Figure 3

(a) Wide-angle PXRD patterns, (b) Raman spectra, (c) N₂ adsorption-desorption isotherms, (d) pore-size distributions, as estimated by the DFT method, of the C-ZIF-8, C-y and C-ZIF-67 samples. For clarity, the isotherms for C-ZIF-8 are offset by 40 cm³ · g⁻¹. The pore-size distribution curves for C-1/19, C-1/9, C-1/2, C-2/1 and C-ZIF-67 are offset vertically by 0.0075, 0.015, 0.0225, 0.03 and 0.0375 cm³ · nm⁻¹ · g⁻¹, respectively.