Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 11, Pages 4051-4062Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00617
Keywords
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Funding
- Federal German Ministry of Education and Research (BMBF) in the project Optimat [03SF0492A/C]
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The solid-solution mixed-linker approach, where a linker is partially replaced by a similar one under retention of the isoreticular metal-organic framework (MOF) structure, offers an easy and inexpensive way to fine-tune MOF properties to design tailored compounds. A total of 10 aluminum mixed-linker MOFs, [Al(OH)(X)(a)(Y)(1-a)] (X = IPA, isophthalate; Y = FDC, 2,5-furandicarboxylate) spanning between the isostructural MOFs CAU-10-H (a = 1) and MIL-160 (a = 0), were synthesized by employing different ratios of the aforementioned linkers. CAU-10-H and MIL-160 have been reported as highly promising materials for cycling water sorption for heat transformation applications. A detailed characterization with a focus on the changes in the sorption properties for water vapor showed that the hydrophilicity is readily and easily tuned through the mixed-linker approach between the limits of MIL-160 and CAU-10-H. An increasing fraction of IPA shifts the steep increase in the S-shaped water adsorption isotherm in small steps from p/p(0) = similar to 0.05 for MIL-160 to p/p(0) = similar to 0.18 for CAU-10-H. Higher coefficient of performance (COPH) values for the mixed-linker materials over MIL-160 illustrate the well-balanced hydrophobicity/hydrophilicity of the former under the exemplary calculation conditions.
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