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Grinde NA, Kehoe ZR, Vang HG, Mancheski LJ, Bosch E, Southern SA, Bryce DL, Bowling NP. Rapid Access to Encapsulated Molecular Rotors via Coordination-Driven Macrocycle Formation. Chemistry 2023; 29:e202301745. [PMID: 37308699 DOI: 10.1002/chem.202301745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/07/2023] [Accepted: 06/09/2023] [Indexed: 06/14/2023]
Abstract
Macrocycle formation that relies upon trans metal coordination of appropriately placed pyridine ligands within an arylene ethynylene construct provides rapid and reliable access to molecular rotators encapsulated within macrocyclic stators. Showing no significant close contacts to the central rotators, X-ray crystallography of AgI -coordinated macrocycles provides plausibility for unobstructed rotation or wobbling of rotators within the central cavity. Solid-state 13 C NMR of PdII -coordinated macrocycles supports the notion of unobstructed movement of simple arenes in the crystal lattice. Solution 1 H NMR studies indicate complete and immediate macrocycle formation upon the introduction of PdII to the pyridyl-based ligand at room temperature. Moreover, the formed macrocycle is stable in solution; a lack of significant changes in the 1 H NMR spectrum upon cooling to -50 °C is consistent with the absence of dynamic behavior. The synthetic route to these macrocycles is expedient and modular, providing access to rather complex constructs in four simple steps involving Sonogashira coupling and deprotection reactions.
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Affiliation(s)
- Noah A Grinde
- Chemistry Department, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI, 54481, USA
| | - Zachary R Kehoe
- Chemistry Department, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI, 54481, USA
| | - Herh G Vang
- Chemistry Department, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI, 54481, USA
| | - Lucas J Mancheski
- Chemistry Department, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI, 54481, USA
| | - Eric Bosch
- Chemistry and Biochemistry Department, Missouri State University, 901 South National Avenue, Springfield, MO, 65897, USA
| | - Scott A Southern
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - David L Bryce
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Nathan P Bowling
- Chemistry Department, University of Wisconsin-Stevens Point, 2101 Fourth Avenue, Stevens Point, WI, 54481, USA
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