Catalytic transfer hydrogenation of ketones by ruthenium(II) cyclometallated complex containing para-chloroacetophenone thiosemicarbazone
作者:Devaraj Pandiarajan、Rengan Ramesh
DOI:10.1016/j.inoche.2011.02.006
日期:2011.5
Ruthenium(II) cyclometallated complex containing para-chloroacetophenone thiosemicarbazone (L) of formula [Ru(L)(CO)(PPh3)(2)] has been synthesized and characterized by elemental and spectral analyses. The thiosemicarbazone ligand coordinates to ruthenium as a terdentate C, N. and S donor generating two five membered metallacycles. The crystal structure analysis of the complex [Ru(L)(CO)(PPh3)(2)] indicates the presence of a distorted octahedral geometry. The complex shows a quasi-reversible one electron oxidation (Ru-III/Ru-II) at 0.78 V vs SCE. Further, the catalytic transfer hydrogenation of substituted acetophenones by the titled complex was carried out with conversions up to 99.3% in the presence of i-prOH/KOH. (C) 2011 Elsevier B.V. All rights reserved.
Arene ruthenium(II) p-chloroacetophenone phenylthiosemicarbazone complex mediated transfer hydrogenation of ketones
A series of cationic half-sandwich arene ruthenium(II) complexes of general formula [Ru(eta(6)-p-cymene)Cl (L)]Cl have been synthesized from the reaction of [Ru(eta(6)-p-cymene)Cl-2](2) with thiosemicarbazone derivatives (L). Characterization of the complexes were accomplished by analytical and spectral (FT-IR, UV-Vis, H-1 NMR) methods. Single crystal structure determination reveals the presence of a pseudooctahedral three-legged piano stool conformation. All the complexes exhibit a quasi-reversible one electron reduction in the range from -0.75 to -0.85 V. Further, the catalytic activity of the titled complex has been investigated in the transfer hydrogenation of ketones in the presence of isopropanol/NaOH. (C) 2010 Elsevier B.V. All rights reserved.
Ruthenium(II) mediated C–H activation of substituted acetophenone thiosemicarbazones: Synthesis, structural characterization, luminescence and electrochemical properties
solution all the complexes exhibit metal-to-ligand charge transfer transitions (MLCT) in the visible region and are emissive at roomtemperature with quantum yield of 0.001–0.005. The crystalstructure of one of the complexes [Ru(4CAP-PTSC)(CO)(AsPh3)2] (4) has been solved by single crystal X-ray crystallography and it indicates the presence of a distorted octahedral geometry in these complexes. All the complexes
在甲醇中用4'-取代的苯乙酮硫代半脲酮衍生物对[RuHCl(CO)(AsPh 3)3 ]进行甲醇回流处理,得到了一系列具有空气稳定性的,含有通式[Ru(L)(CO)的硫代氨基脲的新型钌(II)环化金属配合物。 )(AsPh 3)2 ]。4'-取代的苯乙酮硫半脲配体表现为双阴离子的齿状C,N和S供体(L),并通过芳族碳,亚胺氮和硫醇硫与钌配位。通过元素分析和光谱方法(FT-IR,UV-Vis,11 H NMR,ESI-MS)和X射线晶体学。在氯仿溶液中,所有络合物在可见光区域均表现出金属至配体的电荷转移跃迁(MLCT),并且在室温下具有0.001–0.005的量子产率发射。一种配合物[Ru(4CAP-PTSC)(CO)(AsPh 3)2 ](4)的晶体结构已通过单晶X射线晶体学解析,它表明这些配合物中存在扭曲的八面体几何形状。所有的配合物都表现出准可逆的一次电子还原(Ru II / Ru I)的范围在-0