三苦味酸根·2,2''''-二硫代二(N-氧化吡啶)合稀土(Ⅲ) 配合物的合成、表征及其抗肿瘤活性研究

据文献报导,２,２’－二硫代二（Ｎ－氧化吡啶）（简称配体Ｌ）不仅可以用在农药中抵抗生物疾病［１］,而且有着广泛的抗菌作用［２］。由于稀土元素具有特殊的药理作用［３,４］,它与配体Ｌ形成的配合物,可能表现出更特殊的生理活性。因此,我们合成六种稀土苦味酸盐与２,２’－二硫代二（Ｎ－氧化吡啶）的配合物,并对配体及配合物的抗菌活性进行了测试。结果表明,配合物对Ｌ１２１０,ＨＬ－６０人白血病细胞均有优于配体自身的抗肿瘤活性,其中Ｅｕ配合物对于ＨＬ－６０细胞,Ｌａ、Ｅｕ、Ｅｒ配合物对于Ｌ１２１０细胞均有较强…     

2,2′-二硫代二苯甲酸、2,2′-二羧苯基硫醚及含氮配体构筑的2个配合物的合成、结构与热稳定性研究(英文)

使用2,2′-二硫代二苯甲酸和2,2′-联吡啶(2,2′-bipy)、硝酸铜在水热条件下发生的原位反应合成了一个铜配合物,即[Cu2(C14H8O4S)2(C10H8N2)2](1)(C14H8O4S=2,2′-二羧苯基硫醚,C10H8N2=2,2′-联吡啶);然后又利用2,2′-二硫代二苯甲酸和菲咯啉(phen)、氯化钙在水溶液中合成了一个钙配合物,即{[Ca(C14H8O4S2)(C12H8N2)2]·(H2O)2}n(2)(C14H8O4S=2,2′-二硫代二苯甲酸根,C12H8N2=菲咯啉),并对它们分别进行了元素分析、红外光谱、热稳定性、X射线粉末衍射和X射线单晶衍射的表征。结果表明:配合物1由2,2′-二羧苯基硫醚配体连接形成了一个双核的化合物,通过氢键和氮杂环之间的π…π作用形成三维超分子网络结构。配合物2由二硫代二苯甲酸配体桥联形成了一个一维链状结构,通过氢键和氮杂环之间的π…π作用也形成三维超分子网络结构。并且,对这2个配合物的热稳定性分别进行了研究。     

二苯甲酮双缩硫代对称二氨基脲Sn（Ⅱ）、Rb（Ⅱ）配合物的电化学合成

芳香醛、酮缩氨基硫脲及其金属配合物因其具有良好的抑菌、抗癌和抗病毒的生物活性^[1-3]而受到人们的重视,以往芳香醛、酮缩氨基硫脲金属配合物的合成,大都是配体和相应金属的盐在乙醇溶液中完成,用金属阳极在含配体的非水溶剂中的电化学氧化直接合成金属配合物报道较少^[4],而非水溶剂电化学阳极溶出法是合成低价金属化合物的有效途径之一^[5]。为此,我们合成了新希夫碱二苯甲酮双缩硫代对称二氨基脲（HL）,并用金属阳极电化学氧化法合成了该配体的Sn(Ⅱ）、Rb（Ⅱ）的配合物。通过元素分析、IRF、UV等手段对配体、配合物进行了结构测定和表征。     

含硫柔性二苯甲酸及氮杂环配体的Zn(Ⅱ)和Mn(Ⅱ)配合物的合成及晶体结构

以2,2′-二硫代二苯甲酸、2,2′-联吡啶、咪唑、硝酸锌和硝酸锰为原料,使用水热方法合成了配合物[Zn(EBLA)(2,2′-bipy)(H2O)](EBLA=2,2′-二苯甲酸硫醚)(2,2′-bipy=2,2′-联吡啶)(1),自然挥发法制备了配合物[Mn(EBSA)(im)2(H2O)]n(EBSA=2,2′-二硫代二苯甲酸)(im=咪唑)(2)。利用元素分析、红外和热重分析对其进行了表征。利用X-射线单晶衍射对结构进行了测定,并研究了配合物1的荧光性质。配合物1中,2,2′-二苯甲酸硫醚是通过水热方法由2,2′-二硫代二苯甲酸发生原位反应制备,Zn2+离子是五配位的四角锥双核结构;配合物2中,Mn2+离子是六配位的变形八面体一维链状结构。配合物中存在氢键和π-π堆积等弱的分子间作用力。     

稀土(RE=Sm,Gd,Eu)乙二胺N,N-二(2-乙酰胺苯甲酸)二乙酸配合物合成、表征与性质

通过乙二胺四乙酸二酐(EDTAD)与邻氨基苯甲酸进行酰化反应,得到乙二胺N,N-二(2-乙酰胺苯甲酸)二乙酸配体(H4L),并分别与Sm、Gd和Eu稀土离子在乙醇-水溶液中反应得到系列稀土配合物.通过IR、摩尔电导率、UV、元素分析及热重-差热分析对配合物进行表征,得出配合物的化学组成为RE(HL)·3H2O(RE=Sm,Gd,Eu).IR表明,配体(H4L)形成配合物后出现了羧酸盐特有的反对称伸缩振动吸收峰vas,Coo-和对称伸缩振动吸收峰vs,Coo-,配体以羧酸根的形式与稀土离子配位.室温下测定了配合物的荧光激发光谱和发射光谱,Gd(HL)·3H2O和Sm(HL)·3H2O的荧光光谱中主要观察到配体强的发射峰,而配合物Eu(HL)·3H2O还显示Eu离子的特征发射光谱,在597 nm处5D0→7F1跃迁的发射峰最强.循环伏安法研究配合物的电化学性质表明配合物都表现出不可逆的氧化还原过程.     

含不同芳香取代基的肼基二硫代甲酸甲酯-Ga~(3+)配合物的合成及抑菌活性

设计合成了4种含不同芳香取代基团的肼基二硫代甲酸甲酯配体(2-乙酰基吡啶肼基二硫代甲酸甲酯(L1-H)、2-甲酰基吡啶肼基二硫代甲酸甲酯(L2-H)、2-甲酰基噻吩肼基二硫代甲酸甲酯(L3-H)、2-甲酰基水杨醛肼基二硫代甲酸甲酯(L4-H))的镓配合物,对它们的抑菌活性进行了测试,并讨论了配体分子中不同芳香取代基对配合物抑菌活性的影响。在模拟生理条件下,L-H与Ga3+生成较稳定的单核配合物[Ga(L1)2]NO3(1)、[Ga(L2)2]NO3(2)、[Ga(L3)2]NO3(3)、[Ga(L4)2]NO3(4),各配合物对金黄色葡萄球菌和大肠杆菌表现出比Ga(NO3)3·9H2O强的抑制活性,抑制金黄色葡萄球菌的能力高于大肠杆菌,其中,1和2的活性比相应配体高,其余2个配合物与其配体之间无明显活性差异。L1-H和L2-H分子中吡啶基的较强吸电子效应可能是1和2具有较强抑菌活性的主要原因。4种配合物抑制黑曲霉生长的活性同样高于Ga(NO3)3·9H2O,其中3最强,并显著高于L3-H,其余配合物与相应配体间无活性差异。     

二氰基二硫纶和邻菲咯啉二酮镍(Ⅱ)、铜(Ⅱ)、锌(Ⅱ)配合物的电子光谱及分子内荷移跃迁

各种均一配体的金属二硫纶[1～4]、金属二亚胺[5,6]以及二硫纶和二亚胺混合配体的金属配合物[7,8],因其具有特殊的氧化还原性和光、电、磁功能,近10多年来一直受到科学家们的高度重视.笔者的兴趣在于二氰基二硫纶(mnt2-)的过渡金属配合物,以及二氰基二硫纶和α,α′-二亚胺混合配体过渡金属配合物的合成、性质、结构和电子功能研究[9～12].这些配合物不仅本身具有优异的气敏、光敏、催化等功能性,而且也是合成金属四氮杂卟啉的前驱物[13～14]和自组装有序分子聚集体的功能元件之一[15].……     

双-(2,2''-联吡啶)和二硫烯钌(Ⅱ)混配配合物合成、光谱表征和电化学性质

近二十年来,多吡啶钌?的配合物引起了人们极大的兴趣。这类配合物的光物理、光化学和电化学性质适合作为研究电子转移和能量迁移的超分子体系的建筑块,而且在光化学分子器件（PMDs）方面具有应用前景犤１～５犦。三－（２,２'－联吡啶）钌?配合物,在可见光区具有强的金属到配体电荷转移吸收带,这种电荷转移跃迁涉及分子内的快速氧化－还原过程。当三－（２,２'－联吡啶）钌?配合物中的一个２,２'－联吡啶分子被其它配体取代后,电荷转移激发态的氧化－还原性质明显受到影响犤６,７犦。通过改变钌?中心周围的配体,可微调钌?中心的…     

4,6-二甲基嘧啶-2-硫代乙酸稀土配合物的合成、表征及抗肿瘤活性研究

报道了合成的8种4,6-二甲基嘧啶-2-硫代乙酸的稀土配合物,通过元素分析、摩尔电导、红外光谱、核磁共振氢谱和热重-差热分析,确定了配合物的组成和结构,结果表明,配合物的组成为LnL3.nH2O,其中HL=4,6-二甲基嘧啶-2-硫代乙酸,Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,n=4或5。在配合物中配体羧基脱去质子后采用螯合双齿的方式与稀土离子形成配位键,同时,配合物中含有4或5个结晶水。抗肿瘤活性研究表明,部分配合物对常见的HL-60人白血病细胞、BGC-823人胃癌细胞、Bel-7402人肝癌细胞、Hela人宫颈癌细胞的抗肿瘤活性明显强于配体。     

4-[(N-甲基-N-羟乙基)氨基]苯甲醛缩氨基硫脲及其过渡金属配合物的合成及表征

本文报道了4－[(N－甲基－N－羟乙基）氨基]苯甲醛缩氨基硫脲（HL）及其金属配合物的合成,通过元素分析、红外光谱、紫外、核磁共振对配体和配合物进行了表征。配合物的组成为ML2（M=Ni(Ⅱ）、Cu（Ⅱ）、Zn（Ⅱ）、Cd（Ⅱ）、Pd（Ⅱ）。晶体结构分析表明配体分子中除了羟乙基偏离平面外,其余各原子几乎在一个平面上。晶体结构中存在N－H…O（N1…O1）和O－H…S氢键,形成一个二维网状结构。在与金属离子配合时,配体由硫酮式转变为硫醇式作为负一价二齿配体通过S和β-N与金属离子螯合,形成稳定的中性配合物。     

Nouvelle Synthese Des 2-Thioxoethylphosphonates, 2- mercaptovinylphosphonates, 2-Phosphoryl-3-thioxopropanoates, 2-Thiomethylvinylphosphonates, 2-Thioethoxycarbonylmethylvinylphosphonates

The cyanomethylphosphonates 1 and the ethyl phosphoacetates 2 were reacted with some fluorophenylisothiocyanates to give the 2-thioxoethylphosphonates 3 in tautomeric equilibrium with the corresponding 2-mercaptovinylphosphonates 3 ′ and the 2-phosphoryl-3-thioxopropanoates 4 , respectively. Reaction of the cyanomethylphosphonates 1 with fluorophenylisothiocyanates in presence of methyliodide furnished the 2- thiometylvinylphosphonates 5 . The 2-mercaptovinylphosphonates 3 ′ reacted with ethyl chloroacetate in refluxing ethanol in the presence of triethylamine to give S-substitued derivatives 6 .     

The confirmation of accurate combination of functional and basis set for transition‐metal dimers: Fe2, Co2, Ni2, Ru2, Rh2, Pd2, Os2, Ir2, and Pt2

Eight kinds of density functionals named B3LYP, PBE1PBE, B1B95, BLYP, BP86, G96PW91, mPWPW91, and SVWN along with two different valence basis sets (LANL2DZ and CEP‐121g) are employed to study the transition‐metal dimers for the elements of group VIII. By comparing the equilibrium bond distances, vibrational frequencies, and dissociation energies of the ground state of these dimers with the available experimental values and theoretical data, we show that the “pure” DFT methods (G96PW91, BLYP, and BP86) with great‐gradient approximation always give better results relative to the hybrid HF/DFT schemes (B3LYP, PBE1PBE, and B1B95). The striking case found by us is that the G96PW91 functional, which is not tested in previous systemic studies, always predicts the dissociation energy to be well. The Ru₂ and Os₂ dimers are sensitive to not only the functionals employed but also the valence basis sets adopted. The natural bond orbital population is analyzed, and the molecular orbitals of the unpaired electrons are determined. Furthermore, our results indicate that the s and d orbitals of these dimers always hybridize with each other except for Rh₂ and Pt₂ molecules. And by analyzing the electron configuration of the bonding atom, the dissociation limit of the ground state is obtained. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 2008     

Gaseous HgH2, CdH2, and ZnH2

Gaseous HgH2, CdH2, and ZnH2 molecules were synthesized by the direct gas-phase reaction of excited mercury, cadmium, and zinc atoms with molecular hydrogen. The molecules were identified by their high-resolution infrared emission spectra, and the metal-hydrogen bond lengths were determined from the rotational analysis of the antisymmetric stretching fundamental bands.     

Zur Kenntnis der Dialkalimetalldichalkogenide β-Na2S2, K2S2, α-Rb2S2, β-Rb2S2, K2Se2, Rb2Se2, α-K2Te2, β-K2Te2 und Rb2Te2

On Dialkali Metal Dichalcogenides β-Na₂S₂, K₂S₂, α-Rb₂S₂, β-Rb₂S₂, K₂Se₂, Rb₂Se₂, α-K₂Te₂, β-K₂Te₂ and Rb₂Te₂ The first presentation of pure samples of α- and β-Rb₂S₂, α- and β-K₂Te₂, and Rb₂Te₂ is described. Using single crystals of K₂S₂ and K₂Se₂, received by ammonothermal synthesis, the structure of the Na₂O₂ type and by using single crystals of β-Na₂S₂ and β-K₂Te₂ the Li₂O₂ type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na₂O₂ type to the Li₂O₂ type will be explained by means of the examples α-/β-Na₂S₂ and α-/β-K₂Te₂. A further case of dimorphic condition as well as the monotropic phase transition of α- and β-Rb₂S₂ is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence.     

Die H-Phasen: Ti2CdC,Ti2GaC,Ti2GaN,Ti2InN,Zr2InN und Nb2GaC

Zusammenfassung Die ternären Phasen Ti₂CdC, Ti₂GaC, Ti₂GaN, Ti₂InN, Zr₂InN und Nb₂GaC werden aus Monocarbid bzw.-nitrid, Übergangsmetall und Metametall hergestellt. Die Verbindungen erweisen sich sämtlich mit Cr₂AlC (H-Phase) isotyp. Die Gitterparameter werden ermittelt.     

Synthesis of 2, 2, 5, 5-tetramethyltetrahydrothiophene

Under the conditions of the Grignard reaction, 2, 5-dimethyl-2, 5-hexanediol has been obtained from diethyl succinate. Under the action of sulfuric acid, the latter has been cyclized to 2, 2, 5, 5-tetramethyl-tetrahydrofuran which, in its turn, by treatment with phosphorus pentasulfide, has given 2, 2, 5, 5-tetramethyltetrahydrothiophene. Its reaction with methyl iodide has given 2, 2, 5, 5-tetramethyltetrahydrothiophene methiodide.     

Photolyse von 2, 2, 4, 4-Tetramethylcyclobutanon-Derivaten

The photochemical reactions of the 2, 2, 4, 4-tetramethylcyclobutanones 1–6 carrying various substituents in 3-position were investigated. The major reaction in alcoholic solution or in the presence of other protic compounds was the formation of the semicyclic acetals 7–12 . Parallel to this reaction decarbonylation occurred, leading to stable cyclopropane derivatives in some cases, depending on the substituents present. Cyclopropanes with an exocyclic double bond underwent ring opening easily or, in case of an exocyclic carbon-nitrogen double bond, added alcohol, thus forming cyclopropane O, N-ketals. Alkyl-acyl biradicals are proposed as common intermediates for both photoreactions. Based on analogy to similar photoreactions reported in the literature, the formation of the semicyclic acetals is assumed to involve a carbene intermediate.