Chirality Induction in Crystalline Solids Containing Sandwich-type [Ln(α2-P2W17O61)2]17– Polyoxotungstates and Proline
Authors:
- Jun IijimaJIJun Iijima
- Haruo NarukeHNHaruo Naruke
- Takanobu SanjiTSTakanobu Sanji
- 12 October 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 57 (21) , 13351-13363
Abstract
Chiral crystalline compounds of the series of [Ln(α2-P2W17O61)2]17– polyanions embracing nearly all the lanthanide (Ln) ions were successfully isolated using Pro (proline) as a chiral director. In each compound, the polyanion and Pro were associated through a stereoselective interaction involving N(H)···O hydrogen bonding. 31P NMR and circular dichroism studies revealed the induction of chirality by Pro in the racemic aqueous systems of the [Ln(α2-P2W17O61)2]17– polyanions, i.e., the Pfeiffer effect. Mechanistically, this racemization was regulated by competitive enantiomeric interactions between the l-/d-Pro and l-/d-polyanions, with only one racemization route (the on-site rotation of the [α2-P2W17O61)]10– unit) observed, independent of the nature of Ln.Keywords
Funding Information
- Japan Science Society (28-316)
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