Figure 1 (a) PXRD patterns of fresh and calculated Ni(TMBDC)(DABCO)0.5; (b) N2adsorption-desorption isotherms of Ni(TMBDC)(DABCO)0.5at 77 K
Figure 1(a) presents the comparison between the calculated and experimental PXRD patterns of the sample Ni(TMBDC)(DABCO)0.5. It can be observed that the PXRD pattern of the synthesized Ni(TMBDC)(DABCO)0.5 shows two obvious characteristic peaks at 8.1° and 9.5°, which are in good agreement with the calculated PXRD pattern, suggesting the successful synthesis of the Ni(TMBDC)(DABCO)0.5.
To assess the permanent porosity of the Ni(TMBDC)(DABCO)0.5, N2adsorption-desorption isotherms were measured at 77 K. As shown in Figure 1(b), the N2 adsorption-desorption isotherms of Ni(TMBDC)(DABCO)0.5 exhibits a characteristic type-I isotherm with steeply increasing N2 adsorption capacity at relatively low pressures and a maximum N2 uptake of 267 cm3/g at P/P0 = 1 was achieved, indicating its microporosity. Derived from the N2 isotherms, the BET surface area and total pore volume of Ni(TMBDC)(DABCO)0.5 are 940 m2/g and 0.41 cm3/g, respectively. The pore size of Ni(TMBDC)(DABCO)0.5 is uniformly 0.5 nm, as shown in Figure S2, which is amenable to kinetic diameters of C3H8 and C2H6, implying the great potential on separation of C3/C2/C1 mixture.