Ruthenium(II) complexes containing a pendant methanol amidogen induce apoptosis in SGC-7901 cells through a ROS-mediated mitochondrial dysfunction pathway

Transition Metal Chemistry - A phenanthrene derivative with a pendant methanol amidogen TFCPIP and its two ruthenium(II) complexes [Ru(phen)2(TFCPIP)](ClO4)2 (1) and [Ru(dmp)2(TFCPIP)](ClO4)2 (2)...     

Synthesis,Characterization, Electrochemical and Spectroscopic Properties of [Ru(dppt)(bpy)Cl]+ and [Ru(pta)(bpy)Cl]+

Two novel Ru^II complexes [Ru(dppt)(bpy)Cl]ClO₄ (1) and [Ru(pta)(bpy)Cl]ClO₄ (2)[dppt, pta and bpy = 3-(1,10-phenanthrolin-2-yl)-5,6-diphenyl-as-triazine, 3-(1,10-phenanthrolin-2-yl)-as-triazino[5,6-f]acenaphthylene and 2,2-bipyridine, respectively] were synthesized and characterized by elemental analysis and electrospray mass spectrometry, ¹H-n.m.r., and u.v.–vis spectroscopy. The redox properties of the complexes were examined using cyclic voltammetry. Due to the strong -accepting character of asymmetric ligands, the MLCT bands of (1) and (2) are shifted significantly to lower energies by comparison with [Ru(tpy)(bpy)Cl]⁺.     

铅锡二元合金相图实验改进

目前国内出版的物理化学实验教材一般采用石墨粉作为防止铅锡氧化的试剂来进行热分析法绘制二元合金相图,但实验存在许多问题。从热力学角度分析了以往实验存在的问题,并改用松香作为抗氧化试剂对该实验进行了改进。通过分析实验过程,介绍实验的改进方法以及取得的成效。     

界面耦合对DNA分子电荷输运性质的影响

在三维紧束缚模型下,采用传递矩阵的方法研究了不同界面耦合对DNA分子电荷输运性质的影响.结果表明：界面耦合理想时,透射率和电子定域长度都很大,分子呈现出良好的导电性;反之,透射率和电子定域长度减小,分子呈现出较差的导电性.当分子与金属电极之间理想耦合时,从伏安特性上可以看出,poly(dG)-poly(dC) DNA分子的开启电压小于poly(dA)-poly(dT) DNA分子的开启电压,并且在相同的偏压下前者的电流值要大于后者.因此,poly(dG)-poly(dC) DNA分子的导电性优于poly( 关键词： 界面耦合 透射率 定域长度 导电性     

Synthesis,characterization and in vitro antitumor behavior of a vanadium(V) complex with 4′-(3-methoxyphenyl)-2,2′:6′2″-terpyridine

A dioxovanadium(V) complex, [VO₂(moptpy)](ClO₄) (1, moptpy = 4′-(3-methoxyphenyl)2,2′:6′2″-terpyridine), was synthesized and characterized by elemental analysis, ESI-MS, UV–vis, IR, and ¹H, ¹³C, and ⁵¹V NMR. The cytotoxicity in vitro of 1 was evaluated against cancer cell lines HepG-2 (hepatocellular carcinoma), SGC-7901 (gastric carcinoma), SiHa (cervical cancer), BEL-7402 (hepatocellular), and rat PC-12 (pheochromocytoma) by the MTT method. The results demonstrated that 1 exhibits superior anticancer activity in vitro with much lower values of 50% inhibitive concentration (IC₅₀) against the selected cell lines than cisplatin, and 1 shows the highest cytotoxic activity toward SGC-7901 cells (IC₅₀ = 1.3 ± 0.1 μM) among the selected cell lines. A series of cellular morphological and staining experiments were carried out, and the results indicated that 1 can effectively induce apoptosis of SGC-7901 cells through a ROS-mediated mitochondrial dysfunction pathway. In addition, cellular incorporation and cell cycle analysis were also performed, and it was concluded from the experimental observations that 1 can efficiently enter into the cell nuclei, and the complex inhibits cell growth in SGC-7901 cell at G0/G1 phase.     

[Ru(dipn)(tpy)](ClO4)2的合成、表征、DNA结合性质及与系列化合物之比较

合成了1个含脂肪多胺的钌配合物[Ru(dipn)(tpy)](ClO₄)₂(1)(tpy和dipn分别代表2,2′∶6′2″-三联吡啶和二丙三胺),用元素分析、电喷雾质谱、紫外-可见光谱及循环伏安进行了表征。采用电子吸收光谱滴定、EB竞争荧光光谱及粘度实验研究了该化合物与小牛胸腺DNA作用的性质,并与其系列化合物[Ru(dipn)(dptp)](ClO₄)₂(2)和[Ru(dipn)(pat)](ClO₄)₂(3)(dptp=5,6-二苯基-3-(2-邻菲咯啉基)-1,2,4-三嗪;pat=3-(2-邻菲咯啉基)-1,2,4-三嗪并[5,6-f]苊)作了对比。结果表明,3个化合物1、2、3分别以静电吸引、部分插入及插入作用的模式与DNA作用,与DNA的亲和力的相对大小为：1<2<3。     

Bis(2,2′-bipyridine)cobalt(III) complexes containing asymmetric ligands: Synthesis,DNA-binding and photocleavage studies

Three new Co^III complexes: [Co(bpy)₂(pdtb)]³⁺ (1), [Co(bpy)₂(pdta)]³⁺ (2) and [Co(bpy)₂(pdtp)]³⁺ (3) have been synthesized and characterized. The DNA binding behavior of the Co^III complexes has been investigated by spectroscopic methods and viscosity measurements. The results indicate that the size and shape of the intercalated ligand have a marked effect on the binding affinity of complexes involving CT-DNA. Complexes (2) and (3) have been found to promote cleavage of plasmid pBR 322 DNA from the supercoiled form I to the open circular form II upon irradiation. Photocleavage mechanisms are proposed.     

配合物[La(pic)3(phen)2]·CH3CN的合成及晶体结构

The Lanthanum picrate complex with 1,10-phenanthroline was synthesized, whose chemical formula can be written in [La(pic)₃(phen)₂]·CH₃CN. The crystal Xray diffraction analysis shows that crystal belongs to monoclinic with space group P2₁/a and unit cell parameters:a=17.072(4),b=16.083(4),c=17.789(4),β=106.34(2)°,V=4687(4)³, Z=4,Dc=1.735g·cm³, μ=10.106cm¹,F(000)=2448,R=0.0589,Rw=0.0589. The coordination number of La³⁺ is nine. Acetonitrile, a solvent molecule is not coordinated. Between three Pic ligands, that possesses 2 bidentate forms six member ring with La. The other is unidentate ligand. As usually, phen is bidentate ligand.