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 = ∼0.05
for MIL-160 to p/p
0 =
∼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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