Interconversion of tetrahedral [(M) 4 ∩{Mg 4 (L 1 ) 6 }]/[In 4 (L 2 ) 4 ] and cyclic [In 6 Cl 6 (L 3 ) 6 ]. Enantiotopization of diastereotopic protons monitored by means of VT 1 H NMR spectroscopy

In this review we report on the enantiomerization of tetrahedral racemic ‐[(NH 4 ) 4 ∩{Mg 4 (L 1 ) 6 }] monitored by means of variable temperature (VT) 1 H NMR spectroscopy. The enantiotopization of the diastereotopic protons is due to simultaneous Bailar twists at the four octahedrally coordinated...

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Published in:European journal of inorganic chemistry 2022-02, Vol.2022 (4)
Main Authors: Bauer, Walter, Maid, Harald, Saalfrank, Rolf W.
Format: Article
Language:English
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Summary:In this review we report on the enantiomerization of tetrahedral racemic ‐[(NH 4 ) 4 ∩{Mg 4 (L 1 ) 6 }] monitored by means of variable temperature (VT) 1 H NMR spectroscopy. The enantiotopization of the diastereotopic protons is due to simultaneous Bailar twists at the four octahedrally coordinated magnesium centres, synchronized with atropisomerization of the six edge‐bridging ligands (L 1 ) 2‐ .The VT 1 H NMR spectrum of tetrahedral meso ‐[In 4 (L 2 ) 4 ] is coined through the helicity of the four face‐centred tripodal hexadentate ligands (L 2 ) 3‐ and can, alike the 1 H NMR of cyclic meso ‐[In 6 Cl 6 (L 3 ) 6 ], be explained by the enantiotopization of the diastereotopic protons via mesomerization.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.202100694