Adenine nucleobase directed supramolecular architectures based on ferrimagnetic heptanuclear copper(II) entities and benzenecarboxylate anions.

Adenine nucleobase directed supramolecular architectures based on ferrimagnetic heptanuclear copper(II) entities and benzenecarboxylate anions.
J Inorg Biochem. 2019 Oct 05;202:110865
Authors: Pascual-Colino J, Beobide G, Castillo O, Lodewyckx P, Luque A, Pérez-Yáñez S, Román P, Velasco LF
Abstract
Two planar organic anions, benzoate and benzene-1,4-dicarboxylate (terephthalate), have been selected as potential π-stacking intercalators among ferrimagnetic [Cu7(μ-adeninato)6(μ3-OH)6(μ-H2O)6]2+ heptameric discrete entities. The resulting supramolecular architecture is highly dependent on the negative charge density distribution, mainly located in the carboxylate groups of the organic anions. In this sense, the benzoate anion, with just one carboxylate group, does not allow its intercalation between the adeninato ligands as it would imply a high steric hindrance among the heptameric entities. As a consequence, these benzoate anions are located inside the voids of the crystal structure reducing the accessible volume of compound [Cu7(μ-adeninato)6(μ3-OH)6(μ-H2O)6](benzoate)2·~17H2O (1). On the contrary, the terephthalate anion, containing two carboxylate groups at opposite sites, adopts a π-stacking sandwich arrangement between two adeninato ligands that affords the porous open structure of formula [Cu7(μ-adeninato)6(μ3-OH)6(μ-H2O)6](terephthalate)·nH2O (2a, 2b; n: 12 and 24, respectively). In addition to that, the less d...

Source: Journal of Inorganic Biochemistry - October 4, 2019 Category: Biochemistry Authors: Pascual-Colino J, Beobide G, Castillo O, Lodewyckx P, Luque A, Pérez-Yáñez S, Román P, Velasco LF Tags: J Inorg Biochem Source Type: research