聚醚酮酮（PEKK）／4，4′-二苯氧基二苯砜（DPODPS）多嵌段共聚物的合成与性能

采用溶液缩聚法由酰氯端基聚醚酮酮(PEKK)齐聚物和4，4′-二苯氧基二苯砜(DPODPS)制备了PEKK／DPODPS多嵌段共聚物，用DSC、TGA等方法对共聚物进行了表征和性能测试。结果表明，随着共聚物中DPODPS含量的增加，共聚物的熔融温度逐渐降低，而其玻璃化转变温度则逐渐升高。当DPODPS质量分数在32．63％～40．73％范围内时，所得共聚物的Tg为185～193℃，比纯PEKK的Tg高出20～28℃；其Tm为322～346℃，比纯PEKK的Tm降低35～59℃，这既保持了纯PEKK的耐热性，又改善了熔融加工性能。该组成范围内的共聚物的拉伸强度(σi)为86．6～84．2MPa，拉伸模量(M)为3．1～3．4GPa，断裂伸长率(ε)为18．5％～20．3％。     

苯并[b]萘并[2'''',3'''':5,6][1,4]二噻英并[2,3-i]噻蒽-5,7,9,14,16,18-六酮的合成及其三阶非线性光学性能

以1,4-萘醌为原料,合成了含硫的醌构稠杂环化合物苯并[b]萘并[2',3':5,6][1,4]二噻英并[2,3-i]噻蒽-5,7,9,14,16,18-六酮(4),其结构经1H NMR和IR确证.采用波长为800 nm,脉宽为80 fs的Ti:Sapphire飞秒激光,运用双光束简并四波混频法测定了4的三阶非线性光学性能,结果表明,4的三阶非线性光学极化率χ(3),非线性折射率n2,分子二阶超极化率γ和响应时间分别为2.89×10-13 esu, 5.31×10-12 esu, 3.14×10-31 esu和101 fs.并分析了4的分子结构对其三阶非线性光学性能的影响.     

γ-聚谷氨酸在细胞冻存中的作用

无DMSO、无血清细胞冻存液在临床级细胞产品的冷冻保存中具有重要的应用价值。本文以K562细胞为模型,设置含10%(v/v)DMSO及胎牛血清的冻存液为阳性对照,含10%(v/v)甘油的RPMI 1640培养基冻存液为阴性对照组,含10%(v/v)甘油及0.01%(w/v)γ-PGA的RPMI 1640培养基冻存液为实验组,考察了在无DMSO、无血清细胞冻存体系中γ-聚谷氨酸对细胞的冷冻保护作用。将K562细胞以1×10^6cells/mL的密度分别悬浮在上述冻存液中,置于液氮冻存10周,检测复苏后K562的细胞复苏率、细胞形态以及复苏后细胞的扩增情况,以评判γ-聚谷氨酸在无DMSO无血清冻存液中对K562细胞的冷冻保护作用。结果显示,实验组的细胞复苏率为(83.00±3.00)%,明显高于阴性对照组的(70.33±5.51)%(p<0.05)和阳性对照组的(71.00±2.65)%(p<0.05);且实验组冻存后的细胞形态完整,冻存前后细胞的平均直径及圆度基本一致,细胞复苏后培养24h后的细胞活性为(88.83±14.29)%,明显高于阴性对照组的(67.51±5.20)%(p<0.05),与阳性对照组的(78.75±3.31)%没有显著性差异,同时复苏后细胞扩增的延滞期明显缩短。可见,在无DMSO、无血清的甘油冻存体系中添加γ-PGA可显著提高细胞的冻存效果,具有良好的实际应用价值。     

五配位Cu(Ⅰ)配合物[Cu(4′-Phtpy)(PPh_3)_2](BF_4)的合成、结构及光谱性质研究

由[Cu(MeCN)2 (PPh3)2 ](BF4 )和 4′ 苯基 2,2′:6′,2″ 三联吡啶(4′ Phtpy)在室温下反应,合成了一个新颖的具有光致发光性能的五配位配合物[Cu(4′ Phtpy)(PPh3)2 ](BF4 ).对配合物进行了X射线衍射结构表征,并进行了红外光谱、紫外可见光谱、荧光光谱等光谱学分析.晶体属单斜晶系,空间群Pn,晶胞参数:a =1 0 80 7(6)nm,b =1 0 943 (6)nm,c=2 1610(12 )nm,α =90°,β =10 2 785(10 )°,γ =90°,V =2 492(2 )nm3,Z =2,Dc=1 3 5 4g·cm-3.配合物中,Cu(Ⅰ)与 4′ Phtpy的 3个N,2个PPh3的P配位呈变形三角双锥型结构,其轴向由Cu键合联吡啶的末端 2个N所组成,赤道平面由联吡啶的中心N原子和 2个PPh3的P原子所组成     

Quantum chemical study on the one-carbon unit transfer of imidazolinium

One-carbon unit transfer reaction of folate cofactor model compound, 1-acetyl-2-methyl-imidazolinium, with 1,2-diaminobenzene has been studied theoretically with ONIOM method. The result shows that there are two pathways to complete this reaction because the imidazolinium ring has two breaking patterns. Both the two pathways have six steps. They are combination of two reactants, proton migration, break of five-membered ring, formation of benzimidazole derivate, another proton migration, and formation of final products. In each of the above pathways, the two proton migration steps have higher energy, which illuminate that the reaction is catalyzed by general acid-base. This fact agrees with the experimental results of enzymatic one-carbon unit transfer at oxidation level of formate.     

K＋I~2→K^+＋I~2^-离子对生成反应态－态几率与 选态截面的量子散射理论研 究

本文用Miller的-矩阵变分法在Aten-Lanting-Los两态势能面上计算了K＋I~2→K^+＋I~2^-电离反应的态－态几率和选态反应截面,结果表明了低电离阈能、几率的振荡行为及振动增强效应;电离截面随碰撞能及I~2振动量子数的变化规律与实验预测相吻合;讨论了反应机理。     

κ-卡拉胶热可逆凝胶的非遍历行为研究

采用散射斑纹(speckle)技术,即散射光强涨落法,研究了κ-卡拉胶(KC)热可逆凝胶的非遍历行为.证明了非遍历性的存在,并研究了浓度、温度等条件对该非遍历性的影响.结果表明:该物理凝胶存在非遍历性,并随KC浓度增加,凝胶非遍历性增大;随温度升高,凝胶非遍历性逐渐减小,直至消失.     

Ce0.63Zr0.37MnxO2复合氧化物在CH4选择性催化还原NO反应中的研究

以Ce0.63Zr0.37MnxO2复合氧化物(OSM)为载体,Pt为活性组分,制备Pt质量百分含量为1%的催化剂。考察了OSM中Mn含量对CH4催化还原NO反应的性能,并利用XRD和H2-TPR对催化剂进行了表征。结果表明Pt/OSM催化剂在有氧条件下对CH4催化还原NO具有较好的催化活性,Mn含量为10%和15%的OSM制备的催化剂活性最好。XRD结果表明,Ce0.63Zr0.37MnxO2复合氧化物以固熔体形式存在,且Pt高度分散于载体上。H2-TPR结果表明,Pt/OSM2和Pt/OSM3催化剂具有较强的可还原性能,而Pt/OSM1和Pt/OSM4催化剂的可还原性能较弱。     

还原对Ag/SiO2催化剂高效合成吲哚的影响

以Ag／SiO2作为苯胺和乙二醇一步合成吲哚的催化剂，首次研究了还原对催化剂活性和选择性的影响．结果表明，催化剂前体在150℃以下用氢气含量不超过50%(mol)的氢-氮混合气原位还原其活性和选择性较高．     

A Polymeric Iodiplumbate(Ⅱ) Templated by Conjugated Quaternary Ammonium: Synthesis, Band Structure and Optical Properties

A new lead(Ⅱ) iodide coordination polymer [(npq)(PbI3)]n 1 (npq = N-propyl- quinolinium) has been synthesized in the presence of npq as structure-directing reagent (SDA). Compound 1 crystallizes in the orthorhombic system, space group Pbca, with a = 19.158(4), b = 7.9909(16), c = 22.929(5) (A), V = 3510.2(12) (A)3, Z = 8, Dc = 2.877 g/cm3, F(000) = 2672, C12H14I3NPb, Mr = 760.14, μ(MoKα) = 14.872 mm-1, the final R = 0.0431 and wR = 0.1021 for 3678 observed reflections with I＞2σ(I). Structure determination indicates that the [PbI3]-n infinite chains in each unit cell shape the sketch of 1, which could be described as the result of face-sharing distorted PbI6 octahedra running along the b axis. Electrostatic interaction between conjugated organic counter-cations and inorganic moieties presents and contributes to the crystal packing. 1 was further characterized with IR and elemental analysis. Based on the crystal structure data, quantum chemical calculation with DFT method was used to reveal the electronic structure and optical property of 1.