含C60的聚电解质自组装膜微摩擦性能的研究

通过自由基引发溶液聚合反应,合成星状C₆₀-苯乙烯-丙烯酸聚合物,其钠盐作为高聚物负离子,与高聚物正离子的重氮树脂在云母上自组装成膜,利用紫外光照射反应,使膜层间连接的离子键转化成共价键.用原子力显微镜(AFM)和摩擦力显微镜(FFM)研究了不同链长和不同层数自组装膜的表面形貌及微摩擦性能.     

含磺化聚苯胺和重氮树脂自组装超薄膜的制备及其光电转换性能

具有共轭结构的高分子化合物正日益被人们所重视 ,并被应用于导电、光电、电致发光等方面的研究 [1～ 3] .聚合物较之传统的无机太阳能材料 (如硅半导体等 )具有价格低廉 ,可方便地改变结构等优点 ,其光电转换性能的研究主要集中在提高光电转化效率和可加工性能 [4 ,5]两个方面 .由于共轭高分子如聚苯胺在一般溶剂中的溶解性较差 ,人们通过合成取代聚苯胺来提高其溶解性 ,从而改善其加工性能 ,为最终提高其在功能器件中的应用提供保证 .磺化聚苯胺就是通过在苯环上引入磺酸基而使其成为一种水溶性的高聚物 .自组装技术自 1 991年由 Decher[…     

[Cu(C8H4F3O2S)2(C12H8N2)]·C3H6O的合成及其晶体结构

标题配合物 [Cu(C8H4 F3O2 S) 2 (C12 H8N2 ) ]·C3H6 O属于三斜晶系 ,空间群为P1,并测得如下晶胞参数a =10 .5 77(3) ,b =15 .72 2 (4) ,c =10 .133(2 ) ,α =94 .5 3(2 ) ,β =10 0 .81(2 ) ,γ =96 .18(2 )° ,V =16 37.0 3 3,Z =2 ,Mr =74 4.18,Dx =1.5 1× 10 6 g·m- 3,F(0 0 0 ) =5 2 6 ,μ =8 2 4cm- 1,最终偏差因子为R =0 .0 83,Rw=0 .0 74。Cu(II)与 2个 4 ,4 ,4 三氟 1 (2 噻吩基 )丁二酮 1,3中的四个氧原子和菲咯啉中的两个氮原子 ,组成了一个畸变的八面体构型。     

微波在分析化学及有机合成中的应用

综述了近10年来微波技术在分析化学和有机合成中的应用，着重介绍了微波消解在分析化学和微波辐射在有机合成反应中的应用进展。     

Synthesis,structures and magnetic properties of a series of polynuclear copper(II)‐lanthanide( III) complexes assembled with carboxylate and hydroxide ligands

Heterometallic copper(II)‐lanthanide(III) complexes have been made with a variety of exclusively O‐donor ligands including betaines (zwitterionic carboxylates) and chloroacetate, which are dinuclear CuLn, tetranuclear Cu₂Ln₂, pentanuclear C_u3Ln₂, and octadecanuclear C_u12 complexes. The results show that subtle changes in both the carboxylates and acidity of the reaction solution can cause drastic changes in the structures of the products. Magnetic studies exhibit that shielding of the Ln³⁺ 4f electrons by the outer shell electrons is very effective to preclude significant coupling interaction between the Ln³⁺ 4f electrons and Cu²⁺ 3d electrons in either a mono‐atomic hydroxide‐bridged, or a carboxylate‐bridged system.     

(XN)4R4簇合物的结构与化学键

用密度泛函理论,在B3LYP/6-311G水平上,对(XN)4R4 (X=C,Si,Ge;R=H,CH3,NH2,OH)及合成的先驱化合物(XN)2R2进行几何构型、电子结构、振动频率和化学反应焓变等进行了研究.结果表明,(RCN)4比(CNR)4更稳定.所有簇合物的零点能EZP值,R=H时最小,R=CH3时最大,R配位原子依次为C、N和O时,EZP值逐渐减小.     

蛋氨酸合成酶催化反应研究Ⅴ：5-氨基-6-（3-羟基-4-溴丁基）尿嘧啶的合成研究

报导了5-氨基-6-（3-丁烯基）尿嘧啶、5-氨基-6-（3-羟基-4-溴丁基）尿嘧 啶的合成方法。以γ-取代的β-酮脂和O-甲基异尿硫酸盐为超始物，经6-取代尿嘧 啶（3）、6-取代-5-偶氮尿嘧啶（4）和未见文献报道的中间体6，首次合成了5-氨 基-6-（3-丁烯基）尿嘧啶（5）及5-氨基-6-（3-羟基-4-溴丁基）尿嘧啶（7）。     

4‐Phenyl‐3,5‐bis(2‐pyridyl)‐4H‐1,2,4‐triazole

In the title compound, C₁₈H₁₃N₅, the two pyridyl rings form dihedral angles of 32.7 (2) and 30.1 (2)° with the triazole ring. The most favoured orientation of the pyridyl rings is that with their N atoms on opposite sides of the triazole ring directed towards the phenyl ring. π–π‐Stacking interactions involving pyridyl rings are observed along the a axis at a perpendicular distance of 3.670 (3) Å. This arrangement is further stabilized by weak intermolecular C—H?N hydrogen bonds.     

Molecular building blocks for solid‐state chalcogenides: solvothermal synthesis of [Mn(en)3]Te4 and [Fe(en)3]2(Sb2Se5)

Two new molecular metal chalcogenides, tris­(ethyl­enedi­amine‐N,N′)­manganese(II) tetratelluride, [Mn(C₂H₈N₂)₃]Te₄, (I), and bis­[tris­(ethyl­enedi­amine‐N,N′)­iron(II)] penta­seleno­diantimonate(III), [Fe(C₂H₈N₂)₃]₂(Sb₂Se₅), (II), containing the isolated molecular building blocks Te₄^2? and Sb₂Se₅^4?, have been synthesized by solvothermal reactions in an ethyl­enedi­amine solution at 433 K. The anion Te₄^2? in (I) is a zigzag oligometric chain with Te—Te bond lengths in the range 2.709–2.751 Å. There is a very short contact [3.329 (1) Å] between a pair of neighboring Te₄^2? anions. In (II), each Sb atom is surrounded by three Se atoms to give a tripodal coordination. One of the three independent Se atoms is a μ₂‐bridging ligand between two Sb atoms; the other two are terminal.     

Bis(μ‐hexa­methyl­enetetr­amine)­bis(aqua­di­bromo­cadmium)­di­aqua­di­bromo­cadmium dihydrate

The title compound, poly­[[di­aqua­di­bromo­cadmium‐μ‐(1,3,5,7‐tetra­aza­tri­cyclo[3.3.1.1^3,7]decane‐N¹:N⁵)‐aqua­cad­mium‐di‐μ‐bromo‐aqua­cadmium‐μ‐(1,3,5,7‐tetra­aza­tri­cyclo[3.3.1.1^3,7]decane‐N¹:N⁵)‐di‐μ‐bromo] dihydrate], [Cd₃­Br₆­(C₆­H₁₂­N₄)₂­(H₂O)₄]·­2H₂O, is made up of two‐dimensional neutral rectangular coordination layers. Each rectangular subunit is enclosed by a pair of Cd₃(μ₂‐Br)₆(H₂O)₃ fragments and a pair of (μ₂‐hmt)Cd(H₂O)₂Br₂(μ₂‐hmt) fragments as sides (hmt is hexa­methyl­enetetr­amine). The unique Cd^II atom in the Cd₂Br₂ ring in the Cd₃(μ₂‐Br)₆(H₂O)₃ fragment is in a slightly distorted octahedral CdNOBr₄ geometry, surrounded by one hmt ligand [2.433 (5) Å], one aqua ligand [2.273 (4) Å] and four Br atoms [2.6409 (11)–3.0270 (14) Å]. The Cd^II atom in the (μ₂‐hmt)Cd(H₂O)₂Br₂(μ₂‐hmt) fragment lies on an inversion center and is in a highly distorted octahedral CdN₂O₂Br₂ geometry, surrounded by two trans‐related N atoms of two hmt ligands [2.479 (5) Å], two trans‐related aqua ligands [2.294 (4) Å] and two trans‐related Br atoms [2.6755 (12) Å]. Adjacent two‐dimensional coordination sheets are connected into a three‐dimensional network by hydrogen bonds involving lattice water mol­ecules, and the aqua, bromo and hmt ligands belonging to different layers.