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Chiral molecular 4f qubits by post functionalization
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DOI：10.1039/D5QI00977D.png)
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Abstract
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We herein demonstrate the synthesis of a pair of enantiomerically pure YbIII complexes by post-functionalisation of the parent YbIII complex via condensation with an enantiomerically pure chiral amine. The enantiomeric pair is structurally characterised by single crystal and powder X-ray diffraction; showing that it crystalises in the P212121 Sohncke space group with Flack parameters close to zero; which confirms their enantiopurity. Circular Dichroism (CD) and absorption spectroscopies in the NIR reveal sharp 2F7/2 → 2F5/2 f–f transitions; with gabs values up to 0.07; indicating a chiral environment for the ytterbium centre. Furthermore; a dynamic mechanism with mixing of ligand states is shown to contribute to the CD intensity. X-band pulse Electron Paramagnetic Resonance spectroscopy; on a magnetically dilute single crystal containing 1% of YbIII complexes within the isostructural YIII diamagnetic host; reveals a phase memory time; Tm; of the electronic spin of 600 ns and that it can be coherently manipulated by microwave pulses; as evidenced by Rabi nutations.
Keywords:
YbIII complexes
chiral amine functionalisation
enantiopurity
circular dichroism
electron paramagnetic resonance
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