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Chemical structure of IR-X and optical properties of IR-808. (A) Chemical structure of IR-X and schematic of NIR-Ia and NIR-Ib fluorescence imaging. (B) UV/Vis absorption spectra, (C) NIR-Ia emission spectra (λex = 680 nm) and (D) NIR-Ib emission spectra (λex = 808 nm) of IR-808 in water. (E) NIR-Ib images and (F) fluorescence intensity of IR-808 at different concentrations (λex = 808 nm).
