fig1

Figure 1. (A) FT-IR spectra analyses of CPOF-4-265 °C-X h (X = 12, 48 and 84) compared with the CPOF-4; (B) ¹³C CP-MAS NMR spectra of CPOF-4 and CPOF-4-265 °C-84 h; (C) High-resolution C 1s XPS peak of CPOF-4 (down) and CPOF-4-265 °C-84 h (top); (D) Solid-state EPR spectrum of CPOF-4 (black) and CPOF-4-265 °C-84 h (red); (E) Solid-state EPR spectrum of CPOF-5 (black) and CPOF-5-265 °C-84 h (red); (F) UV-vis DRS of CPOF-4 and CPOF-4-265 °C-X h (X = 12, 48 and 84). Inset: CPOF-4 (left) and CPOF-4-265 °C-84 h (right) immersed in THF. FT-IR: Fourier-transform infrared; EPR: electron paramagnetic resonance; DRS: diffuse reflection spectroscopy; THF: tetrahydrofuran.