“…The delocalized electronic systems formed by the functionalized calixarene cavity, with the substitution of electron-deficient rhodamine B moieties on the lower rim position, contributed to the occurrence of π–π* and n–π* transitions within the molecular system. 65 As a result, these transitions have an influence on the optical properties of the material. Furthermore, it was observed that the absorption and emission wavelengths, along with the intensity behavior, of the thin film state for all the compounds were slightly lower compared to the solution state.…”