Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 12, Pages 4689-4696Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja500214r
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Funding
- U.S. Army [W911NF-11-1-0229]
- Office of the Assistant Secretary of Defense for Research and Engineering, DoD/NSSEFF Program/Naval Postgraduate School [N00244-09-1-0012, N0024-4-09-1-0071]
- National Science Foundation [CHE-1149314]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1149314] Funding Source: National Science Foundation
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Herein, we report the synthesis and characterization of the first weak-link approach (WLA) supramolecular construct that employs the small molecule regulation of intermolecular hydrogen bonding interactions for the in situ control of catalytic activity. A biaryl urea group, prone to self-aggregation, was functionalized with a phosphinoalkyl thioether (P,S) hemilabile moiety and incorporated into a homoligated Pt(II) tweezer WLA complex. This urea-containing construct, which has been characterized by a single crystal X-ray diffraction study, can be switched in situ from a rigid fully closed state to a flexible semiopen state via Cl- induced changes in the coordination mode at the Pt(I) structural node. FT-IR and H-1 NMR spectroscopy studies were used to demonstrate that while extensive urea self-association persists in the flexible semiopen complex, these interactions are deterred in the rigid, fully closed complex because of geometric and steric restraints. Consequently, the urea moieties in the fully closed complex are able to catalyze a Diels-Alder reaction between cyclopentadiene and methyl vinyl ketone to generate 2-acetyl-5-norbornene. The free urea ligand and the semiopen complex show no such activity. The successful incorporation and regulation of a hydrogen bond donating catalyst in a WLA construct open the doors to a vast and rapidly growing catalogue of allosteric catalysts for applications in the detection and amplification of organic analytes.
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