structure and absorption spectra.

    Main Methods:

    • Four-step synthesis protocol for IDP derivatives.
    • X-ray crystallographic analysis for structural confirmation.
    • UV/vis absorption spectroscopy and cyclic voltammetry for optoelectronic characterization.

    Main Results:

    • Successful synthesis and structural elucidation of IDPs.
    • IDPs exhibit a narrow optical energy gap of 1.8 eV.
    • Absorption maxima shifted by 160 nm compared to parent indenofluorene, approaching the NIR region.
    • Excellent redox behavior with two quasi-reversible oxidation/reduction steps observed.

    Conclusions:

    • Peri-fusion of s-indacene with pyrene moieties creates planar 40 π-electron systems.
    • IDPs demonstrate tunable optoelectronic properties with potential applications in NIR-absorbing materials.
    • The antiaromatic core contributes to the observed redox behavior and spectral shifts.