Quantum chemical insight into C–H⋯F bonding interactions between noncovalently bonded ion-pairs in N-heterocyclic carbene complexes of gold(I) [(NHC*)2Au]+[PF6]−and gold(III) [(NHC*)2AuCl2]+[PF6]−

A series of neutral acridine-based gold(III)-NHC complexes containing the pentafluorophenyl (–C6F5) group were synthesized. All of the complexes were fully characterized by analytical techniques. The square planar geometry around the gold center was confirmed by X-ray diffraction analysis for complexes 1 (Trichloro [1-methyl-3-(9-acridine)imidazol-2-ylidene]gold(III)) and 2 (Chloro-bis(pentafluorophenyl)[1-methyl-3-(9-acridine)imidazol-2-ylidene]gold(III)). In both cases, the acridine rings play a key role in the crystal packing of the solid structures by mean of π–π stacking interactions, with centroid–centroid and interplanar distances being similar to those found in other previously reported acridine-based Au(I)-NHC complexes. A different reactivity when using a bulkier N-heterocyclic carbene ligand such as 1,3-bis-(2,6-diisopropylphenyl)-2-imidazolidinylidene (SIPr) was observed. While the use of the acridine-based NHC ligand led to the expected organometallic gold(III) species, the steric hindrance of the bulky SIPr ligand led to the formation of the corresponding imidazolinium cation stabilized by the tetrakis(pentafluorophenyl)aurate(III) [Au(C6F5)4]− anion. Computational experiments were carried out in order to figure out the ground state electronic structure and the binding formation energy of the complexes and, therefore, to explain the observed reactivity.

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Quantum chemical insight into C–H⋯F bonding interactions between noncovalently bonded ion-pairs in N-heterocyclic carbene complexes of gold(I) [(NHC)2Au]+[PF6]−and gold(III) [(NHC)2AuCl2]+[PF6]−

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References 116 publications

The nature of M–B and B–N bonding in iminoboryl complexes of rhodium and iridium cis,mer -[(L) 3 (Br) 2 M(B NSiMe 3 )] (L = PMe 3 , CO): Dispersion corrected DFT study

The nature of M–B and B–N bonding in iminoboryl complexes of rhodium and iridium cis,mer -[(L) 3 (Br) 2 M(B NSiMe 3 )] (L = PMe 3 , CO): Dispersion corrected DFT study

Steric and Electronic Effects in N-Heterocyclic Carbene Gold(III) Complexes: An Experimental and Computational Study

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