title: Synthesis, structural characterization and catalysis of ruthenium(ii) complexes based on 2,5-bis(2'-pyridyl)pyrrole ligand.
abstract: Treatment of the 2,5-bis(2'-pyridyl)pyrrolato (PDP-) anion with {Ru(COD)Cl2}nin THF readily yielded [Ru(PDP)(COD)Cl] (1) in almost quantitative yield. Anion metathesis of 1 in organic solvent by NO3-and OTf-(OTf-= triflato) gave [Ru(PDP)(COD)(NO3)] (2) and [Ru(PDP)(COD)(OTf)] (3), and in aqueous solution by BF4-and PF6-afforded aqueous complexes [Ru(PDP)(COD)(H2O)](BF4) (4+·BF4-) and [Ru(PDP)(COD)(H2O)](PF6) (4+·PF6-), respectively. Treatment of 1 with PhICl2in CH2Cl2afforded 5 with halogenated pyrrole. These complexes exhibit similar structure, including one Ru(ii) atom, one 2,5-bis(2'-pyridyl)pyrrole and one monodentate anion or aqua ligand. Each Ru(ii) tightly binds to three adjacent coplanar sites of PDP-ligand to form a meridional configuration. Complex 1 with NaIO4as the oxidant in EtOAc-CH3CN-H2O (ratio = 3 : 1 : 2) proved to be highly effective in the catalytic oxidation of olefins to carbonyl products.
authors: College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China. xyyi@csu.edu.cn.
authors: Yi-Qing
authors: YQ
authors: Zhong
authors: College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China. xyyi@csu.edu.cn.
authors: Hui-Qiong
authors: HQ
authors: Xiao
authors: College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China. xyyi@csu.edu.cn.
authors: Xiao-Yi
authors: XY
authors: Yi