| 19789798 |
Zhang WZ, Han YF, Lin YJ, Jin GX: Synthesis and characterization of molecular rectangles of half-sandwich p-cymene ruthenium complexes bearing oxamidato ligands. Dalton Trans. 2009 Oct 21;(39):8426-31. Epub 2009 Aug 28.
A series of binuclear half-sandwich p-cymene ruthenium complexes bearing oxamidato ligands [(p-cymene)(2) Ru (2)(mu-N,N'-bis (aryl) oxamidato) Cl (2)] (1-3) was synthesized by the reactions of the lithium salts of oxamide with [(p-cymene) RuCl (2)](2), respectively. Treatment of the binuclear complexes (1-3) with bidentate ligands such as 4,4'-bipyridine (4,4'-bpy) and trans-1,2-bis (4-pyridyl) ethylene (bpe) in the presence of AgOTf (OTf = CF (3) SO (3)) gave the corresponding tetranuclear complexes generally formulated as [(p-cymene)(4) Ru (4)(mu-N,N'- bis (aryl) oxamidato)(2)(mu-4,4'-bpy)(2)](OTf)(4) (4a-c) and [(p-cymene)(4) Ru (4)(mu-N,N'-bis (aryl) oxamidato)(2)(mu-bpe)(2)](OTf)(4) (5a-c) in high yields. All compounds (1-3, 4a-5c) have been characterized by NMR and IR spectra and elemental analyses. The molecular structures of , and have been determined by single-crystal X-ray analyses. The molecular structures of tetranuclear complexes and showed that two binuclear fragments as building blocks were connected by 4,4'-bpy or bpe to construct a rectangular cavity with the dimensions 5.57 x 11.28 A (4a) and 5.56 x 13.65 A (5a). |
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