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Article Dans Une Revue Australian Journal of Chemistry Année : 2020

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

Résumé

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.

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Dates et versions

hal-03716947 , version 1 (07-07-2022)

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Hamzé Almallah, Eric Brenner, Dominique Matt, Mohamad Jahjah, Akram Hijazi, et al.. Anagostic Interactions in Alkyl-Fluorenyl-Substituted N‐Heterocyclic Carbene Complexes of Palladium(II). Australian Journal of Chemistry, 2020, 73 (6), pp.579-585. ⟨10.1071/CH19608⟩. ⟨hal-03716947⟩
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