Fig. 5: Effects of alkyne-π interaction on absorption and emission.
From: Unveiling the alkyne-π interaction using metal-organic cage compounds
a Fluorescence spectrum of the methanol solution of Red-1/Orange-1 (λex = 410 nm). The inset shows the appearance of the solutions under 365-nm UV exposure. b UV-visible absorption spectra of the polycrystalline powders, indicating the red-shifted absorption edge of Red-1. c Fluorescence emission spectrum of the polycrystalline powders (λex = 410 nm), with a pronounced red-shift in Red-1. The inset displays the photographs (under 365-nm UV exposure). d Fluorescence lifetime analysis, fitted with a double exponential decay model. e Visualization of the highest occupied molecular orbital (HOMO) of Red-1 and Orange-1.
