Hydrothermal Syntheses and Crystal Structures of Two Metal-organic Complexes with 2,3-Pyridinedicarboxylic Acid and 2-Methyl-dipyrido[3,2-f:2',3'-h]quinoxaline Ligands

Two unusual one-dimensional（1-D） compounds,viz.[Co（Medpq）（QUI）·H2O]2n· 2.4nH2O 1 and [Cd（Medpq）（QUI）·H2O]n·nH2O 2,were synthesized by the combination of two different metallic salts and organic ligands,namely 2,3-pyridinedicarboxylic acid（H2QUI） and 2-methyldipyrido[3,2-f：2＇,3＇-h]quinoxaline（Medpq） ligand.The compounds were characterized by elemental analyses,TG,fluorescent emission and single-crystal X-ray diffraction analyses.

6-氟-4-羟基-3-氧代-3,4-二氢喹喔啉-1(2 H)-羧酸叔丁酯的合成、晶体结构及抗肿瘤活性研究

喹喔啉类化合物由于具有显著的生物活性而被广泛应用于医药、化工领域,特别是抗癌药物研发领域。本文通过四步反应法首次合成了6-氟-4-羟基-3-氧代-3,4-二氢喹喔啉-1(2 H)-羧酸叔丁酯,经溶液结晶法获得其单晶体。晶体学分析表明,该化合物属单斜晶系,空间群C2/c,晶胞常数a=1.28663(10)nm,b=2.25249(17)nm,c=1.01564(7)nm,Z=8,ρ_(c)=1.359 g·cm^(-3),R=0.0538,R_(w)=0.1406。在B3LYP/6-311+G(2d,p)模式下使用密度泛函理论(DFT)计算了该化合物的最佳结构,与X射线单晶衍射确定的晶体结构基本一致。抗肿瘤活性研究表明其有良好的抗肿瘤作用。此外,通过DFT计算了分子的静电势和前沿分子轨道。

2-甲基-6-乙酰基萘的合成及分子结构解析

2-甲基-6-乙酰基萘(2,6-MAN)作为高性能聚酯材料(如聚萘二甲酸乙二醇酯PEN)的前驱体,其高选择性合成具有重要意义。以2-甲基萘(2-MN)为原料,乙酰氯(AC)为酰化剂,三氯化铝(AlCl_(3))为催化剂,采用正交试验法考察反应物配比、反应时间、反应温度、酰化液滴加温度对酰化过程的影响。采用重结晶法纯化产物,考察溶剂用量、降温速率对目标产物纯度的影响。质谱、红外、一维核磁及二维核磁结果显示,酰化主产物为含有C~6取代的乙酰基官能团的2,6-MAN。正交试验结果表明,反应物配比对酰化产物收率影响最大,酰化剂及催化剂量的不足会降低收率;反应温度对2,6-MAN纯度影响最大。当n(2-MN)/n(AC)/n(AlCl_(3))为1.00/1.20/1.45,反应温度为25℃、反应时间为4 h,酰化液滴加温度为-5~-2℃时,酰化产物收率达90.93%、2,6-MAN纯度为76.32%。以甲醇水溶液为溶剂提纯酰化产物时发现,溶剂用量较多和慢速程序降温可提高目标产物纯度。当溶剂与酰化产物质量比为5/1,慢速降温时可得到纯度大于98%的产品,满足工业氧化生产要求。

Hydrothermal Syntheses and Crystal Structures of Six Complexes Constructed from 1,3,5-Benzenetricarboxylic Acid and 4'-(4-Pyridyl)-2,2':6',2''-terpyridine Mixed Ligands

Six new transition metal complexes, [Zn（HBTC）（PYTPY）]n·n PYTPY（1）, [Cu（HBTC）（PYTPY）]n·n PYTPY（2）, [Co（HBTC）（PYTPY）]n·n DMF（3）, [Mn（HBTC）（PYTPY）]n·n DMF（4）, [Cd（HBTC）（PYTPY）（H2O）]n·2nH2O（5）, and [Co（HBTC）（PYTPY）（H2O）2]（6）,（H3BTC = 1,3,5-benzenetricarboxylic acid, PYTPY = 4＇-（4-pyridyl）-2,2＇：6＇,2＇＇-terpyridine, DMF = N,N？-dimethylformamide）, have been synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction. Complexes 1~5 all feature one-dimensional chain structures, and complex 6 exhibits a zero-dimensional structure. Complexes 1~5 present three-dimensional（3D） supramolecular frameworks via π-π stacking interactions, whenas 6 has also a 3D supramolecular structure assembled by hydrogen bonding. Meanwhile, complexes 1 ~ 6 exhibit the thermal stabilities and photoluminescent properties.

A New Synthetic Route for Preparation of 2-Chloro-6-fluoro- benzonitrile and 2-Chloro-6-fluorobenzoic Acid

An effective synthetic route for preparation of 2-chloro-6-fluorobenzonitrile, 2-chloro-6-fluorobenzamide and 2-chloro-6-fluorobenzoic acid has been described. It includes diazotization, fluorination, ammoxidation and hydrolysis reactions.

Syntheses, Structures and Photoluminescence of the Cadmium(Ⅱ) and Copper(Ⅱ) Complexes Based on 4'-(4''-Pyridyl)-2,2':6',2''-terpyridine and 1,4-Benzenedicarboxylic Acid Ligands

Two new metal-organic complexes [Cd2（1,4-BDC）（4-pytyp）（H2O）4]·（1,4-BDC）（1） and [Cu2（1,4-BDC）（4-pytyp）2（H2O）2]·（1,4-BDC）·8H2O（2）（4-pytyp = 4＇-（4＇＇-pyridyl）-2,2＇：6＇,2＇＇-terpyridine, 1,4-H2 BDC = 1,4-benzenedicarboxylic acid） have been synthesized under hydrothermal conditions and characterized by elemental analysis, infrared analysis and X-ray single-crystal diffraction. The scrutiny of single-crystal structure reveals that complex 1 forms to a 3D supramolecular network linked by π-π stacking interactions and hydrogen bonds. X-ray diffraction analysis reveals that complex 2 exhibits a 3D supramolecular network linked through complicated hydrogen bonds. The thermogravimetric analysis and photoluminescent properties of 1 and 2 are discussed in detail.

2-甲基-6-丙酰基萘液相氧化制备2,6-萘二甲酸研究

以2-甲基-6-丙酰基萘为原料,在Co-Mn-Br催化体系中液相氧化制备2,6-萘二甲酸,考察了催化剂质量分数、助催化剂比例、反应温度、反应压力、原料与溶剂质量比、反应时间、空气流量等因素对反应的影响。利用HPLC、IR、^(1)HNMR、pH计对产物进行定性分析。得出制备2,6-萘二甲酸的适宜反应条件为:温度为190℃、时间为45 min、m(Co)∶m(Mn)∶m(Br)=1∶2∶5、m(MPN)∶m(HAc)=1∶15、压力为2.0 MPa、空气流量为1.4 L/min。在此条件下,2,6-萘二甲酸收率和纯度分别为83.47%和91.94%,可达到减少重结晶等提纯步骤、简化工艺流程、降低氧化反应原料成本。

柠檬酸辅助溶剂热法制备Bi_(2)MoO_(6)及其光催化性能

高效可见光响应光催化材料的开发对光催化技术的发展有着至关重要的作用。采用柠檬酸(CA)辅助溶剂热法制备Bi_(2)MoO_(6),对其进行XRD、SEM、UV-Vis DRS、BET及PL表征,并研究可见光下降解环丙沙星(CIP)、灭活大肠杆菌(E.coli)和金黄色葡萄球菌(S.aureus)的性能。CA添加量为3 mmol时制备的BM-3展现出最优的光催化活性,在100 min内对CIP的降解率达到89.5%,其反应速率常数为不添加CA制备的BM-0的2.45倍,也能在150 min内将E.coli完全灭活,在200 min内将S.aureus灭活,失活后的细菌细胞由于内容物泄漏而表面凹陷且易聚集。多次循环实验证明BM-3具有良好的稳定性。宽的可见光吸收范围、大的比表面积和高效的光生载流子分离效率有利于CA辅助溶剂热法制备的Bi_(2)MoO_(6)光催化性能增强。

MoS2/Zn3In2S6 composite photocatalysts for enhancement of visible light-driven hydrogen production from formic acid

Enhancing the separation efficiency of photogenerated carriers is propitious for the promotion of photocatalytic hydrogen production from formic acid decomposition.Herein,MoS2/Zn3In2S6(MoS2/ZIS6)composite photocatalysts containing varying mass percentages of MoS2 were obtained by a straightforward synthetic method.The results confirmed that MoS2,as a cocatalyst,markedly promoted the photogenerated charge separation efficiency and visible light-driven hydrogen production activity of ZIS6(λ>400 nm).Specifically,the as-prepared 0.5%MoS2/ZIS6 photocatalyst exhibited the highest photocatalytic hydrogen production rate(74.25μmol·h^-1),which was approximately 4.3 times higher than that of ZIS6(17.47μmol·h^-1).The excellent performance of the 0.5%MoS2/ZIS6 photocatalyst may be due to the fact that MoS2 has a low Fermi energy level and can thus enrich photogenerated electrons from ZIS6,and furthermore reduce H+derived from formic acid,to form hydrogen.The structure and morphology of the MoS2/ZIS6 photocatalysts and the reactive species were determined by X-ray diffraction,transmission electron microscopy,and field emission scanning electron microscopy,among others;a plausible mechanistic rationale is discussed based on the results.

A 3D-QSAR Study on C-3 Substituted 4,6-Dichloroindole-2- Carboxylic Acids with Comparative Molecular Field Analysis

Aim and Method Comparative molecular field analysis (CoMFA), a threedimensional quantitative structure-activity relationship (3D-QSAR) method was applied to a novelseries of C-3 substituted 4, 6-dichloioindole-2-carboxylic acids to study the relationship betweentheir structure and the affinity for the glycine site of the NMDA receptor. Result Hie coefficientsof cross-validation q^2 and non cross-validation r^2 for the model established by the study are0.744 and 0.993, respectively, the value of variance ratio F is 261.343, and standard error estimate(SE) is 0.039. Conclusion These values indicate that the CoMFA model may have a good prediction forthe activity of C-3 substituted 4, 6-dichloroin-dole-2-carboxylic acids. As a consequence, thepredicted activity values of new designed compounds supports our conclusion from the model.

CRYSTAL STRUCTURE OF BINUCLEAR Y(Ⅲ) COMPLEX WITH p-METHYLBENZOIC ACID, Y_2(p-CH_3C_6H_4COO)_6(C_(12)H_8N_2)_2

Y_2(p-CH_3C_6H_4COO)_6(C_(12)H_8N_2)_2, Mr=1349.08, triclinic, space group P, a=13.00(3), b=19.743(2), c=12.754(3)A, α=97.94(1), β=106.24(2), γ=91.66(1)°, V=3177(1)~3, Z=2, Dc=1.41gcm^(-3), λ(MoKα)=0.71069, μ=18.92 cm^(-1), F(ooo)=1384, T=295K, final R=0.073 for 6504 observed reflections with Ⅰ>36(Ⅰ). There are two nonidentical binuclear molecules with different bridging connection patterns in a cell. One has four bridging carboxyl groups bound two Y(Ⅲ) ions and another only has two. The Y-Y distance is 4.196 for the former and 5.302 for the latter respectively.

A One-dimensional Cd(Ⅱ)Coordination Polymer Constructed from 1,4-Benzene-dicarboxylic Acid and 3-(2,6-Di(pyrazin-2-yl)pyridin-4-yl)-1H-indole:Synthesis,Structure and Photoluminescence

A new coordination polymer {[Cd（C_（21）H_（14）N_6）（C_8H_4O_4）]·H_2O}_n（1） was synthesized by an elaborate design via the reaction of 3-（2,6-di（pyrazin-2-yl）pyridin-4-yl）-1H-indole（bppi）,1,4-benzene-dicarboxylic acid（H2bdc） and cadmium（Ⅱ） nitrate in CH_3OH/H_2O mixed solvents. Complex 1 crystallizes in orthorhombic,space group Ccca with a = 20.012（4）,b = 31.881（6）,c = 19.808（4） ？,V = 12638（4） ？~3,Z = 16,C_（29）H_（20）CdN_6O_5,M_r = 644.91,D_c = 1.356 g·cm^（-3）,μ = 0.735 mm^（-1）,F（000） = 5184,GOOF = 1.046,the final R = 0.0405 and wR = 0.1063 for 6870 observed reflections（I 〉 2σ（I））. The Cd（Ⅱ） centre is hepta-coordinated by three N and four O atoms from one bppi terminal ligand and two bdc2– ligands,respectively,displaying a capped trigonal prism geometry. Structure extension gives coordination polymeric chains,in which the bdc2– linkers connect Cd（Ⅱ） cations into a one-dimensional（1D） coordination polymer along the c axis,giving zigzag chains with the Cd···Cd separation of 11.178（1） ？. The adjacent bppi terminal ligands in the chains are anti-periplanar conformation. The three-dimensional（3D） structure is stabilized by π···π stacking and hydrogen-bonding interactions to form a supramolecular self-penetrating network with 1D channels. In 1,there are voids 2999.7 ？~3 with 23.7% of per unit cell volume. Thermal analysis indicates that the framework of 1 is stable until 651 K and the photoluminescence of 1 in the solid shows very weak fluorescence at 382 and 560 nm upon excitation at 310 nm.

N,N-二甲基-6-酰胺-吡啶-2-羧酸与铀酰离子的配位化学研究

N,N-二甲基-6-酰胺-吡啶-2-羧酸(DMAPA,HL)是一种多齿吡啶羧酸类配体,可通过酰胺的羰基氧原子、吡啶环氮原子、羧基氧原子与金属离子配位。本工作通过水溶液体系的荧光光谱滴定、电位滴定、拉曼光谱滴定和配合物晶体结构测定等方法研究了DMAPA与UO2+2的配位化学。研究发现,在水溶液中,DMAPA除了以脱质子的形式(L^(-))与UO_(2)^(2+)形成UO_(2)^(L+)和UO_(2)^(L2)两种配合物外,也可以不脱质子的DMAPA中性分子形式(HL)与UO_(2)^(2+)形成UO_(2)(HL)^(2+)配合物。在此基础上,引入HEDTA为竞争配体,通过电位滴定法重新测定了UO_(2)^(L+)和UO_(2)L_(2)两种配合物的稳定常数,分别为10^(5.45±0.06)和10^(7.67±0.10);并通过荧光光谱滴定测定了新确认的UO_(2)(HL)^(2+)配合物的稳定常数,为10 ^(6.32±0.09)。通过比较晶体配合物UO_(2)L_(2)的拉曼光谱与水溶液体系中UO_(2)L^(+)和UO_(2)(HL)^(2+)的拉曼光谱,确定水溶液中两种配合物中L^(-)和HL的配位模式相同,二者均以三齿配体的形式与UO_(2)^(2+)配位。

2,6-二氟苯甲腈的合成及其水解工艺研究

以2,6-二氯苯甲腈为原料,环丁砜为溶剂,采用分段升温法,与高活性无水氟化钾反应,制得2,6-二氟苯甲腈,收率87.6%。2,6-二氟苯甲腈通过控制不同的水解条件,制得2,6-二氟苯甲酰胺(收率89%)和2,6-二氟苯甲酸(收率90.5%)。

Synthesis and DNA Cleavage Studies of 2,6-Dimethoxyhydroquinone-3-Mercaptoacetic Acid Conjugates

In an effort to investigate the use of short peptide chains as carriers of new anti-tumor agents, we synthesized four tripeptide-cytotoxic agent conjugates: DMQ-MA-Lys(DMQ-MA)-Phe -Arg-Ome, DMQ-MA-Lys(DMQ-MA)-Ile-Arg-Ome, DMQ-MA-Lys(DMQ-MA)-Val-Arg-Ome, DMQ-MA-Lys(DMQ-MA)-Lys(Cbz)-Arg-Ome. The cytotoxic agent conjugated to the N-terminal and the xi -amino group of Lysine of the tripeptide is 2,6-dimethoxyhydroquinone-3-mercaptoacetic acid (DMQ-MA). The tripeptides were synthesized by coupling protected amino acid residues according to Pfp/DCC methods (Pfp: pentafluorophenol, DCC:N,N'-dicyclohexyl-carbodiimide) in solution. Agarose gel electrophoresis showed that these compounds can cleave supercoiled DNA into open-circular form in drug concentration as low as 4-50 mu M without H2O2 and UV irradiation. Further studies on their cytotoxicity for these conjugates are ongoing.

高温液态水中2,6-二氟苯腈水解反应动力学

为了开发2,6-二氟苯甲酰胺的绿色制备工艺以及探讨高温液态水中腈类物质的水解规律,研究了高温液态水中2,6-二氟苯腈无催化水解反应动力学。系统地研究了不同初始浓度、不同温度下2,6-二氟苯腈、2,6-二氟苯甲酰胺的水解反应动力学以及2,6-二氟苯甲酸的脱羧反应动力学。采用一级串联反应动力学方程拟合2,6-二氟苯腈的水解反应动力学数据,得到2,6-二氟苯腈和2,6-二氟苯甲酰胺水解反应的表观活化能分别为96.7kJ.mol-1和75.4 kJ.mol-1,2,6-二氟苯甲酸脱羧反应的表观活化能为184.3 kJ.mol-1。所得结果不仅证明了从2,6-二氟苯腈出发无催化水解制备2,6-二氟苯甲酰胺的可行性,同时为腈类化合物在高温液态水中的水解规律提供了重要的基础数据。

Synthesis of (2S,4S)-2-Substituted-3- (3-Sulfanylpropanoyl)-6- Oxohexahydropyrimidine-4-Carboxylic Acids as Potential Antihypertensive Drugs

Proceeding from natural amino acid L-asparagine and commercially available aldehydes a stereoselective synthesis was developed of (2S,4S)-2-alkyl(aryl)-3-(3-sulfanylpropanoyl)-6-oxohexahy- dropyrimidine-4-carboxylic acids, potential antihypertensive drugs, inhibitors of the angiotensin converting enzyme.

2-羟基-6-萘甲酸及其杂质含量的液相色谱测定

用甲醇-乙腈和0.02 mol/L KH2PO4溶液为流动相进行梯度洗脱,在AKsail ODS色谱柱建立了分离检测2-羟基-6-萘甲酸及其杂质的分析方法。结果表明,2-羟基-6-萘甲酸、2-萘磺酸、1,4-萘二甲酸、2-羟基-6-萘甲酸甲酯、2-羟基-3-萘甲酸的RSD分别为0.000 4%、0.14%、0.23%、0.08%、0.11%,回收率为86.70%～100.5%,定量限、线性关系、精密度和加标回收率均能满足定量分析要求。

水热法制备Bi_(2)WO_(6)及其光催化降解氯贝酸

通过一步水热法制备具有可见光响应的Bi_(2)WO_(6)光催化材料,采用扫描电镜(SEM)、透射电镜(TEM)、X射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料进行表征分析,通过电子顺磁共振谱(ESR)技术对反应活性物质进行表征。以氯贝酸为目标污染物进行光催化性能测试,探究了污染物浓度、催化剂投加量、光电流强度、溶液pH、阴离子和腐殖酸6种因素对光催化性能的影响。实验表明:Bi_(2)WO_(6)材料在可见光下对氯贝酸具有良好的催化效果,并且在污染物浓度为10 mg/L,催化剂投加量为60 mg(0.6 g/L),光电流强度为20 A,在初始溶液pH为5.0和不投加腐植酸的条件下,取得最佳的氯贝酸降解效果。h+和·OH是反应的主要活性氧化物质,材料经历5次循环后光降解率仅下降不到2%。

基于Hg_(2)[Fe(CN)_(6)]纳米酶的多功能酶级联传感体系检测葡萄糖和酸性磷酸酶

该文基于Hg^(2+)可与K_( 4)[Fe(CN)_(6)]原位反应形成Hg_(2)[Fe(CN)_(6)]纳米酶的机理,并利用过氧化氢(H_(2)O_(2))可激发Hg_(2)[Fe(CN)_(6)]酶活性,以及焦磷酸盐(PPi)可通过与Hg^(2+)结合阻止Hg_(2)[Fe(CN)_(6)]纳米酶的形成的原理,构建了多功能酶级联传感平台。当葡萄糖存在时,葡萄糖氧化酶氧化葡萄糖生成H_(2)O_(2),Hg_(2)[Fe(CN)_(6)]催化H_(2)O_(2)分解产生的羟基自由基(·OH)可氧化底物3,3',5,5'-四甲基联苯胺(TMB)显色,从而实现葡萄糖的检测。该方法对葡萄糖检测的线性范围为0.10~500μmol/L,检出限为30 nmol/L。当酸性磷酸酶(ACP)存在时,ACP可以水解PPi并释放出与PPi结合的Hg^(2+),Hg^(2+)与K_( 4)[Fe(CN)_(6)]原位反应生成Hg_(2)[Fe(CN)_(6)]纳米酶,进而可实现ACP的检测。结果表明,该方法对ACP检测的线性范围为0.03~50 U/L,检出限为0.0070 U/L。该传感平台操作简单、灵敏度高,为多功能传感体系的设计提供了一种新的思路。