fig1

Figure 1. Preparation and optical properties of PTTP-DCns and PTTP-DCn@Ls. (A) Chemical structures of PTTP-DCns; (B) Composition diagram of PTTP-DCn@Ls; (C) Normalized absorption and fluorescence emission spectra (λ_ex = 520 nm) of PTTP-DCns in methanol; (D) Fluorescence emission spectra of 10 µM PTTP-DCns and PTTP-DCn@Ls in 1x PBS; (E) Phosphorescence emission spectra of ¹O₂ generated by PTTP-DCns and RB in deuterated PBS under 520 nm laser irradiation, and all the compounds have the same absorbance at 520 nm; (F) Fluorescence intensities of SOSG at 525 nm in the presence of PTTP-DCns, PTTP-DCn@Ls, RB, and MB after different irradiation time (white light, 10 mW·cm^-2). PTTP-DCns: Benzene-pyridothiadiazole-thienothiophene-pyridothiadiazole-benzene conjugated framework with quaternary ammonium-terminated n-carbon alkyl chains at both ends; PBS: phosphate-buffered saline; RB: Rose Bengal; SOSG: singlet oxygen sensor green; MB: methylene blue; DSPC: 1,2-distearoyl-sn-glycero-3-phosphocholine; DSPE-PEG2000: 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[amino(polyethylene glycol)-2000] (ammonium salt); PTTP-DC4/6/8: benzene-pyridothiadiazole-thienothiophene-pyridothiadiazole-benzene conjugated framework with quaternary ammonium-terminated C4/C6/C8 alkyl chains at both ends.