Gerson Leonel1,K Jayanthi1,Joseph Marrett2,Tomislav Friiscic2,Alexandra Navrotsky1
Arizona State University1,McGill University2
Gerson Leonel1,K Jayanthi1,Joseph Marrett2,Tomislav Friiscic2,Alexandra Navrotsky1
Arizona State University1,McGill University2
Zeolitic imidazole frameworks (ZIFs), exhibit remarkable properties including high porosity, and surface area. Their high moisture stability makes them useful for industrial applications. The stabilizing effect of metal nodes (Co(II), Cu(II), and Zn(II)) across different topologies and dimensionalities (2D or 3D) remains unexplored. By employing room-temperature acid solution calorimetry, we quantify the change in enthalpy (△H<sup>0</sup><sub>f</sub>) for forming the frameworks relative to endmembers (metal oxide plus linker). Enthalpies of formation for Co-ZIF-L, Zn-ZIF-L, SOD-Co(MeIm)<sub>2</sub>, SOD-Zn(MeIm)<sub>2</sub>, <i>dia</i>-Co(MeIm)<sub>2</sub>, <i>dia</i>-Zn(MeIm)<sub>2</sub>, and <i>dia</i>-Cu(MeIm)<sub>2</sub> are -44.72 ± 0.76, -73.74 ± 0.91, -15.49 ± 0.86, -20.45 ± 0.94, -46.18 ± 0.75, -31.63 ± 1.26, and -15.03 ± 1.40 kJ.mol<sup>-1</sup>, respectively. Zn(II) has the greatest stabilizing effect in the 2D dimensionality (ZIF-L) and SOD topology. Co(II) has the greatest stabilizing effect in the <i>dia</i> topology. The stabilizing effect of metal nodes is dependent on both topology and dimensionality of the framework.