Host-Guest Interactions Between Metal–Organic Frameworks and Air-Sensitive Complexes at High Temperature

Abstract

The host-guest chemistry of metal–organic frameworks (MOFs) has been attracting increasing attention owing to the outstanding properties derived from MOFs-guests combinations. However, there are large difficulties involved in the syntheses of the host-guest MOF systems with air-sensitive metal complexes. In addition, the behaviors on host-guest interactions in the above systems at high temperature are not clear. This study reported the synthetic methods for host-guest systems of metal–organic framework and air-sensitive metal complexes via a developed chemical vapor infiltration process. With the synchrotron X-ray powder diffraction (XRPD) measurements and Fourier Transform infrared spectroscopy (FTIR), the successful loadings of Fe(CO)5 in HKUST-1 and NH2-MIL-101(Al) have been confirmed. At high temperatures, the structural and chemical componential changes were investigated in detail by XRPD and FTIR measurements. HKUST-1 was proven to have strong interaction with Fe(CO)5 and resulted in a heavy loading amount of 63.1 wt%, but too strong an interaction led to deformation of HKUST-1 sub-unit under heating conditions. NH2-MIL-101(Al), meanwhile, has a weaker interaction and is chemically inert to Fe(CO)5 at high temperatures.

Host-guest charge transfer for scalable single crystal epitaxy of a metal-organic framework

“…MOFs can encapsulate foreign atoms, molecules and nanoparticles inside the pores. The process of the encapsulation of guest materials can be in-situ (during the synthesis of MOFs) [17][18] [19] or post-synthesis (after the synthesis of neutral MOFs) [20][21] [22][23] [24]. In the latter case, the MOF can be anionic or cationic, depending on the ionization potential/electron affinity of the guest species and of the ligand [25].…”

Improvement for the mechanical performance of boroxine‐based self‐healing polyurethane by quadruple hydrogen bonds

“…At present, self-healing polyurethane is mainly divided into external and intrinsic type according to whether introducing external substances or structure. 12,13 For intrinsic self-healing polyurethane, some dynamic reversible covalent bonds or non-covalent bonds, such as Diels-Alder(DA) bonds, [14][15][16] disulfide bonds, [17][18][19] imine bonds, [20][21][22] hydrogen bonds, [23][24][25] metal coordination, [26][27][28] and host-guest interactions, [29][30][31] are introduced into the polyurethane matrix. The dissociation and recombination of these dynamic reversible bonds can be triggered by external stimuli (such as light, heat, pH, etc.…”