CORTIJO, Miguel; VALENTÍN-PÉREZ, Ángela; ROGALEV, Andrei; WILHELM, Fabrice; SAINCTAVIT, Philippe; ROSA, Patrick; HILLARD, Elizabeth Anne

doi:10.1002/chem.202001783

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CORTIJO, Miguel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Recherche Paul Pascal [CRPP]

VALENTÍN-PÉREZ, Ángela
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Recherche Paul Pascal [CRPP]

ROGALEV, Andrei
European Synchrotron Radiation Facility [ESRF]

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Chemistry - A European Journal. 2020, vol. 26, n° 59, p. 13363-13366

Wiley-VCH Verlag

Résumé en anglais

An original method for determining the handedness of individual non‐centrosymmetric crystals in a mixture using a tightly‐focused, circularly polarized X‐ray beam is presented. The X‐ray natural circular dichroism (XNCD) spectra recorded at the metal K‐edge on selected crystals of [Δ‐M(en)3](NO3)2 and [Λ‐M(en)3](NO3)2 (M=CoII, NiII) show extrema at the metal pre‐edge (7712 eV for Co, 8335 eV for Ni). A mapping of a collection of some 220 crystals was performed at the respective energies by using left and right circular polarizations. The difference in absorption for the two polarizations, being either negative or positive, directly yielded the handedness of the crystal volume probed by the beam. By using this technique, it was found that the addition of l‐ascorbic acid during the synthesis of [Co(en)3](NO3)2 resulted in an enantiomeric enrichment of the Λ‐isomer of 67±13 %, whereas the Ni analogue was similarly, but conversely, enriched in the Δ‐isomer (65±22 %).< Réduire

Mots clés en anglais

Chirality

Conglomerate crystallization

Coordination chemistry

X-ray absorption

X-ray optical activity

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Rapid discrimination of crystal handedness by XNCD mapping

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