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

Hamzé Almallah; Eric Brenner; Dominique Matt; Mohamad Jahjah; Akram Hijazi; Christophe Gourlaouen

doi:10.1071/CH19608

RESEARCH ARTICLE

Previous Contents Vol 73(6)

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

Hamzé Almallah ^A , Eric Brenner

^A ^D , Dominique Matt

^A ^D , Mohamad Jahjah ^B , Akram Hijazi ^B and Christophe Gourlaouen ^C

+ Author Affiliations

- Author Affiliations

^A Laboratoire de Chimie Inorganique Moléculaire et Catalyse, UMR 7177 CNRS, Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg Cedex, France.

^B Inorganic and Organometallic Coordination Chemistry Laboratory, Faculty of Sciences, Lebanese University, R. Hariri University Campus, Beyrouth, Hadath, Lebanon.

^C Laboratoire de Chimie Quantique, UMR 7177 CNRS, Université de Strasbourg, 4 rue Blaise Pascal, 67070 Strasbourg Cedex, France.

^D Corresponding authors. Email: eric.brenner@unistra.fr; dmatt@unistra.fr

Australian Journal of Chemistry 73(6) 579-585 https://doi.org/10.1071/CH19608
Submitted: 25 November 2019 Accepted: 4 February 2020 Published: 26 March 2020

Abstract

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

Abstract

References

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