Convenient synthetic access to fluorescent rhodacyclopentadienes via ligand exchange reactions
作者:Carolin Sieck、Daniel Sieh、Meike Sapotta、Martin Haehnel、Katharina Edkins、Andreas Lorbach、Andreas Steffen、Todd B. Marder
DOI:10.1016/j.jorganchem.2017.02.028
日期:2017.10
complexes by reaction of [Rh(κ2-O,O-acac)(P(p-tolyl3)2)] with α,ω-bis(arylbutadiynyl)alkanes, which gives exclusively 2,5-bis(arylethynyl)rhodacyclopentadienes, and subsequent phosphine ligand exchange. The rhodacyclopentadienes bearing P(p-tolyl3) ligands have been investigated and compared to their PMe3 analogs with regard to their photophysical properties, showing that the aromatic phosphine ligands enhance
我们以前曾报道荧光2,5-双(芳基乙炔)rhodacyclopentadienes的从反应形成的[Rh(κ 2 - ø,ö -acac)(PME 3)2 ](ACAC =乙酰丙酮)与α,ω -双(芳基丁二炔基)烷烃。然而,还从相同的反应混合物中获得了第二种异构体系列,即磷光铑联苯铑配合物,这使2,5-双(芳基乙炔基)rhodacyclopentpentenes的纯化面临挑战,并导致收率低。在此,我们描述了一种合成的协议来访问通过的[Rh反应所需的荧光铑络合物(κ 2 - ø,Ô -acac)(P(p -甲苯基3)2)]与α,ω -双(arylbutadiynyl)烷烃,其给出专门2,5-双(芳基乙炔)rhodacyclopentadienes,和随后的膦配位体交换。已经研究了带有P(对甲苯基3)配体的rhodacyclopentadienes并与它们的PMe 3类似物进行了光物理性质的比较,表明芳族膦配体增强了从单线态激发态S