Fluorenylethynylpyrene derivatives with strong two-photon absorption: influence of substituents on optical properties

Abstract

A series of fluorenylethynylpyrene derivatives with large two-photon absorption cross-sections (≈250–2500 GM) and good fluorescence quantum yields (<italic>Φ</italic>_fl = 0.55–0.98) and with high two-photon brightness were synthesized.