A Highly Effective Strategy for Encapsulating Potassium Cations in Small Crown Ether Rings on a Dinuclear Palladium Complex

作者：Lucio Martinez Fatima; Bermudez Brais; Ortigueira Juan M; Adams Harry; Fernandez Alberto; Teresa Pereira M; Vila Jose M^*

来源：Chemistry - A European Journal, 2017, 23(26): 6255-6258.

DOI：10.1002/chem.201700597

• crown compounds
• metallacycles
• potassium
• sandwich complexes
• palladium

The potential of 15-crown-5 ethers to link large cations, such as potassium, is limited by the quasi-parallel arrangement of two oxygen donor moieties upon appropriate orientation of the corresponding ether-ring-containing molecules. Substrates bearing the two crown ethers that are capable of achieving such coordination are hitherto unknown. The synthesis and isolation of a tailor-made dinuclear palladacycle bearing 15-crown-5 ether rings on the metallated phenyls offers such a possibility, providing the adequate environment for the formation of the sandwiched [K(metallacycle-15-crown-5)(2)] moiety. This synthetic strategy also culminates in the isolation of the first palladacycle able to entrap a potassium cation through bonding to two 15-crown-5 ether rings in a single molecule.

• 出版日期2017-5-5