H3PO4—BF3／ZrO2及H3PO4—BF3—H2SO4／ZrO2催化剂的酸性及结构研究

本文研究了固体酸烷基化反应催化剂H3PO4－BF3／ZrO2及H3PO4－BF3－H2SO4／ZrO2的酸性及其结构。用指示剂法及正丁胺滴定法测定了催化剂的酸强度及酸量；用吸附吡啶的红外光谱法研究了催化剂的表面酸类型；用FT－IR、XPS、XRD、DTA－TG及TPDE等方法研究了催化剂的结构。结果表明；两种催化剂表面均只有Broensted酸，酸强度为－8．2＜H0≤-5.6。H3PO4-BF3/ZrO2中，活性组分强能是以H2PO4^-：BF3的形态存在，BF3通过与H2O4^-的络合作用是催化剂的活性增强。H3PO4－BF3／ZrO2中，存在H2SO4与ZrO2的成盐作用，同时亦有可能存在H2SO4与H3PO4、BF3之间的相互作用。催化剂在下焙烧失活的主要原因是H2PO4^-失水生成P2O7^4－，使催化剂表面质子酸量大幅度降低所致。     

1,3,3a,5—四苯基—3a,4,5,11—四氢—3H,6H—1,2,4—三唑并（ …

通过２，４－二苯基－２，３－二氢－１Ｈ－１，５－苯并二氮杂Ｚｕｏ与苯甲酰氯苯腙的（２＋３）环加成反应制备了标题化合物，用Ｘ射线单晶衍射仪测定了其晶体结构，晶体属正交晶系，空间群为Ｆｄｄ２．晶胞参数；ａ＝１．７６２８（４）ｎｍ，ｂ＝５．７５１２（１２）ｎｍ，ｃ＝１．０２２７ｎｍ，Ｖ＝１０．３６８（５）ｎｍ＾３，Ｚ＝１６，Ｄｃ＝１．２６２ｇ．ｃｍ＾－３，μ＝０．０７５ｍｍ＾－１，Ｆ（０００）＝４１６０     

Photosynthesis and Molecular Structure of2—Amino—3H—phenoxazin—3—one

1 INTRODUCTION 2-Amino-3H-phenoxazin-3-one (APX) is related to the naturally occurring antineoplastic actinomycin D and has been used as a chemical model of actinomycin D[1]. Usually APX is synthesized from 2-aminophenol with the phenoxazinone synthase in human body[2]. A variety of artificial synthesis methods of APX via the oxidation of 2-aminophenol have also been reported, but each method needs some artificial condition such as chemical catalysis[3～7], natural enzyme[8], UV…     

气相离子—分子反应B3H3^—＋CS2→B2H3S^—＋CS的理论研究

用密度泛函方法B3LYP/6-311 G(d,p)和高级电子相关的偶合簇法CCSD（T）／6－311＋＋G（d,p)研究了气相离子,分子反应B2H2^- CS2→B2H3S－＋CS的机理,结果表明,B2H3－最可能进攻CS2中碳原子形成三元环中间体,随后通过氢迁移和最终消除CS的反应步骤形成硫原子转移产物H3BBS^- CS,反应大量放热且不需要活化能,B2H3^-直接对CS2中硫原子进攻夺取硫原子的反应方式存在一定能垒阻碍,计算结果有助于深入了解B2H3－,B3H6和B4H7－等缺电子硼氢负离子反应行为。     

螺旋共轭化合物1‘,3’,3‘—三甲基—6—羟基螺旋[2H—1—苯 …

用ＡＭ１和ＺＩＮＤＯ方法了螺旋共轭化合物１’,３’,３’－三甲基－６羟基螺旋「２Ｈ－１－苯并吡喃－２,２’－二氢吲哚」及其光导构化产物的结构和光谱性质,从理论上研究了ＨＢＰＳ的光导构化反应过程,并在此基础上,用自编的完全态求和公式程序计算了非线性光学系数。     

Critical temperatures,pressures, and densities for the mixtures CO2–C3H8, CO2–nC4H10, C2H6–C3H8, and C3H8–nC4H10

A simple method is developed to estimate mixture critical temperatures (T_c), pressures (P_c), and densities (ρ_c) as a function of overall composition (X) from near critical region experimental coexistence data. This three-step method is applied to four mixtures, CO₂–C₃H₈, CO₂–nC₄H₁₀, C₂H₆–C₃H₈, and C₃H₈–nC₄H₁₀. Isothermal liquid–vapor coexistence data, which includes temperature, vapor pressure, coexisting densities (ρ^ℓ and ρ^v), and coexisting compositions for the more volatile component (x₁^v and x₁^ℓ) are used. In the first step, the difference of the saturated liquid and vapor densities (ρ^ℓ−ρ^v) is fitted to an empirical function in ((P_c−P)/P_c) to obtain P_c. Then P/P_c and ((ρ^ℓ+ρ^v)/2ρ_c) are simultaneously fitted to functions of a polynomial in (X₁−(x₁^v+x₁^ℓ)/2) yielding estimates of ρ_c and X₁. Finally, the discrete estimated critical data points are fitted with an equation to provide a continuous representation of the critical lines. The method is successfully tested for the mixtures, CO₂–C₃H₈ and CO₂–nC₄H₁₀, for which there is a reasonable amount of isothermal data. The procedure is then applied to the mixtures, C₂H₆–C₃H₈ and C₃H₈–nC₄H₁₀, for which there are sparse data. For all four mixtures, the critical temperature line, T_c vs. X₁, matches literature values within ±0.5%. The critical pressure line, P_c vs. X₁, and critical density line, ρ_c vs. X₁, match literature values, in general, within ±2%.     

UNIFAC方程用于H2O—n—C12H26—D2EHPA—LaCl3—HCl萃取体系

本文实验测定了n-C_(12)H_(26)-D_2EHPA在盐酸介质中萃取La~(3+)的平衡数据和H_2O-n-C_(12)H_(26)D_2EHPA体系的活度系数.用Pitzer方程计算水相中H_2O和H~+、La~(3+)的活度系数,用UNIFAC方程计算有机相各组分的活度系数,提出了萃取剂和金属萃合物的基因划分方法,经数据拟合,获得了能在全浓度范围内适用的萃取反应平衡常数和UNIFAC参数,用这些参数成功计算了n-C_(12)H_(26)-D_2EHPA萃取La~(3+)的平衡浓度.     

气相离子-分子反应B2H3-+CS2——B2H3S-+CS的理论研究

用密度泛函方法B3LYP/6-311++G(d,p)和高级电子相关的偶合簇法CCSD(T)/6-311++G(d,p)研究了气相离子-分子反应B₂H₃^-+CS₂B₂H₃S^-+CS的机理.结果表明,B₂H₃最可能进攻CS₂中碳原子形成三元环中间体,随后通过氢迁移和最终消除CS的反应步骤形成硫原子转移产物H₃BBS^-+CS,反应大量放热且不需要活化能.B₂H₃直接对CS₂中硫原子进攻夺取硫原子的反应方式存在一定能垒阻碍.计算结果有助于深入了解B₂H₃,B₃H-6和B₄H₇^-等缺电子硼氢负离子的反应行为.     

Ab initio study of Eu3+–L (L=H2O,H2S,NH2CH3, S(CH3)2, imidazole) complexes

The ground states and binding energies of Eu³⁺–L (L=H₂O,H₂S,NH₂CH₃,S(CH₃)₂, imidazole) complexes has been determined using ab initio techniques. The binding is mostly electrostatic as expected. The empty f orbital is different for the S compounds, being a π-like orbital, while for the O and N containing ligands it is a σ-like orbital. However, the range in the binding energies for the different f holes is small.     

NaBrO3—CH2（COOH）2—H3PO4—CuL^2＋体系的振荡化学研究

四氮杂大环配合物是生物体内一些金属酶结构单元的模拟物,可作为振荡反应催化剂来加以研究.我们报道的一些四氮杂大环铜(Ⅱ)、镍(Ⅱ)配合物所参与的催化振荡反应体系中采用的底液都是稀H_2SO_4,尚未见以H_3PO_4作底液的报道。然而研究以H_3PO_4作底液的     

抑制型离子色谱快速测定I^—,SCN^—,S2O^2—3

本用抑制型离子色谱，薄壳强碱性阴离子交换树脂为分离柱，柱温为３０±１℃，在常规淋洗液ＮａＨＣＯ３－Ｎａ２ＣＯ３中加入对－硝基苯酚作为有机改进剂，测定了Ｉ＾－、ＳＣＮ＾－、Ｓ２Ｏ＾２－３离子。它们有良好的线性关系，三种离子浓度在５．０～３０．０ｍｇ／Ｌ范围内其相关系数分别为：ｒＩ＾－０．９９９４、ｒｓｃｎ＾－０．９９０６、ｒｓ２ｏ＾２－３０．９９８５，检测限分别为：Ｉ＾－０．１７ｍｇ／Ｌ、ＳＣＮ＾     

三元体系La（NO3）3—Gly—H2O的研究

测定了三元体系Ｌａ（ＮＯ３）３－ＧｌｙＨ２Ｏ在２５℃时的溶度和饱和溶液的折光指数。报道了三元体系中生成的三元配合物：Ｌａ（Ｇｌｙ）２（ＮＯ３）３．２Ｈ２Ｏ和Ｌａ（Ｇｌｙ）４（ＮＯ３）３．Ｈ２Ｏ。用熔点、红外光谱及热分析测定了各配合物的一些物理化学性质。