Anagostic Interactions in Alkyl-Fluorenyl-Substituted N‐Heterocyclic Carbene Complexes of Palladium(ii)

Two imidazolylidene (Im) complexes of the general formula trans-[PdX2(Im)(pyridine)] (X = Cl (2), Br (3)), in which the N-heterocyclic carbene ligand has one of its nitrogen atoms substituted by a bulky 9-propyl-9-fluorenyl group (PrF), have been prepared and fully characterised by spectroscopic met...

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Bibliographic Details
Published in:Critical studies in media communication 2020-01, Vol.73 (5&6), p.579
Main Authors: Almallah, Hamzé, Brenner, Eric, Dominique, Matt, Jahjah, Mohamad, Hijazi, Akram, Gourlaouen, Christophe
Format: Article
Language:English
Subjects:
Atomic structure
Carbenes
Chemical bonds
Chemistry
Ligands
Nitrogen atoms
NMR
Nuclear magnetic resonance
Palladium
Single crystals
Substitutes
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Summary:Two imidazolylidene (Im) complexes of the general formula trans-[PdX2(Im)(pyridine)] (X = Cl (2), Br (3)), in which the N-heterocyclic carbene ligand has one of its nitrogen atoms substituted by a bulky 9-propyl-9-fluorenyl group (PrF), have been prepared and fully characterised by spectroscopic methods and single-crystal X-ray structure analyses. In the solid state, the Im ring plane and the coordination plane of each complex are nearly orthogonal, thereby minimising the steric interactions between the N-substituents and the halide atoms. In both structures two methylenic C–H bonds sit near the dz2 axis point to the palladium atom, resulting in CH⋯Pd separations of 2.58/2.95 Å in 2 and 2.74/2.74 Å in 3. NMR measurements and DFT calculations indicate that these methylene groups are involved in anagostic CH⋯M interactions but not in significant H⋯X bonding.
ISSN:1529-5036
DOI:10.1071/CH19608