Synthesis, structural characterization and catalytic transfer hydrogenation of ruthenium(II) carbonyl complexes bearing N,N,O pincer type benzoylhydrazone ligands
作者:Pandimuni Kalpaga Suganthy、Rupesh Narayana Prabhu、Venugopal Shanmugham Sridevi
DOI:10.1016/j.poly.2014.12.016
日期:2015.3
as by elemental (C,H,N) analysis. A single crystal X-ray diffraction study of a representative complex, [Ru(L1)Cl(CO)(PPh 3 )] ( 1 ), confirms a pincer-like N,N,O coordination mode of the benzoylhydrazone ligand via the pyridine N, the azomethine N and the deprotonated amide O atoms, with the formation of two five-membered fused chelate rings, and indicates a distorted octahedral geometry around the
摘要方便地合成了四个新的通式为[Ru(L)Cl(CO)(PPh 3)]的八面体钌(II)羰基苯甲酰hydr配合物(其中HL =取代的2-乙酰基吡啶苯甲酰hydr; H表示可解离的质子)已进行了描述。通过光谱(FT-IR,1 H NMR,UV-Vis)技术以及元素(C,H,N)分析可完成对配合物的表征。代表性配合物[Ru(L1)Cl(CO)(PPh 3)](1)的单晶X射线衍射研究证实了苯甲酰hydr配体通过吡啶的类似钳状的N,N,O配位模式N,偶氮甲碱N和去质子化的酰胺O原子,形成两个五元稠合的螯合环,表明钌(II)中心周围的八面体几何形状失真。进一步,已经研究了配合物1对于取代的苯乙酮向相应的仲醇转移氢化的催化效率。还评估了碱和催化剂负载量在转移氢化反应中的影响。发现该配合物是在异丙醇/ KOH存在下的有效催化剂,转化率高达99.2%。