Ordered porous films based on fluorinated polyimide derived from 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride and 3,3′-dimethyl-4,4′-diaminodiphenylmethane

One of fluorinated polyimides was synthesized from 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 3,3′-dimethyl-4,4′-diaminodiphenylmethane (DMMDA) by two-steps method, which had good solubility and hydrophilicity. 6FDA-DMMDA polyimide was dissolved in chloroform (CHCl₃) and cast on a glass substrate in a humid atmosphere. It was found that 6FDA-DMMDA/CHCl₃ solution was easy to form ordered porous structure at high concentration, and the reason was discussed in detail. In addition, the influences of solution concentration, the atmosphere humidity, were also tested.     

硫化物的生物氧化成手性亚砜

描述了硫化物不对称生物氧化成手性亚砜, 主要为氯过氧化物酶、环己酮单氧酶催化有机硫化物氧化成具有光学活性的亚砜的两条酶促反应途径.     

酞菁,酞菁铁及酞菁镍电子性质的理论研究

以双片层分子为晶体单胞模型，用量子化学具有晶体轨道的ＥＨＭＯ方法研究了酞菁、酞菁铁及酞菁镍的导电性能，讨论了碘掺杂对它的影响。计算结果表明：由于碘掺杂后，系体构型发生了较大的变化，层间作用加强，从而前述几种晶体的能隙均显著降低，电导率大幅度提高。     

Nitration Reaction Catalyzed by Horseradish Peroxidase in the Presence of H2O2 and NaNO2

The enzymatic nitration of phenol and m-cresol catalyzed by horseradish peroxidase was studied in the presence of H2O2 and NaNO2. The results showed that the nitration products of phenol were 2-nitro and 4-nitrophenols. There was also a small amount of by-products of hydroquinone and catechol. The influences of various reaction parameters, including pH, organic solvent type, and concentrations of NaNO2 and H2O2, on the nitration products were investigated. The yields of 4-nitrophenol and 2-nitrophenol were 14% and 12%, respectively. The nitration products of m-cresol were 4-nitro-m-cresol and 6-nitro-m-cresol, and the yields of 4-nitro-m-cresol and 6-nitro-m-cresol were 19% and 30%, respectively.     

THE EFEFCT OF MAGNETIC FIELD ON POLYMERIZATION OF STYRENE IN THE PRESENCE OF POLYVINYL NAPHTHALENE AND POLYVINYL BENZOPHENONE

In the process of bulk photopolymerization of styrene initiated by AIBN decomposition polyvinyl benzophenone (PVB) can supply an effective cage for triplet-triplet energy transfer between PVB macromolecules and small molecules of AIBN to influence the molecular weight of polystyrene in weak magnetic field (less than 0.035T), that was different from the case of polyvinyl naphthalene (PVN) which supplied cages for this system only in the stronger magnetic field (more than 0.2 T) studies. It was found that in the same conditions, PVN could exert more tremendous influences on the bulk photopolymerizatiou system of styrene than PVB because in the stronger magnetic field the triplet PVN had much longer life time than PVB.     

Chemoenzymatic Synthesis of Cellular Adhesion Tripeptide RGD Precursor in Organic Media

IntroductionA characteristic tripeptide sequence Arg-Gly-Asp(RGD) that is found within fibronectin and other rela-ted adhesion molecules in extracellular matrices(ECM)has received considerable attention from researcherssince it was proved to be a recognit…     

层状锑磷酸嵌接式卟啉锰制备与模拟细胞色素氧化催化研究

层状锑磷酸嵌接式卟啉锰制备与模拟细胞色素氧化催化研究胡希明，皮宗新，梅治乾，古国榜，黄仲涛（华南理工大学应用化学系，华南理工大学化学工程系，广州，５１０６４１）关键词卟啉锰，层状锑磷酸，嵌接，催化性能细胞色素Ｐ４５０是一种含血红素的单充氧化酶，在室温...     

一种新颖有机-无机杂化配位聚合物[(C10H16N)2（Pb2I6）·2DMF·H2O]n的自组装合成和晶体结构(英)

A novel coordination polymer [(C₁₀H₁₆N)₂（Pb₂I₆）·2DMF·H₂O]_n (C₁₀H₁₆N=N-butyl-2-Methy-Pyridinium) was synthesized by the reaction of Pb(NO₃)₂ with C₆H₁₀NI at room temperature in DMF solvent and structurally characterized by means of X-ray single diffraction. The title compound crystallizes in triclinic system, space group P1 with a=1.1237(2) nm, b=1.25330(16) nm, c=0.808 00(12) nm, α=102.523(4)°, β=92.475(5)°, γ=95.712(10)°, V=1.102 9(3) nm³, Z=1, D_c=2.470 Mg·m^-3, F(000)=738, chemical formula C₂₆H₄₈N₄O₃Pb₂I₆ and M_r=1 640.46, μ（MoKα）=11.849 mm^-1, the final R=0.057 8 and wR=0.166 5 for 3716 observed reflections with I > 2σ(I). The title compound consists of cations ([(C₁₀H₁₆N)⁺] and anion chain(PbI₃^-),they are combined by static attracting forces in the crystal. DMF and H₂O locate between the organic and inorganic moiety. CCDC: 210812.     

反应原料组成对单分散苯乙烯微球粒径及其分布的影响

采用分散聚合工艺制备微米级单分散聚苯乙烯微球，并对分散聚合反应的内部影响因素(分散稳定剂、助稳定剂、单体、引发剂)进行了研究．结果表明，随着分散稳定剂和助稳定剂用量的增加，聚苯乙烯微球的粒径减小；随着单体和引发剂用量的增加，聚苯乙烯微球的粒径增大．分散稳定剂和单体用量是影响聚苯乙烯微球粒径分布的两个主要内部因素．     

手性5-l-(艹孟)氧基丁内酯并[3,4-d]-3-取代基-异(口恶)唑啉类化合物的合成

研究了手性元5-(R)-(l-(艹孟)氧基)-2(5H)-呋喃酮与取代苯甲醛肟以次氯酸钙作为氧化剂进行的区域选择性原位1,3-偶极环加成反应,同步生成两个新的手性中心,得到了一系列光学纯丁内酯并[3,4-d]-3-取代基-异(口恶)唑啉类化合物;应用波谱学手段及X射线单晶衍射法确证了产物的绝对构型,并对产物的核磁共振氢谱规律性加以总结.