Dimerization of a mixed-carbene Pd-II dibromide complex by elemental iodine

作者：Jandl Christian; Poethig Alexander

来源：Acta Crystallographica Section C-Structural Chemistry, 2017, 73(12): 1131-+.

DOI：10.1107/S2053229617016412

• organometallic
• palladium(II) complex
• carbocyclic carbene
• dimer
• SQUEEZE
• N-heterocyclic carbene
• polyhalide
• crystal structure

A monomeric Pd-II complex bearing a mixed carbocyclic/N-heterocyclic carbene ligand and two bromides was reacted with an excess of elemental iodine, which resulted in the surprising removal of one bromide ligand and dimerization of the mixed-carbene complex to form di-mu-bromido-bis{[1-(cyclohepta-2,4,6-trien-2-yl-1-ylidene-kappa C-1)-3-(2,6-diisopropylphenyl)imidazol-2-ylidene]palladium(II)} bis-(pentaiodide) dichloromethane monosolvate, [Pd2Br2(C22H24N2)(2)](I-5)(2)center dot CH2Cl2. The dimeric complex features a slightly distorted square-planar core of two Pd-II centres bridged by two bromide ligands, which lie in the same plane as the seven- and five-membered rings of the bidentate carbene ligand. The counter-ions in the single crystal were found to be pentaiodide monoanions featuring their typical V-shape, whereas for the bulk material, a mixture of Br/I interhalides is proposed.

• 出版日期2017-12