Cytotoxic Titanium Salan Complexes: Surprising Interaction of Salan and Alkoxy Ligands
作者:Timo A. Immel、Ulrich Groth、Thomas Huhn
DOI:10.1002/chem.200902312
日期:——
The synthesis, biochemical evaluation, and hydrolysis studies of a wide selection of alkyl‐ and halogen‐substitutedtitanium salan alkoxides are presented herein. A systematic change in the employed alkoxides revealed that both the bulk of the salan ligands and the steric demand of the labile ligands are of great importance for the obtained biological activity. Surprisingly, these two factors are not
Remarkable Stereocontrol in the Polymerization of Racemic Lactide Using Aluminum Initiators Supported by Tetradentate Aminophenoxide Ligands
作者:Pimpa Hormnirun、Edward L. Marshall、Vernon C. Gibson、Andrew J. P. White、David J. Williams
DOI:10.1021/ja038757o
日期:2004.3.1
A new family of aluminum complexes bearing tetradentate bis(aminophenoxide) ligands is reported and shown to initiate the living ring-openingpolymerization of rac-lactide. The microstructures of the polylactide products are found to be highly dependent upon the ancillary ligand substituents, ranging from highly isotactic (Pm = 0.79) to very highly heterotactic (Pr = 0.96).
Titanium complexes containing new dianionic tetradentate [ONNO]-type ligands with benzyl substituents on bridging nitrogen atoms: Syntheses, X-ray structures, and catalytic activities in ring opening polymerization of lactide
作者:So Han Kim、Junseong Lee、Da Jung Kim、Jung Hee Moon、Sungwoo Yoon、Hyung Jin Oh、Youngkyu Do、Young Soo Ko、Jin-Heong Yim、Youngjo Kim
DOI:10.1016/j.jorganchem.2009.06.037
日期:2009.10
isopropoxides 1–8 have been prepared by the reaction of Ti(O-i-Pr)4 with a series of corresponding tetradentate Salan-type [ONNO] ligands with benzyl or methyl substituents on bridging nitrogen atoms. They have been characterized by 1H NMR, 13C1H} NMR, and elemental analysis. Solid state structures of compounds 2, 4, 6, and 7 have been determined by X-ray crystallography. X-ray diffraction analysis
几个钛异丙醇盐1 - 8已经制备的Ti的反应(O-我-Pr)4与一系列对应的四齿萨兰型[ONNO]配体与桥接氮原子的苄基或甲基的取代基。它们的特征在于1 H NMR,13 C 1 H} NMR和元素分析。化合物的固态结构2,4,6,和7已通过X射线晶体学确定。X射线衍射分析和11 H NMR证实这些钛络合物都是在固态和溶液结构中具有六配位中心钛的单体种类。复合物2,4,6,和8与桥接氮的取代基的苄基,得到PLA与分子量大于化合物高1,3,5,和7与甲基取代基一样。
Synthesis and Characterization of Dinuclear Salan Rare-Earth Metal Complexes and Their Application in the Homo- and Copolymerization of Cyclic Esters
作者:Hao Ouyang、Dan Yuan、Kun Nie、Yong Zhang、Yingming Yao、Dongmei Cui
DOI:10.1021/acs.inorgchem.8b01046
日期:2018.8.6
[LLn(OC6H4-4-CH3)(THF)n]2 [n = 0 and Ln = Y (1), Sm (2), and Nd (3); n = 1 and Ln = La (4)] in good isolated yields. These complexes were fully characterized by elemental analysis, IR, and NMR spectroscopy (for complexes 1 and 4). Solid-state structures of complexes 1–4 were confirmed by single-crystal X-ray diffraction analysis. Complexes 1–4 have dinuclear solid-state structures, with a Ln2O2 core
制备了由四齿Salan配体稳定的四种稀土金属芳氧基配合物,并阐明了它们对丙交酯和ε-己内酯的(共)聚合的催化性能。(C 5 H 5)3 Ln(THF)与Salan配体N,N '-(CH 2 Ph)2 - N,N '-[CH 2(2-OH-C 6 H 2 -Me 2 -3,5)] 2(LH 2)的摩尔比为1:1,随后的p当量为1当量-甲基苯酚,得到稀土金属芳基氧化物[LLn(OC 6 H 4 -4-CH 3)(THF)n ] 2 [ n = 0和Ln = Y(1),Sm(2)和Nd(3); n = 1且Ln = La(4)]具有良好的隔离产量。这些配合物通过元素分析,IR和NMR光谱(对于配合物1和4)进行了充分表征。复合物的固态结构1 - 4通过单晶X射线衍射分析证实。复杂1 – 4具有双核固态结构,具有桥接Salan配体的Ln 2 O 2核。围绕每个金属的配位几何形状是一个复合物稍微扭曲八面体1