title: Unexpected proline coordination in the copper chain polymer [Cu(μ-Cl)₂(μ-DL-proline-κ²O:O')]¹∞.
abstract: In catena-poly[copper(II)-di-μ-chlorido-μ-proline-κ(2)O:O'], [CuCl2(C5H9NO2)]n, two symmetry-independent metal cations adopt distorted octahedral coordination, typical for d(9) Jahn-Teller systems. Each chloride bridge is involved in both a short and a very long interaction with a Cu(II) centre. The centrosymmetric crystal structure contains homochiral chains of opposite handedness which extend along the shortest lattice parameter (i.e. a). The O:O'-bridging coordination mode of proline, although a common motif for such complexes in general, is remarkable for Cu(II); the vast majority of amino acid derivatives of this cation are characterized by N,O-chelation.
authors.affiliation: Institut für Anorganische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany.
authors.forename: Kevin
authors.initials: K
authors.lastname: Lamberts
authors.affiliation: Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu 1, RO-011061 Bucharest, Romania.
authors.forename: Mihaela-Diana
authors.initials: MD
authors.lastname: Şerb
authors.affiliation: Institut für Anorganische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany.
authors.forename: Ulli
authors.initials: U
authors.lastname: Englert
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007477:Ions / Q000737:chemistry; D008024:Ligands; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry*; D011392:Proline / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D056831:Coordination Complexes; D007477:Ions; D008024:Ligands; D011108:Polymers; D003300:Copper; D011392:Proline; C029892:cupric chloride
keywords: bridging ligands; crystal structure; dl-proline; one-dimensional chain polymer; racemic compounds