Based on nitrogen adsorption/desorption isotherms at K (see Sec. . . for methods and Fig. S for the isotherm), the BET surface area of Ni(PyC) 2 and Ni(PyC-m-NH 2 ) 2 is m 2 /g and m 2 /g, respectively. The larger surface area of Ni(PyC-m-NH 2 ) 2 than of Ni(PyC) 2 is consistent with the geometric surface area calculated by Zeo++ (Ni(PyC) 2 :