Development of Multifunctional π-Conjugated Molecules Modulated by Rigid Spiro Structures

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We have developed structurally rigid spirofluorene-indenoheterocycles involving furan, thiophene, pyrrol, imidazole, and investigated their optical and electrochemi cal properties. Rigid spirofluorene structures can enhance planarity of π-conjugated substructures and thereby reduce intermolecular interaction involving π-π interaction in solid state. Through this study, we disclosed that spiro-conjugation affects optical properties of these compounds. Newly developed compounds, which bear high thermodynamic stability, were applicable to near infrared dye or white-light emitting materials.