title: A Highly Effective Strategy for Encapsulating Potassium Cations in Small Crown Ether Rings on a Dinuclear Palladium Complex.
abstract: 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.
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
authors.forename: Fátima
authors.identifier: http://orcid.org/0000-0002-4505-2360
authors.initials: F
authors.lastname: Lucio-Martínez
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
authors.forename: Brais
authors.initials: B
authors.lastname: Bermúdez
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
authors.forename: Juan M
authors.identifier: http://orcid.org/0000-0001-9930-5717
authors.initials: JM
authors.lastname: Ortigueira
authors.affiliation: Departament of Chemistry, The University of Sheffield, Sheffield, S3 7HF, UK.
authors.forename: Harry
authors.initials: H
authors.lastname: Adams
authors.affiliation: Departamento de Química Fundamental and Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, 15071 A, Coruña, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Fernández
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Pereira
authors.affiliation: Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Avenida das Ciencias s/n, 15782, Santiago de Compostela, Spain.
authors.forename: José M
authors.initials: JM
authors.lastname: Vila
keywords: crown compounds; metallacycles; palladium; potassium; sandwich complexes