新奇二茂铁甲基氮C60衍生物的合成、结构

尽管目前人们对富勒烯[C₆₀]的过渡金属有机物研究较多^[1],但通过氮卡宾方式连接的C₆₀二茂铁衍生物尚未见报道。鉴于对C₆₀反应的浓厚兴趣及二茂铁的广泛应用价值^[2]我们 利用C₆₀的缺电子性^[3]将其与二茂铁甲基氮卡宾进行[1+2]环加成反应,分离并表征了一种具有齿轮式结构的新奇C₆₀二茂铁衍生物(CpFeC₅H₄CH₂N)5C₆₀(l)。     

含氮Ylide对C60的1,3—偶极环加成反应法合成含吡咯环C60…

利用肌氨酸与对位含不同取代基的苯甲醛，共轭烯烃醛类及酮类反应生成的含氮Ｙｌｉｄｅ对Ｃ６０的加成反应，合成并分离，纯化制得了一系列含不同取代基的Ｃ６０吡咯环衍生物，并用＾１ＨＮＭＲ＾１３ＣＮＭＲ，ＦＤＭＳ，ＦＴ－ＩＲ，ＵＶ－Ｖｉｓ等光谱手段确定了它们的分子结构。     

C60乙二胺衍生物铂配合物的合成及其催化硅氢化性能

C₆₀与乙二胺反应,再与氯亚铂酸钾配位,得到了一种以C₆₀衍生物为基的Pt(Ⅱ)配合物,并研究了其在烯烃与三乙氧基硅烷的硅氢加成反应中的催化性能。结果表明,该配合物为硅氢加成反应的高效催化剂,并对苯乙烯有独特的催化性能,以近100%的区域选择性得到α-加成产物。     

微波辐射下含四氢吡咯环C60衍生物的合成

以氨基酸、醛和C60 为原料在无溶剂条件下应用微波技术合成一系列含不同取代基的四氢吡咯环C60 衍生物 ,该反应在 8～ 10min内完成 ,产率 5 0 %～ 74%.     

大黄素衍生物的合成及细胞毒性研究

以天然大黄素为母体, 经化学修饰得到一系列新的含氮衍生物6～14. 通过¹H NMR, IR, MS和元素分析确定了结构. 选择口腔底癌(KB)和乳腺癌(MFC-7)两种人癌细胞株, 采用标准MTT法测定了这类大黄素衍生物的细胞毒性. 研究表明大多数衍生物都有较强的抗癌活性, 其中位置异构体7a和7b的混合物表现出最强的活性, 与母体大黄素相比较, 活性分别提高了174倍(KB)和133倍(MFC-7).     

含氮Ylide对C_(60)的1,3-偶极环加成反应法合成含吡咯环C_(60)衍生物

利用肌氨酸与对位含不同取代基的苯甲醛、共轭烯烃醛类及酮类反应生成的含氮Ylide对C60的加成反应，合成并分离、纯化制得了一系列含不同取代基的C60吡咯环纯衍生物，并用1HNMR、13CNMR、FDMS、FT－IR、UV－Vis等光谱手段确定了它们的分子结构．     

1,2-H(XPhCH2)C60衍生物中取代基团对NMR及电化学性质的影响

为了考察取代基团对C60衍生物性质的影响,分别进行了一系列1,2-H(XPhCH2)C60(X=H,o-CH3,m-CH3,p-CH3,o-Br,m-Br,p-Br)的1H NMR、13C NMR和电化学循环伏安测试。 结果表明,邻位取代基团对苄基中亚甲基氢原子和碳原子的核磁响应具有较大的影响,而取代基团位置对C60-H和C60sp3碳原子核磁响应影响较小;在循环伏安中,苄基上的-CH3和-Br基团位置对C60衍生物的氧化还原电势并未表现出显著影响,但与1,2-H(PhCH2)C60相比,所有具有CH3PhCH2-基团的化合物氧化还原电势均表现出负移,而具有BrPhCH2-基团的化合物氧化还原电势均表现出正移,表明诱导效应是影响C60衍生物性质的主要因素,因此,可通过调控衍生物的电子结构来探究其性质。     

C60吡咯烷羧酸衍生物的合成及其清除超氧阴离子自由基（O ）的活性

亚氨基二乙酸酯(NH(CH2COOR) 2 ,R=Me、Et、t-Bu)与C60的光化学反应制得C60吡咯烷衍生物2,产率为 55%～36% (基于已反应的C60),反应活性与R基的空间效应有关,反应活性的顺序为R=Me＞Et＞t-Bu. C60吡咯烷衍生物2(R=Me)用NaH、CH3OH水解后,经盐酸酸化得相应的羧酸衍生物3,产率为65%(基于C60吡咯烷衍生物2). C60吡咯烷衍生物2和3的结构为1H NMR、13C NMR、IR和元素分析所证实. 用化学发光法检测了C60羧酸衍生物3对邻苯三酚自氧化产生的超氧阴离子(O2-·)的清除效果. 结果表明,C60羧酸衍生物3能有效地清除O2-· ,并且有明显的量效关系. 当C60羧酸衍生物3浓度为0.3 mmol/L时,清除效率可达70%. 讨论了结构因素对C60衍生物清除活性的影响.     

胱胺衍生物的合成及抗非小细胞肺癌活性研究

为寻求活性强的非小细胞肺癌(NSCLC)药物,设计合成了一系列胱胺衍生物4a～4g,并对其抗NSCLC活性进行了初步探讨。以胱胺为起始原料,经过加成、还原反应得到了目标化合物,采用CCK-8法对其抗NSCLC细胞增殖活性进行了测试。目标化合物4a～4g结构经ESI-MS、¹H-NMR、¹³C-NMR谱确证。活性结果表明,目标化合物对NCI-H520细胞增殖具有不同程度的抑制活性(IC₅₀值为44.1、38.1、49.3、40.1、38.8、12.6、5.9μmol/L),其中化合物4f和4g的抑制活性优于对照药物吉非替尼(IC₅₀值为29.7μmol/L)。化合物4f和4g(IC₅₀值为12.6、5.9μmol/L)抗NCI-H520细胞增殖活性较强,值得深入研究。     

Amino‐Functionalized Cellulose Nanoparticles: Preparation,Characterization, and Interactions with Living Cells

Spherical nanoparticles with sizes from 80 to 200 nm are obtained by self‐assembly of highly functionalized 6‐deoxy‐6‐(ω‐aminoalkyl)aminocellulosecarbamates. The particles are very stable, nontoxic, and possess primary amino groups that are accessible to further modifications in aqueous suspension. The particles can be labeled with rhodamine B isothiocyanate without changing their size, stability, and shape. The nanoparticles obtained are investigated by means of photo correlation spectroscopy, zeta potential measurements, SEM and fluorescence spectroscopy. Incorporation of the nanoparticles in human foreskin fibroblasts BJ‐1‐htert and breast carcinoma MCF‐7 cells without any transfection reagent is proved by means of confocal laser scanning microscopy.

     

Synthesis of C60‐containing polyphosphazenes from a new reactive macromolecular intermediate: Polyphophazene azides

A novel synthetic strategy was developed to prepare polyphosphazenes containing C₆₀ moieties as side chains. Thus, a new reactive macromolecular intermediate, polyphosphazene azides ( P1 ), was obtained from poly(dichlorophosphazene) by the direct nucleophilic substitution reaction. Then the azide group in P1 reacted with C₆₀ molecules to afford the first example of C₆₀‐containing polyphosphazenes ( P2 and P3 ). The polymers are soluble in common organic solvents. Molecular structural characterization for the polymers was presented by ¹H NMR, ¹³C NMR, IR, ultraviolet–visible spectra, and gel permeation chromatography. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 194–199, 2004     

Poly(L‐lactide)/C60 nanocomposites: Effects of C60 on crystallization of poly(L‐lactide)

The effects of solvent type and concentration of C₆₀ on the crystallization of poly(L ‐lactide) (PLLA) during solvent evaporation, heating from room temperature, and cooling from the melt were investigated by polarized optical microscopy and differential scanning calorimetry. The addition of C₆₀ enhanced the PLLA crystallization during solvent evaporation, during heating of the melt‐quenched films, and during cooling from the melt of As‐cast films, except for heating and cooling of the PLLA film with 1 wt % of C₆₀ prepared with dichloromethane. In the case of solvent evaporation, the difference in crystallinity between the PLLA films with and without C₆₀ became higher for the solvent with a lower boiling point. In the case of heating of melt‐quenched films, the addition of C₆₀ had a small effect on the crystallinity of PLLA, whereas significantly lowered the peak top and ending temperatures of cold crystallization, except for melt‐quenched PLLA film with 1 wt % of C₆₀ prepared with dichloromethane. The crystallinity of PLLA was determined by the solvent type, rather than by the C₆₀ concentration. In the case of cooling from the melt of As‐cast films, the addition of C₆₀ elevated the crystallinity and cold crystallization temperature values of PLLA films, except for PLLA films prepared with dichloromethane. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 2167–2176, 2007     

Synthesis and Photophysical Properties of C60‐carbazole Adducts

Three C₆₀‐carbazole adducts have been synthesized by 1, 3‐dipolar cycloaddition reaction. Intramolecular energy/electron transfer from carbazole to C₆₀ was observed by steady‐state absorption and fluorescence spectra. The fluorescence spectra of these adducts were similar to each other and dependent on the excitation wavelength and solvent.