Cation effects on dynamics of ligand-benzylated formazanate boron and aluminium complexes

The dynamic processes present in ligand-benzylated formazanate boron and aluminium complexes are investigated using variable temperature NMR experiments and lineshape analyses. The observed difference in activation parameters for complexes containing either organic countercations (NBu 4 + ) or alkal...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2020-07, Vol.49 (26), p.994-998
Main Authors: Mondol, Ranajit, Otten, Edwin
Format: Article
Language:English
Subjects:
Aluminum
Boron
Cations
Ligands
NMR
Nuclear magnetic resonance
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Summary:The dynamic processes present in ligand-benzylated formazanate boron and aluminium complexes are investigated using variable temperature NMR experiments and lineshape analyses. The observed difference in activation parameters for complexes containing either organic countercations (NBu 4 + ) or alkali cations is rationalized on the basis of a different degree of ion-pairing in the ground state, and the data are in all cases consistent with a mechanism that involves pyramidal inversion at the nitrogens in the heterocyclic ring rather than homolytic N-C(benzyl) bond cleavage. The dynamic processes present in ligand-benzylated formazanate boron and aluminium complexes are investigated using variable temperature NMR experiments and lineshape analyses.
ISSN:1477-9226
1477-9234
DOI:10.1039/d0dt01918f