New Structural Motifs Resulting from Internal Constraints in Chelating Bis(NHC) Ligands: A Dinuclear Ruthenium(II) Complex Featuring an eta(2)-Arene Binding Mode and a Remarkable New Tetrameric Silver(I) Halide Form

作者：Simpson Peter V; Brown David H^*; Skelton Brian W; White Allan H; Baker Murray V

来源：Organometallics, 2015, 34(11): 2508-2514.

DOI：10.1021/om5012165

A novel dinuclear ruthenium(II) complex containing two ortho-xylylene-linked bis(NHC) ligands (NBC = N-heterocyclic carbene) has been synthesized via transmetalation from a silver-NHC complex. Each ruthenium atom in the dinuclear complex is chelated through the two carbene carbon atoms and, unusually, an eta(2)-bound xylylene ring, two separate bis(NHC) units being linked by a Ru(mu-Cl)(3)Ru core. The same bis(NHC) ligand has yielded a neutral tetranuclear 4:2 AgBr:bis(NHC) complex, where ligand steric constraints seemingly inhibit formation of structures derivative of the more familiar "cubane" or "step" forms, resulting In an interesting new structural type.

• 出版日期2015-6-8