CHARACTERIZATION AND CATALYTIC PERFORMANCE OF PLATINUM SUPPORTED ON Sn-MgAl_2O_4

IntroductionSupportedPt-Sncatalystsareimpo~inthepdrileumandpthechendcalindustricsbecauseoftheirsuperiorcatalyticperformances.Forexample,Pt-Snsupportedonaneutralsupporthasbeenreportedtoexhibithighdehydrogenationselectivityanddebilitythansupportedplatinumca…     

碳酸根离子柱撑钴铝水滑石的合成与表征

水滑石类化合物近年来受到人们的广泛关注,它具有的独特的阴离子柱撑层状结构及独特的阴离子可交换性和阳离子可搭配性,使它成为一种多功能的新型催化材料［１］．本文报道的是钴铝水滑石类化合物（ＣｏＡｌＨＴ）的制备规律及其表征．１实验部分１．１ＣｏＡｌ?..     

INVESTIGATION OF THE ANTIVIRAL ACTION OF THE PHOTOACTIVE COMPOUND PHENYLHEPTATRIYNE

Abstract— Murine cytomegalovirus, a herpes virus, was used as a model virus to investigate the mechanism of the anti-viral action of phenylheptatriyne in long wave ultraviolet light. The genome and proteins of the inactivated virus penetrated the nuclei of susceptible cells normally. Furthermore, the viral genome did not contain extra single strand breaks or cross-links. However, cells infected with the treated virus did not synthesize late viral proteins, as determined by polyacrylamide gel electrophoresis. nor did they synthesize late viral RNA and viral DNA according to nucleic acid hybridization tests. Thus the compound may interfere with an early viral function so that the replication cycle cannot proceed.     

THE PREPARATION AND SURFACE CHARACTERIZATION OF AN IDEAL MODEL COLLOID

ABSTRACT

Monodisperse polystyrene latexes were prepared with and without emulsifier using persulfate initiator. The latexes were ion-exchanged with purified Dowex 50W(H⁺)-Dowex 1(0H^?) mixed resin to remove solute electrolyte and adsorbed emulsifier and to convert acidic surface groups to the H⁺ form. Conductometric titration showed that all latexes contained only strong-acid surface groups, presumably the sulfate endgroups of the polymer chains introduced by the persulfate initiator. The sulfate-stabilized latexes (H⁺ form) were hydrolyzed to the hydroxyl form after 2–8 weeks at room temperature or 48–120 hours at 363°K. The rate of the acid-catalyzed hydrolysis is enhanced by increasing the glass contact surface area, by adding Pyrex glass beads. Conductometric titration of the hydrolyzed latexes after ion exchange showed no titratable groups, indicating that the latexes were stabilized by hydroxyl groups. The latexes were oxidized to the carboxyl form by heating the hydroxyl-stabilized latex with persulfate and traces of heavy metal ions or the sulfate-stabilized latex in contact with Pyrex glass beads. For example, latex 520′ prepared without emulsifier using persulfate initiator and bicarbonate buffer contained only strong-acid surface groups after cleaning, no titratable groups after hydrolysis, and only carboxyl groups in the same number as the original sulfate groups after oxidation. Thus the three forms of the latex provide ideal model colloids, rigid monodisperse spheres stabilized with the same number of chemically bound surface groups of three types —strong-acid sulfate, weak- acid carboxyl, and uncharged hydroxyl.     

顺式-1,3环己二胺合铂配合物的合成、表征及抗癌作用

合成了[Pt(1,3-DACH)X₂](其中1,3-DACH为1,3-环己二胺,X=Cl^-、Br^-、(1/2)O_x^2-、(1/2)mal^2-、AC-CL^-、(1/2)SO₄^2-、NO₃^-)等七种二价铂配合物,并进行了表征,测定了配合物抑制小鼠L-1210白血病及S-180的活性,发现[Pt(1,3-DACH)(AC-Cl)₂〕在此系列中抗癌活性最高,并讨论了配合物的结构与功能的关系。     

SYNTHESIS AND CHARACTERIZATION OF A SILICA-SUPPORTED CARBOXYMETHYLCELLULOSE PLATINUM COMPLEX AND ITS CATALYTIC BEHAVIORS FOR HYDROGENATI0N OF AR0MATICS

A silica-supported carboxymethylcellulose platinum complex (abbreviated as SiO_2-CMC-Pt) has been prepared and characterized by XPS. Its catalytic properties for hydro-genation of aromatic compounds were studied. The results showed that this catalystcould catalyze the hydrogenation of phenol, anisol, p-cresol, benzene and toluene to cyclo-hexanol, cyclohexyl methyl ether, p-methyl cyclohexanol, cyclohexane and methylcyclo-hexane, respectively in 100% yield at 30℃ and 1 atm. In the hydrogenation of phenol,COO/Pt ratio in SiO_2-CMC-Pt has much influence on the initial hydrogenation rate andthe selectivity for the intermediate product, cyclohexanone. The highest initial rate andthe highest yield of cyclohexanone both occur at COO/Pt ratio of 6. The complex is stableduring the reaction and can be used repeatedly.     

STRUCTURE AND CONFORMATION OF PHOTOSYNTHETIC PIGMENTS AND RELATED COMPOUNDS 7. ON THE CONFORMATION OF THE METHYL ESTER OF (20-METHYLPHYTOCHLORINATO)NICKEL(II)-A BAaERIOCHLOROPHYLL c MODEL COMPOUND

Abstract The crystal and molecular structure of the title compound 4 have been determined by single crystal X-ray crystallography. The structure shows the typical S,-ruffled conformation observed for Ni(II) tetrapyrroles. Compared to the structure of the methyl ester of (13²-demethoxycarbonyl-pheophorbidato a)nickel(II), 4 shows a smaller C_a-C_m-C_m angle and a higher degree of conformational distortion at the methyl-substituted C20 position. This local distortion of the macrocycle might account for the bathochromic shifted absorption spectra of the bacteriochlorophylls c compared to the d-series. Crystal data: C₃₅H₃₈N₄NiO₃; tetragonal, P4₃2₁2, a = 15.335(7) Å, c = 25.11(2) Å, V = 5904, Z = 8, λ(Mo Kα) = 0.71069 Å, μ= 0.701 mm⁻¹, P(000) = 2624, 130 K, R = 0.058 for 5700 reflections with F > 4.0σ(F).     

固定化木瓜蛋白酶的制备和性质研究

多孔硅球固定化木瓜蛋白酶具有热增活性 .本文在前文研究的基础上 ,用载体交联法制备了甲壳胺固定化木瓜蛋白酶和纤维素固定化木瓜蛋白酶 .考察了固定化pH值、戊二醛浓度和给酶量对固定化木瓜蛋白酶活力的影响 .研究了固定化木瓜蛋白酶的性质 ,特别是热稳定性和耐热性 ,并与溶液酶和多孔硅球固定化木瓜蛋白酶进行了比较 .所制得的甲壳胺固定化木瓜蛋白酶和纤维素固定化木瓜蛋白酶的最适反应温度均达到了 80℃ ;90℃温育 1h后固定化酶的活力保持在 95 %以上 ;70℃温育处理 5h和 6h后固定化酶的活力也仍能保持在 90 %以上 .固定化木瓜蛋白酶的热稳定性和耐热性得到了显著提高     

尖晶石型铁酸盐的制备及表征研究

本文采用空气氧化的湿法制备了尖晶石型铁酸盐，得到最佳生成条件为：在空气流速为２００ｍｌ／ｍｉｎ和配料比Ｒ＝２ＯＨ－／（Ｍ２＋＋Ｆｅ２＋）≥１．０，Ｍ２＋／Ｆｅ２＋＝０．５（摩尔比）下氧化温度和时间分别为３４３－３５８Ｋ和１０－２５ｈ。使用ＸＲＤ、ＴＰＲ和ＴＰＤ等方法对所制备的铁酸盐进行了表征，研究了其结构特征及氧化－还原活性，并讨论了该活性与化学组成及结构的关系。     

尖晶石型铁酸盐的制备和表征研究

本文采用空气氧化湿法制备尖晶石铁酸盐，得到最佳生成条件为：Ｒ－２ＯＨ＾－／（Ｍ＾２＋＋Ｆ２＋）≥１．０；Ｍ＾２＋／Ｆｅ＾２＋＝０．５摩尔比；氧化温度３４３－３５８Ｋ；氧化时间１０－２５小时。通过ＸＲＤ、ＴＰＲ和ＴＰＤ等方法对其进行表征，讨论了尖晶石型铁酸盐的氧化－还原活及其化学组成和结构的变化。     

异羟肟酸类氧载体新模型化合物研究

异羟肟酸类氧载体新模型化合物研究阳华秦圣英＊吕志凤周先礼李建章卢晓霞（四川大学化学系，成都６１００６４）关键词异羟肟酸钴（Ⅱ）配合物氧载体氧合反应催化环氧化中图分类号Ｏ６１３．６１仿生氧载体研究，已成为当今生物有机和生物无机化学家最关注的课题之一。在...     

钠、钙、铁对模型化合物热解及燃烧过程中氮逸出规律的影响

将卟唑在650℃，12MPa焦化条件下所得产物作为含氮模型化合物，在固定床反应器中研究了该模型化合物热解及燃烧过程中氮的逸出行为。结果表明，热解温度低于900℃时燃料氮主要停留在半焦中，HCN和NH3只占很小的部分；催化热解使HCN的量相对减少，NH3相对增加；半焦的反应性和燃烧条件影响半焦氮氧化生成NO，半焦的反应性越高，半焦氮对于NO的转化率越低；低温下催化剂使半焦氮对于NO的转化率升高，而高温下则相反。催化剂对于半焦燃烧时NO排放的影响还与半焦的性质有关，同一催化剂在相同的燃烧条件下对不同半焦燃烧的NO释放有不同的影响，预示半焦的性质和催化剂之间也有一定的匹配性。     

SYNTHESIS AND CHARACTERIZATION OF DVE-CO-MA DERIVATIVES OF CIS- PLATINUM COMPLEXES

Copolymer of divinyl ether and maleic anhydride (DVE-co-MA) derivatives of cis-platinum complexes were synthesized and characterized by elementary analysis, IR and XPS ( X-ray photoelectron spectroscopy). The behavior of the products in biological environment was also studied. UV-visible and fluorescence spectra show that these polymer derivatives are able to exchange ligands with selected nucleophilic groups in biological environment.     

含氧单体和1－烯烃配位共聚合研究及共聚物表征

考察了极性含氧单体，４－戊烯氧基三甲基硅烷（ＰＴＭＳ）在络合Ⅱ型ＴｉＣｌ３－Ａｌ（ｉ－Ｃ４Ｈ９）３催化体系下与丙烯共聚合情况．通过脱三甲基硅保护基，合成了丙烯，戊烯醇共聚物，并用ＩＲ，ＮＭＲ等方法进行表征．详细考察了Ａｌ／Ｔｉ比，温度等聚合条件对共聚合的影响．初步研究了共聚合的动力学行为．此外，还发现丙烯，戊烯醇共聚物保持了较好的物理性质，如较高的熔点，等规度，抗降解能力，粘接性等，为聚烯烃功能化提供了一条新的途径．     

含氧单体和1－烯烃配位共聚合研究及共聚物表征

考察了极性含氧单体，４－戊烯氧基三甲基硅烷（ＰＴＭＳ）的络合Ⅱ型ＴｉＣｌ３Ａｌ（ｉ－Ｃ４Ｈ９）３催化体系下与丙烯共聚合情况，通过脱三甲基硅保护基，合成了丙烯，戊烯醇共聚物，并用ＩＲ，ＮＭＲ等方法进行表征，详细考察了Ａｌ／Ｔｉ比，温度等聚合条件对共聚合的影响。初步研究了共聚合的动力学行为，此外，还发现丙烯，戊烯醇共聚物保护了较好的物理性质，如较高的熔点，等规度，抗降解能力，粘接性等，为聚烯烃功能化提     

希土离子单硫代二苯甲酰甲烷配合物的合成及性质研究

本文合成了单硫代二苯甲酰甲烷(HTDBM)和三价希土离子及路易斯碱(Q)的Ln(TDBM)₄QH型配合物(Ln=除Ce外的La～Lu,Q=二乙基胺).测定了它们的摩尔电导值、红外光谱,可见—紫外光谱,核磁共振谱.观察到配合物是通过硫原子、氧原子同时与Ln³⁺离子配位.Ln-O键强于Ln-S键.在Nd³⁺、Pr³⁺、Ho³⁺、Er³⁺离子的该类配合物的可见吸收光谱中发现超灵敏跃迁现象.讨论了题述配合物作为核磁共振化学位移试剂的可能性.     

希土离子单硫代二苯甲酰甲烷配合物的合成及性质研究

本文合成了单硫代二苯甲酰甲烷(HTDBM)和三价希土离子及路易斯碱(Q)的Ln(TDBM)_4QH型配合物(Ln=除Ce外的La～Lu,Q=二乙基胺)。测定了它们的摩尔电导值、红外光谱,可见—紫外光谱,核磁共振谱.观察到配合物是通过硫原子、氧原子同时与Ln~(3+)离子配位.Ln-O键强于Ln-S键。在Nd~(3+)、Pr~(3+)、Ho~(3+)、Er~(3+)离子的该类配合物的可见吸收光谱中发现超灵敏跃迁现象。讨论了题述配合物作为核磁共振化学位移试剂的可能性.     

TOLUIDINE BLUE: THE MODE OF PHOTODYNAMIC ACTION IN YEAST CELLS

Abstract— Toluidine blue, a thiazine dye, was shown to have in vivo photodynamic activity through singlet oxygen (O₂¹Δ _g ) production. This was based mainly on the effective protection by N^-₃ and the marked enhancement in D₂O for the sensitized inactivation of yeast cells. The mode of the in vivo activity was, however, quite different from that of acridine orange, for which the singlet oxygen mechanism has also been proposed. The most characteristic feature in the toluidine blue-sensitization was the total lack of the induction of gene conversion (at trp 5), while the survival went down below 10%. The non-induction of genetic changes was confirmed at several pH's in the neutral region, whereas the inactivation was seen in parallel to the reported pH dependence of singlet oxygen production in vitro . Direct measurements by microspectrophotometry showed none of the toluidine blue was accumulated in the cell. It was also ascertained from acridine-sensitized induction of gene conversion that toluidine blue never interfered with the binding of acridine orange to cellular DNA. These findings suggested that the unique mode of photodynamic activity of toluidine blue is attributable to its action from outside of the cell. Furthermore, comparisons between the photodynamically treated cells (with toluidine blue) and non-treated cells with respect to the response to UV irradiation excluded certain cell functions relating to the expression of gene conversion from the possible damage sites. The photo-reactivation process of UV induced gene conversion was not disturbed by the pre-toluidine blue sensitition. In view of the foregoing results, the plasma membrane was tentatively suggested as the most likely site of damage.     

A REINVESTIGATION OF THE ACTION OF NITRIC OXIDE ON DIMETHYLZINC AND DIMETHYLCADMIUM

Abstract

The reactions of the dimethylmetals, Me₂ M (M = Zn, Cd), with nitric oxide have been reinvestigated. Two moles of NO are taken up per mole of dimethylmetal in each case. Infrared, laser Raman and mass spectral data indicate that the Me₂M. 2NO adducts are best formulated as MeM[O.N(NO)Me] rather than Me₂M.M[O.N(NO)Me]₂ as had been suggested earlier. On hydrolysis, the methyl(N-methyl-N-nitrosohydroxylamine)metal(II) complexes apparently disproportionate to yield M[O.N(NO)Me]₂ and M(OH)₂.