title: A Hexameric Cationic Copper(II) Metallacrown as a Pertechnetate and Perrhenate Scavenger.
abstract: Materials based on the cationic copper(II) hexanuclear 18-membered metallacrown [18-MCCuII-N(2ph)-6](6+) (2phH=2-piconyl hydrazide) and tetrafluoroborate, perchlorate, nitrate, sulfate, and perrhenate anions were prepared by an easy method in aqueous medium. Single-crystal X-ray characterization of six members of this new family of complexes showed that the anions are attached to the metallacrown by direct coordination to a copper cation or by hydrogen-bonding interaction with the center of the hexamer. The stable cationic nature of the complexes and their ability to bind different anions allows them to adsorb and immobilize environmentally relevant anions such as MO4(-) (M=Tc, Re). The MO4(-) trapping capacities suggest that these materials would be useful in the treatment of oxoanionic contaminants in water.
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Instituto de Investigación Biomédica - Universidade, 36310, Vigo, Galicia, Spain.|Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193, Barcelona, Spain.
authors.forename: Sabina
authors.initials: S
authors.lastname: Rodríguez-Hermida
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Instituto de Investigación Biomédica - Universidade, 36310, Vigo, Galicia, Spain.
authors.forename: Ana Belén
authors.identifier: http://orcid.org/0000-0001-6283-6805
authors.initials: AB
authors.lastname: Lago
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Instituto de Investigación Biomédica - Universidade, 36310, Vigo, Galicia, Spain.
authors.forename: Arantxa
authors.initials: A
authors.lastname: Pino-Cuevas
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany.
authors.forename: Adelheid
authors.initials: A
authors.lastname: Hagenbach
authors.affiliation: Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009, Zaragoza, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Cañadillas-Delgado
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Instituto de Investigación Biomédica - Universidade, 36310, Vigo, Galicia, Spain.
authors.forename: Rosa
authors.identifier: http://orcid.org/0000-0002-9094-8238
authors.initials: R
authors.lastname: Carballo
authors.affiliation: Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Abram
authors.affiliation: Departamento de Química Inorgánica, Facultade de Química, Instituto de Investigación Biomédica - Universidade, 36310, Vigo, Galicia, Spain. ezequiel@uvigo.es.
authors.forename: Ezequiel M
authors.identifier: http://orcid.org/0000-0002-6012-0931
authors.initials: EM
authors.lastname: Vázquez-López
keywords: copper; crown compounds; ion exchange; rhenium; technetium