کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1305746 | 975048 | 2011 | 4 صفحه PDF | دانلود رایگان |
Three types of 1,4-diazabutadiene stabilized low-valent iridium complexes, namely [IrCl(cod)(MesDAB)] (1), [IrCl(coe)(MesDAB)] (2) and [IrCl(MesDAB)2] (3), have been prepared from 1,4-bis(2,4,6-trimethylphenyl)-1,4-diaza-1,3-butadiene (MesDAB) and [IrCl(cod)]2 or [IrCl(coe)2]2, respectively. The complexes have been investigated by NMR spectroscopy and X-ray diffraction experiments. While tetra-coordinated 2 and penta-coordinated 3 maintain their solid state structure in solution, penta-coordinated 1 shows fluxional behavior. The crystal structures determined indicate strong π-backbonding towards the MesDAB ligand in all cases.
Three different low-valent iridium complexes containing 1,4-bis(2,4,6-trimethylphenyl)-1,4-diaza-1,3-butadiene (MesDAB) as ligand have been synthesized and characterized. The influence of the metal to ligand ratio as well as the effect of the olefinic co-ligand on the coordination number and the behavior in solution has been studied.Figure optionsDownload as PowerPoint slideHighlights
► Straightforward strategy for the synthesis of three types of low-valent iridium complexes bearing 1,4-diazadienes.
► Rare example of a low-valent iridium compound containing four neutral nitrogen donor atoms.
► Iridium(I) complexes containing 1,4-diazadiene ligands prefer different structures than diphosphane stabilized compounds.
Journal: Inorganic Chemistry Communications - Volume 14, Issue 10, October 2011, Pages 1612–1615