Abstract
Nickel(II), palladium(II), and platinum(II) complexes of 2-(3-mesitylimidazolylidenyl)pyrimidine (L), [Ni 2(μ-Cl) 2(L) 4][Ag 2Cl 4] ( 3), [Ni 2(μ-I) 2(L) 4][NiI(L) 2(CH 3CN)] 2[Ag 4I 8] ( 4), [PdCl 2(L)] ( 5), [PdI 2(L)] ( 6), and [PtCl(L) 2][AgCl 2] ( 7) have been obtained from the carbene transfer reactions of [Ag(L)Cl] ( 2). These complexes have been fully characterized by spectroscopic methods and single-crystal X-ray structure analyses. The mono(carbene)palladium and bis(carbene)platinum complexes display normal square–planar structures. Nickel complexes 3 and 4 are rare examples of paramagnetic nickel(II) complexes of N-heterocyclic carbenes having octahedral geometry.
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