Lucio-Martínez Fátima, Bermúdez Brais, Ortigueira Juan M, Adams Harry, Fernández Alberto, Pereira M Teresa, Vila José M
Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
Departament of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK.
Chemistry. 2017 May 5;23(26):6255-6258. doi: 10.1002/chem.201700597. Epub 2017 Apr 10.
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) ] 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.
15-冠-5醚连接大阳离子（如钾离子）的潜力受到相应含醚环分子适当取向时两个氧供体部分准平行排列的限制。迄今为止，尚未发现带有能够实现这种配位的两个冠醚的底物。在金属化苯基上带有15-冠-5醚环的定制双核钯环化合物的合成和分离提供了这样一种可能性，为形成夹心式[K(金属环-15-冠-5)]部分提供了适当的环境。这种合成策略还最终分离出了第一个能够通过在单个分子中与两个15-冠-5醚环键合来捕获钾阳离子的钯环化合物。
