Herein we presented the design, synthesis, and characterization of MOF crystal-glass composites, formed by dispersing crystalline MOFs within a MOF-glass matrix. We showed that both the coordinative bonding and chemical structure of a MIL-53 crystalline phase are preserved within the ZIF-62 glass matrix. Although the phases are separated, the interfacial interactions between the closely contacted microdomains improve the mechanical properties of the composite glass. More significantly, the high temperature open pore phase of MIL-53, which spontaneously transforms to a narrow pore upon cooling in the presence of water, is stabilized at room temperature in the crystal-glass composite. This leads to a significant improvement of CO2 adsorption capacity.
COBISS.SI-ID: 6652442
The synthesis of four novel crystalline zeolitic imidazolate framework structures using a mixed-ligand approach is reported. The inclusion of both imidazolate and halogenated benzimidazolate-derived linkers leads to glass-forming behavior by all four structures. A proportion of halogen atoms form terminal bonds with zinc upon melting, which improves mechanical properties and increases porosity of such glasses. Additionally, the required melting temperature is lower compared to non-halogenated representatives, which is favorable in fabrication of the composites with thermally unstable second component.
COBISS.SI-ID: 6793242