Exceptionally water stable heterometallic gyroidal MOFs: tuning the porosity and hydrophobicity by doping metal ions

Abstract

A strategy to improve the framework porosity and hydrophobicity of the pore surface by doping metal ions (Cu(2+), Cd(2+), or Fe(2+)) into a gyroidal MOF STU-1 has been developed. It is found that the obtained heterometallic MOFs are exceptionally water stable.

Improving MOF stability: approaches and applications

“…Employing a similar strategy, a few metal ions, including Cu 2+ , Cd 2+ , and Fe 2+ , were separately doped into a gyroidal MOF, STU-1. 91 Unlike the poor hydrostability of pure STU-1, it was found that all metal doped STU-1s retained their morphology and crystallinity even aer soaking in boiling water for 7 days. Beyond that, aer doping with metal ions, the signicantly increased surface hydrophobicity of STU-1 was proved by water vapor adsorption isotherm curves.…”

“…There may be several reasons for this: (1) the formation of stronger coordination bonds compared with pristine bonds; (2) the enhancement of the inertness of metal clusters; (3) the improvement of surface hydrophobicity. 90,91 Hence, the design principle toward the fabrication of stable mixed-metal MOFs is the replacement of existing metal ions with more inert species.…”

Efficient adsorption separation of acetylene and ethylene via supported ionic liquid on metal‐organic framework

“…Metal-organic frameworks (MOFs) or porous coordination polymers are crystalline porous materials composed of metal ions or clusters connected three-dimensionally by multi-topic organic ligands. [13][14][15][16][17][18][19][20] This hybrid architecture opens the possibility to design and synthesize a great variety of new porous materials. 21,22 As a result, MOFs are highly attractive components for advanced structures and functionalized materials for applications including catalysis, 23,24 drug delivery, 25,26 sensing, 27 and gas separation.…”

Hydrophobic Metal–Organic Frameworks: Assessment, Construction, and Diverse Applications

“…No loss of crystallinity in STU‐5 was observed by PXRD measurements after the sample was treated at 550 °C, boiling water or methanol for 24 h. The authors believed that the introduction of hydrophobic methyl groups on the pore surface resulted in the enhanced water stability of STU‐5 compared to that of STU‐1. Recently, the group reported that the hydrophobicity and water stability of STU‐1 could be improved by doping metal ions (Cu 2+ , Cd 2+ , or Fe 2+ ) into its framework . The metal ions were doped by their introduction to the synthetic reaction mixture of STU‐1, unlike some published works reporting the postsynthetic exchange of metal ions in the frameworks of MOFs .…”

“…Recently, the group reported that the hydrophobicity and water stability of STU-1 could be improved by doping metal ions (Cu 2+ , Cd 2+ , or Fe 2+ ) into its framework. [218] The metal ions were doped by their introduction to the synthetic reaction mixture of STU-1, unlike some published works reporting the postsynthetic exchange of metal ions in the frameworks of MOFs. [219,220] However, doping STU-1 with Mn 2+ , Co 2+ , and Ni 2+ by the one-pot synthesis method was found to be unsuccessful.…”