Polymers 2018, 10(3), 311; https://doi.org/10.3390/polym10030311
Enantiopure Chiral Coordination Polymers Based on Polynuclear Paddlewheel Helices and Arsenyl Tartrate
Ángela Valentín-Pérez 1,2,3,4, Ahmad Naim 3,4
, Elizabeth A. Hillard 1,2,*
, Patrick Rosa 3,4 and Miguel Cortijo 1,2,3,4,*
, Elizabeth A. Hillard 1,2,*
, Patrick Rosa 3,4 and Miguel Cortijo 1,2,3,4,*
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)
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-TextKeywords:
chiral coordination polymers; enantiomeric resolution; extended metal atom chains; circular dichroism; X-ray crystallography
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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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