The Pd(II) Complex of a N,N’-Diallylbenzimidazol-2-ylidene Ligand

Abstract

The palladium(II) dicarbene complex trans-[PdBr2(L)2], 2 (L = 1,3-di-(2-propenyl)-benzimidazol- 2-ylidene) was synthesized from 1,3-di-(2-propenyl)-benzimidazolium bromide 1 and Pd(OAc)2 by in situ deprotonation. The X-ray structure analysis revealed a mononuclear complex with a palladium( II) center coordinated in a square-planar fashion by the two carbene functions and two bromo ligands.

Platinum (II) N‐heterocyclic carbene complexes: Synthesis, characterization and cytotoxic properties

“…This coordination plane of 1a and 1e is nearly perpendicular to the plane of the imidazolidine ring, making a dihedral angle of 78.2 (3)° and 85.7 (6)°, respectively. The Pt–C bond lengths [1.977(10), 2.047 (6) Å] are compatible with those of many other Pt (II) complexes . However, the value in 1e is shorter than that in 1a.…”

Structural Diversity of Copper(I)–N‐Heterocyclic Carbene Complexes; Ligand Tuning Facilitates Isolation of the First Structurally Characterised Copper(I)–NHC Containing a Copper(I)–Alkene Interaction

“…[17][18][19] All of the ligands possess either one or two N-allyl substituents, and have a variety of substituents with different steric and electronic properties on the second nitrogen atom.…”

Molecular Structures and Catalytic Activity of Palladium Complexes Derived from Lutidine-bridged Bis(benzimidazolin-2-ylidene) Ligands

“…Such complexes can be obtained by reaction of a transition metal complex with the free carbene [2] or by cleavage of the olefinic C=C double bond of dibenzotetraazafulvalenes with a coordinatively unsaturated transition metal complex [3]. In addition, complexes with benzimidazolin-2-ylidene ligands can be prepared by reaction of benzimidazolium salts with transition metal complexes like Pd(OAc) 2 [4], [Ir(µ-OMe)(cod)] 2 [5] or Ag 2 O [6] via an in situ deprotonation of the benzimidazolium salts followed by complex formation. Finally, complexes with benzannulated N-heterocyclic carbene ligands are obtained by intramolecular cyclization of coordinated β -functionalized isocyanides giving the NH,NH-stabilized carbene ligands which are easily N, N -dialkylated [7].…”