title: Unusual dimer formation of cyclometalated ruthenium NHC p-cymene complexes.
abstract: We present the synthesis and structural characterization of novel ruthenium complexes containing C^C* cyclometalated N-heterocyclic carbene ligands, η(6)-arene (p-cymene) ligands and one bridging chlorine ion. Complexes of the general formula [Ru(p-cymene)(C^C*)Cl] were prepared via a one-pot synthesis using in situ transmetalation from the correspondent silver NHC complexes. These complexes react with sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBAr(F)4) to form dinuclear complexes of the general structure [Ru(p-cymene)(C^C*)-μ-Cl-(p-cymene)(C^C*)Ru](+)[BAr(F)4](-). Solid-state structures confirm that the pseudo-tetrahedral coordination around the metal center with the η(6)-ligand aligned perpendicularly to the C^C* ligand and the i-Pr group "atop" is retained in the bimetallic complexes.
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden, Germany. thomas.strassner@chemie.tu-dresden.de.
authors.forename: David
authors.initials: D
authors.lastname: Schleicher
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden, Germany. thomas.strassner@chemie.tu-dresden.de.
authors.forename: Alexander
authors.initials: A
authors.lastname: Tronnier
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden, Germany. thomas.strassner@chemie.tu-dresden.de.
authors.forename: Hendrik
authors.initials: H
authors.lastname: Leopold
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany. horst.borrmann@cpfs.mpg.de.
authors.forename: Horst
authors.initials: H
authors.lastname: Borrmann
authors.affiliation: Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden, Germany. thomas.strassner@chemie.tu-dresden.de.
authors.forename: Thomas
authors.initials: T
authors.lastname: Strassner
mesh_terms: D000081007:Cymenes; D019281:Dimerization; D008958:Models, Molecular; D008968:Molecular Conformation; D039821:Monoterpenes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D000081007:Cymenes; D039821:Monoterpenes; D009942:Organometallic Compounds; C007210:4-cymene; D012428:Ruthenium