Abstract: The present work provides two new examples of supramolecular metal-organic frameworks consisting of three-dimensional extended noncovalent assemblies of wheel-shaped heptanuclear [Cu7(?-H2O)6(?3-OH)6(?-adeninato-?N3:?N9)6]2+ entities. The heptanuclear entity consists of a central [Cu(OH)6]4- core connected to six additional copper(II) metal centers in a radial and planar arrangement through the hydroxides. It generates a wheel-shaped entity in which water molecules and ?-?N3:?N9 adeninato ligands bridge the peripheral copper atoms. The magnetic characterization indicates the central copper(II) center is anti-ferromagnetically coupled to external copper(II) centers, which are ferromagnetically coupled among them leading to an S = 5/2 ground state. The packing of these entities is sustained by ?-? stacking interactions between the adenine nucleobases and by hydrogen bonds established among the hydroxide ligands, sulfate anions, and adenine nucleobases. The sum of both types of supramolecular interactions creates a rigid synthon that in combination with the rigidity of the heptameric entity generates an open supramolecular structure (40-50% of available space) in which additional sulfate and triethylammonium ions are located altogether with solvent molecules. These compounds represent an interesting example of materials combining both porosity and magnetic relevant features.
Fuente: Inorg. Chem., 2016, 55 (15), pp 7755?7763
Editorial: American Chemical Society
Fecha de publicación: 01/08/2016
Nº de páginas: 9
Tipo de publicación: Artículo de Revista
Proyecto español: MAT2013-46502-C2-1-P
Url de la publicación: https://doi.org/10.1021/acs.inorgchem.6b01231
RUBEN PEREZ AGUIRRE
MANUEL DE PEDRO DEL VALLE
LUQUE, ANTONIO M.
PÉREZ YÁÑEZ, SONIA
JESUS MARIA RODRIGUEZ FERNANDEZ