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Precise Distance Control and Functionality Adjustment of Frustrated Lewis Pairs in Metal–Organic Frameworks
Abstract
We report the construction of frustrated Lewis pairs (FLPs) in a metal–organic framework (MOF), where both Lewis acid (LA) and Lewis base (LB) are fixed to the backbone. The anchoring of a tritopic organoboron linker as LA and a monotopic linker as LB to separate metal oxide clusters in a tetrahedron geometry allows for the precise control of distance between them. As the type of monotopic LB linker varies, pyridine, phenol, aniline, and benzyl alcohol, a series of 11 FLPs were constructed to give fixed distances of 7.1, 5.5, 5.4, and 4.8 Å, respectively, revealed by 11B–1H solid-state nuclear magnetic resonance spectroscopy. Keeping LA and LB apart by a fixed distance makes it possible to investigate the electrostatic effect by changing the functional groups in the monotopic LB linker, while the LA counterpart remains unaffected. This approach offers new chemical environments of the active site for FLP-induced catalysis- Text
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- tetrahedron geometry allows
- tritopic organoboron linker
- b –< sup
- give fixed distances
- frustrated lewis pairs
- 11 </ sup
- fixed distance makes
- 1 </ sup
- precise distance control
- monotopic lb linker
- monotopic linker
- precise control
- lewis base
- lewis acid
- mof ),
- lb apart
- induced catalysis
- h solid
- functionality adjustment
- functional groups
- electrostatic effect
- benzyl alcohol
- active site
- 8 å
- 11 flps