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Title

Highly Efficient NMR Enantiodiscrimination of Chiral Octanuclear Metalla-Boxes in Polar Solvent

Authors
Barry, Nicolas P.E.
Therrien, Bruno
Published in Organometallics. 2009, vol. 28, no. 16, p. 4894-4897
Abstract Self-assembly of 5,10,15,20-tetra(4-pyridyl)porphyrin (tpp-H2) and 5,10,15,20-tetra(4-pyridyl)porphyrin-Zn(II) (tpp-Zn) tetradentate panels with the dinuclear p-cymene ruthenium clips [Ru2(η6-p-PriC6H4Me)2(µ-C2O4-κO)Cl2] and [Ru2(η6-p-PriC6H4Me)2(µ-C6H2O4-κO)Cl2] (C2O4=oxalato; C6H2O4=2,5-dihydroxy-1,4-benzoquinonato) affords the cationic organometallic boxes [Ru8(η6-p-PriC6H4Me)8(µ4-tpp-H2-κN)2(µ-C2O4-κO)4]8+ ([1]8+), [Ru8-(η6-p-PriC6H4Me)8(µ4-tpp-H2-κN)2(µ-C6H2O4-κO)4]8+ ([2]8+), [Ru8(η6-p-PriC6H4Me)8(µ4-tpp-Zn-κN)2(µ-C2O4-κO)4]8+ ([3]8+), and [Ru8(η6-p-PriC6H4Me)8(µ4-tpp-Zn-κN)2(µ-C6H2O4-κO)4]8+ ([4]8+). In solution, for all these complexes, a rapid and effective enantiodifferentiation was achieved in the presence of the NMR chiral solvating agent Λ-BINPHAT anion, only 0.05 to 0.10 equiv being necessary for complete baseline-to-baseline separation of some of the proton signals of the enantiomers. To add to this highly effective discrimination, all experiments were performed in the high-polarity solvent CD3CN, a solvent traditionally not favorable for effective chiral ion-pairing phenomena.
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BARRY, Nicolas P.E. et al. Highly Efficient NMR Enantiodiscrimination of Chiral Octanuclear Metalla-Boxes in Polar Solvent. In: Organometallics, 2009, vol. 28, n° 16, p. 4894-4897. https://archive-ouverte.unige.ch/unige:7050

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Deposited on : 2010-06-18

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