Highly cytotoxic vanadium(v) complexes of salan ligands; insights on the role of hydrolysis
作者:Lilia Reytman、Ori Braitbard、Edit Y. Tshuva
DOI:10.1039/c2dt11514j
日期:——
oxo complexes with tetradentate diaminebis(phenolato) “salan” ligands of the type LVO(OiPr) (L is salan) with different steric and electronic substitutions at the ortho and para positions to the binding phenolato moiety were synthesized and their hydrolytic stability and cytotoxicity were analyzed. With one exception bearing large steric groups, all complexes examined displayed marked cytotoxic activity
Major impact of N-methylation on cytotoxicity and hydrolysis of salan Ti(IV) complexes: sterics and electronics are intertwined
作者:Sigalit Meker、Cesar M. Manna、Dani Peri、Edit Y. Tshuva
DOI:10.1039/c1dt11108f
日期:——
A series of Ti(IV) complexes containing diamino bis(phenolato) “salan” type ligands with NH coordination were prepared, and their hydrolysis and cytotoxicity were analyzed and compared to the N-methylated analogues. Substituting methyl groups on the coordinative nitrogen donor of highly active and stable Ti(IV) salan complexes with H atoms has two main consequences: the hydrolysis rate increases and
Iron(II) Complexes with Tetradentate Bis(aminophenolate) Ligands: Synthesis and Characterization, Solution Behavior, and Reactivity with O<sub>2</sub>
作者:Christopher J. Whiteoak、Rafael Torres Martin de Rosales、Andrew J. P. White、George J. P. Britovsek
DOI:10.1021/ic1016998
日期:2010.12.6
Tetradentate bis(aminophenolate) ligands H2salanX and H2bapenX (where X refers to the para-phenolate substituent = H, Me, F, Cl) react with [FeN(SiMe3)2}2] to form iron(II) complexes, which in the presence of suitable donor ligands L (L = pyridine or THF) can be isolated as the complexes [Fe(salanX)(L)2] and [Fe(bapenX)(L)2]. In the absence of donor ligands, either mononuclear complexes, for example
Different <i>ortho</i> and <i>para</i> Electronic Effects on Hydrolysis and Cytotoxicity of Diamino Bis(Phenolato) “Salan” Ti(IV) Complexes
作者:Dani Peri、Sigalit Meker、Cesar M. Manna、Edit Y. Tshuva
DOI:10.1021/ic101693v
日期:2011.2.7
Bis(isopropoxo) Ti(IV) complexes of diamino bis(phenolato) “salan” ligands were prepared, their hydrolysis in 1:9 water/THF solutions was investigated, and their cytotoxicity toward colon HT-29 and ovarian OVCAR-1 cells was measured. In particular, electronic effects at positions ortho and para to the binding phenolato unit were analyzed. We found that para substituents of different electronic features
A high-throughput approach to lanthanide complexes and their rapid screening in the ring opening polymerisation of caprolactone
作者:Francesca M. Kerton、Adrian C. Whitwood、Charlotte E. Willans
DOI:10.1039/b406841f
日期:——
lanthanum and praseodymium, and the smaller lanthanides like ytterbium. X-ray crystalstructures of a sterically demanding chelating amine-bis((2-hydroxyaryl)methyl) ligand and a chloride bridgeddinuclear gadolinium complex are reported. The centrosymmetric molecule contains gadolinium in distorted capped trigonal prismatic environments bonded to two amine, two phenolate, one THF and two chloride
使用高通量方法已经合成了由含氮和氧的配体支撑的镧系元素络合物的库。该配合物用于ε-己内酯的开环聚合中,在某些情况下提供分子量可控且多分散性窄的聚己内酯。开发了基于21个配体和8种镧系元素试剂的文库,以确定镧系金属和配体的最佳组合。它们是通过[Ln [N(SiMe(3))(2)](3)]配合物与含有氧和氮供体的四齿双阴离子配体的氨基转移反应制备的。1 H NMR光谱用于筛选聚合活性。配位体的空间需求对聚合过程有重要影响,氮供体的类型和中心Ln(3+)离子的大小也一样。含有具有大取代基如叔戊基的芳基环的配体提供了能够进行己内酯受控聚合的物质,而较小的基团如甲基则无效。与较大的镧系元素,镧和以及较小的镧系元素(如)相比,钇和中等尺寸的镧系元素(如sa)显示出更高的活性。报道了空间上需要的螯合胺-双((2-羟基芳基)甲基)配体和氯桥联的双核g配合物的X射线晶体结构。中心对称分子在扭曲的带帽三角棱柱