title: Synthesis and structural characterization of homochiral 2D coordination polymers of zinc and copper with conformationally flexible ditopic imidazolium-based dicarboxylate ligands.
abstract: Different novel coordination polymers containing zinc, 1-4, and copper, 5-8, metals, connected via chiral imidazolium-based dicarboxylate ligands, [LR]-, were isolated by reaction between zinc acetate or copper acetate and enantiomerically pure HLRcompounds. They were characterised and structurally identified by X-ray diffraction methods (single crystal and powder). These compounds are two-dimensional homochiral coordination polymers, [M(LR)2]n, in which the metal ions are coordinated by the two carboxylate groups of [LR]-anions in a general bridging monodentate μ2-κ1-O1,κ1-O3fashion that afforded tetrahedral metal coordination environments for zinc, 1-4, and square planar for copper, 5-8, complexes. In all the compounds the 3D supramolecular architecture is constructed by non-covalent interactions between the hydrophobic parts (R groups) of the homochiral 2D coordination polymers and, in some cases, by weak C-HO non-classical hydrogen bonds that provided, in general, a dense crystal packing. DFT calculations on the [LR]-anions confirmed their conformational flexibility as ditopic linkers and this fact makes possible the formation of different coordination polymers for four-coordinated metal centers. Preliminary studies on the Zn-catalyzed synthesis of chiral α-aminophosphonates were carried out and, unfortunately, no enantioselectivity was observed in these reactions.
authors.affiliation: Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo 1203, 41071 Sevilla, Spain. montilla@us.es galindo@us.es.
authors.forename: Antonio I
authors.initials: AI
authors.lastname: Nicasio
authors.affiliation: Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo 1203, 41071 Sevilla, Spain. montilla@us.es galindo@us.es.
authors.forename: Francisco
authors.initials: F
authors.lastname: Montilla
authors.affiliation: Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain.
authors.forename: Eleuterio
authors.initials: E
authors.lastname: Álvarez
authors.affiliation: Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo 1203, 41071 Sevilla, Spain. montilla@us.es galindo@us.es.
authors.forename: Rosario P
authors.initials: RP
authors.lastname: Colodrero
authors.affiliation: Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo 1203, 41071 Sevilla, Spain. montilla@us.es galindo@us.es.
authors.forename: Agustín
authors.identifier: http://orcid.org/0000-0002-2772-9171
authors.initials: A
authors.lastname: Galindo