This PDF file includes:

• Fig. S1. ¹H NMR spectrum of polyphenylene precursor.
• Fig. S2. ¹³C NMR spectrum of polyphenylene precursor.
• Fig. S3. Bent structure of 1.
• Fig. S4. ¹H NMR spectrum of 1 in C₂D₂Cl₄.
• Fig. S5. ¹³C NMR spectrum of 1 in C₂D₂Cl₄/CS₂.
• Fig. S6. ¹H-¹H COSY spectrum of 1 in C₂D₂Cl₄.
• Fig. S7. ¹³C-¹H COSY spectrum of 1 in C₂D₂Cl₄.
• Fig. S8. H···H proximity in 1.
• Fig. S9. ¹H NMR spectra of 1 in C₂D₂Cl₄ at different concentrations.
• Fig. S10. ¹H NMR spectra of 1 in C₂D₂Cl₄ at different temperatures.
• Fig. S11. Structure of 1 (left) and 2 (right).
• Fig. S12. Time-resolved fluorescence spectrum of 1.
• Table S1. Ultraviolet-visible absorption parameters of 1 and 2.

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