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Polymers 2018, 10(3), 311; https://doi.org/10.3390/polym10030311

Enantiopure Chiral Coordination Polymers Based on Polynuclear Paddlewheel Helices and Arsenyl Tartrate

1
Centre National de la Recherche Scientifique, Centre de Recherche Paul Pascal, UMR 5031, 33600 Pessac, France
2
Université de Bordeaux, Centre de Recherche Paul Pascal, UMR 5031, 33600 Pessac, France
3
Centre National de la Recherche Scientifique, Institut de Chimie de la Matière Condensée de Bordeaux, UMR 5026, 33600 Pessac, France
4
Université de Bordeaux, Institut de Chimie de la Matière Condensée de Bordeaux, UMR 5026, 33600 Pessac, France
*
Authors to whom correspondence should be addressed.
Received: 17 February 2018 / Revised: 9 March 2018 / Accepted: 11 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Coordination Polymer)
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Abstract

Herein, we report the preparation of chiral, one-dimensional coordination polymers based on trinuclear paddlewheel helices [M3(dpa)4]2+ (M = Co(II) and Ni(II); dpa = the anion of 2,2′-dipyridylamine). Enantiomeric resolution of a racemic mixture of [M3(dpa)4]2+ complexes was achieved by chiral recognition of the respective enantiomer by [Δ-As2(tartrate)2]2− or [Λ-As2(tartrate)2]2− in N,N-dimethylformamide (DMF), affording crystalline coordination polymers formed from [(Δ-Co3(dpa)4)(Λ-As2(tartrate)2)]·3DMF (Δ-1), [(Λ-Co3(dpa)4)(Δ-As2(tartrate)2)]·3DMF (Λ-1), [(Δ-Ni3(dpa)4)(Λ-As2(tartrate)2)]·(4 − n)DMF∙nEt2O (Δ-2) or [(Λ-Ni3(dpa)4)(Δ-As2(tartrate)2)]·(4 − n)DMF∙nEt2O (Λ-2) repeating units. UV-visible circular dichroism spectra of the complexes in DMF solutions demonstrate the efficient isolation of optically active species. The helicoidal [M3(dpa)4]2+ units that were obtained display high stability towards racemization as shown by the absence of an evolution of the dichroic signals after several days at room temperature and only a small decrease of the signal after 3 h at 80 °C. View Full-Text
Keywords: chiral coordination polymers; enantiomeric resolution; extended metal atom chains; circular dichroism; X-ray crystallography chiral coordination polymers; enantiomeric resolution; extended metal atom chains; circular dichroism; X-ray crystallography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Valentín-Pérez, Á.; Naim, A.; Hillard, E.A.; Rosa, P.; Cortijo, M. Enantiopure Chiral Coordination Polymers Based on Polynuclear Paddlewheel Helices and Arsenyl Tartrate. Polymers 2018, 10, 311.

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