Pd(II) complexes with mono- and bis-chelate carbene ligands tagged with pyridinium cation: Synthesis, structures, and their catalytic activities toward Heck reaction

Homoleptic Pd(II) complexes with one and two chelating di-N-heterocyclic carbene (NHC) ligands tagged with pyridinium cation, [Pd2(PyBuCCme)2Cl2](PF6)6 and [Pd (PyBuCCme)2](PF6)6 (PyBuCCme = 1,1′-di-N-(2-pyridinium)butyl-3,3′-methylenediimidazol-2,2′-diylidene), were synthesized and their square planar molecular geometry were determined by X-ray diffraction analysis. These complexes exhibited high catalytic activity toward Heck reaction in both DMF and water.

Homoleptic Pd(II) complexes with one and two chelating di-N-heterocyclic carbene (NHC) ligands tagged with pyridinium cation, [Pd2(PyBuCCme)2Cl2](PF6)6 and [Pd(PyBuCCme)2](PF6)6, were synthesized and characterized, and their square planar molecular geometry were determined. These two complexes exhibited high catalytic activity and recyclability toward Heck reaction in both DMF and water.Figure optionsDownload as PowerPoint slideHighlights
► New Pd(II) complexes with mono- and bis-chelate NHC ligands were synthesized.
► The complexes show efficient catalytic activity toward Heck reaction.
► The complexes show good recyclability for Heck reaction.