C−C Bond Cleavage of Acetonitrile by a Dinuclear Copper(II) Cryptate
作者:Tongbu Lu、Xiaomei Zhuang、Yanwu Li、Shi Chen
DOI:10.1021/ja031874z
日期:2004.4.1
The dinuclear copper(II) cryptate [Cu2L](ClO4)4 (1) cleaves the C-C bond of acetonitrile at room temperature to produce a cyanide bridged complex of [Cu2L(CN)](ClO4)3.2CH3CN.4H2O (2). The cleavage mechanism is presented on the basis of the results of the crystal structure of 2, electronic absorption spectra, ESI-MS spectroscopy, and GC spectra of 1, respectively.
双核铜 (II) 穴状化合物 [Cu2L](ClO4)4 (1) 在室温下裂解乙腈的 CC 键,生成 [Cu2L(CN)](ClO4)3.2CH3CN.4H2O (2) 的氰化物桥连络合物。裂解机理分别基于 2 的晶体结构、电子吸收光谱、ESI-MS 光谱和 1 的 GC 光谱的结果。
BRIDGED POLYCYCLIC COMPOUND BASED COMPOSITIONS FOR RENAL THERAPY
申请人:Whiteford Jeffery A.
公开号:US20100004218A1
公开(公告)日:2010-01-07
A pharmaceutically active agent, a pharmaceutically active agent carrier and method of use thereof are described. In some embodiments, a system may include a composition. The composition may include one or more bridged polycyclic compounds. At least one of the bridged polycyclic compounds may include at least two cyclic groups, and at least two pharmaceutically active agents may be associated with the bridged polycyclic compound. In some embodiments, one or more bridged polycyclic compounds may be administered to a subject to control fluid and/or waste levels.
The cytotrophoblast (CTB) cells of the human placenta have membrane receptors that bind certain cardiotonic steroids (CTS) found in blood plasma. One of these, marinobufagenin, is a key factor in the etiology of preeclampsia. Herein, we used synthetic receptors (SR) to study their effectiveness on the angiogenic profile of human first trimester CTB cells. The humanextravillous CTB cells (Sw.71) used in this study were derived from first trimester chorionic villus tissue. Culture media of CTB cells treated with ≥1 nM SR level revealed sFlt-1 (Soluble fms-like tyrosine kinase-1) was significantly increased while VEGF (vascular endothelial growth factor) was significantly decreased in the culture media (* p < 0.05 for each) The AT2 receptor (Angiotensin II receptor type 2) expression was significantly upregulated in ≥1 nM SR-treated CTB cells as compared to basal; however, the AT1 (Angiotensin II receptor, type 1) and VEGFR-1 (vascular endothelial growth factor receptor 1) receptor expression was significantly downregulated (* p < 0.05 for each). Our results show that the anti-proliferative and anti-angiogenic effects of SR on CTB cells are similar to the effects of CTS. The observed anti angiogenic activity of SR on CTB cells demonstrates that the functionalized-urea/thiourea molecules may be useful as potent inhibitors to prevent CTS-induced impairment of CTB cells.
人类胎盘的细胞滋养层细胞(CTB)具有膜受体,这些受体能结合血浆中发现的某些强心类固醇(CTS)。其中一种称为金线蛙甾醇,是子痫前期发病机制中的关键因素。本文中,我们利用合成受体(SR)来研究它们对人类孕早期CTB细胞的血管生成特征的有效性。本研究所用的外滋养层人类CTB细胞(Sw.71)源自孕早期的绒毛组织。经≥1 nM SR水平处理的CTB细胞培养基显示出可溶性酪氨酸激酶受体Fms样1(sFlt-1)显著增加,而血管内皮生长因子(VEGF)显著减少(* p < 0.05)。与基础水平相比,≥1 nM SR处理的CTB细胞中,血管紧张素II受体2型(AT2)表达显著上调;而血管紧张素II受体1型(AT1)和血管内皮生长因子受体1(VEGFR-1)的表达则显著下调(* p < 0.05)。我们的结果表明,SR对CTB细胞的抗增殖和抗血管生成作用与CTS的作用相似。SR在CTB细胞上展现的抗血管生成活性表明,功能化的脲/硫脲分子可能作为强效抑制剂,用以预防CTS诱导的CTB细胞功能障碍。
Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes
issue in solvent extraction processes used to recover uranium and plutonium. In the present study, a complexing agent is added in the aqueous nitric acid solution to bind selectively the pertechnetate anion and prevent its extraction into the organic phase or to back extract it in the aqueous phase. Several azacryptands with the addition of hydrophilic groups were synthesized to improve the solubility
在硝酸介质中以高tech酸根阴离子形式存在的tech的提取是用于回收铀和p的溶剂提取过程中的一个问题。在本研究中,将络合剂添加到硝酸水溶液中以选择性地结合高net酸酯阴离子,并防止其提取到有机相中或将其反提取到水相中。合成了几种带有亲水基团的氮杂聚糖,以改善先前研究的笼状分子在硝酸介质中的溶解度。溶剂萃取试验表明,所有合成的配体对高tech酸根都有相似的络合强度,并且能够在水相中保留该阴离子(0.5 M HNO 3)。这些配体能够克服霍夫迈斯特偏倚,并选择性结合硝酸溶液中的tech。与我们以前的工作相比,在液-液萃取条件下,氮杂聚糖的浓度可以增加三倍。使用微量量热法,单晶X射线衍射(SC-XRD),红外光谱和拉曼光谱学进行的配位研究表明,形成了具有氢键的包合物,稳定了腔体内的氧阴离子。这种溶解度的提高有望在溶剂萃取过程中引入这种大环氮杂聚糖。