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Dimerization of a mixed‐carbene Pd II dibromide complex by elemental iodine
Author(s) -
Jandl Christian,
Pöthig Alexander
Publication year - 2017
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229617016412
Subject(s) - carbene , dichloromethane , chemistry , bromide , ligand (biochemistry) , denticity , iodine , medicinal chemistry , iodide , palladium , monomer , crystallography , crystal structure , stereochemistry , inorganic chemistry , solvent , organic chemistry , catalysis , polymer , biochemistry , receptor
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‐μ‐bromido‐bis{[1‐(cyclohepta‐2,4,6‐trien‐2‐yl‐1‐ylidene‐κ C 1 )‐3‐(2,6‐diisopropylphenyl)imidazol‐2‐ylidene]palladium(II)} bis(pentaiodide) dichloromethane monosolvate, [Pd 2 Br 2 (C 22 H 24 N 2 ) 2 ](I 5 ) 2 ·CH 2 Cl 2 . 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.