Design
of a Humidity-Stable Metal–Organic Framework
Using a Phosphonate Monoester Ligand
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Abstract
Phosphonate monoesters are atypical
linkers for metal–organic frameworks, but they offer potentially
added versatility. In this work, a bulky isopropyl ester is used to
direct the topology of a copper(II) network from a dense to an open
framework, CALF-30. CALF-30 shows no adsorption of N<sub>2</sub> or
CH<sub>4</sub> however, using CO<sub>2</sub> sorption, CALF-30 was
found to have a Langmuir surface area of over 300 m<sup>2</sup>/g
and to be stable to conditions of 90% relative humidity at 353 K owing
to kinetic shielding of the framework by the phosphonate ester