Herein, we report the preparation of chiral, one-dimensional coordination polymers based on trinuclear paddlewheel helices [M₃(dpa)₄] (M = Co(II) and Ni(II); dpa = the anion of 2,2'-dipyridylamine). Enantiomeric resolution of a racemic mixture of [M₃(dpa)₄] complexes was achieved by chiral recognition of the respective enantiomer by [Δ-As₂(tartrate)₂] or [Λ-As₂(tartrate)₂] in ,-dimethylformamide (DMF), affording crystalline coordination polymers formed from [(Δ-Co₃(dpa)₄)(Λ-As₂(tartrate)₂)]·3DMF (Δ-), [(Λ-Co₃(dpa)₄)(Δ-As₂(tartrate)₂)]·3DMF (Λ-), [(Δ-Ni₃(dpa)₄)(Λ-As₂(tartrate)₂)]·(4 - )DMF∙Et₂O (Δ-) or [(Λ-Ni₃(dpa)₄)(Δ-As₂(tartrate)₂)]·(4 - )DMF∙Et₂O (Λ-) 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] 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.
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| http://dx.doi.org/10.3390/polym10030311 | DOI Listing |
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