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A Review on 4, 5-Imidazoledicarboxylic Acid: Their Chemistry and Coordination Potentials 4,5 -咪唑二羧酸的化学性质及配位势研究进展
Pub Date : 2017-06-23 DOI: 10.4172/2329-6798.1000222
W. B. Dirersa
As part of heterocyclic imidazole interest to explore new receptors for anion; 4,5-imidazoledicarboxylic acid and their derivatives have great roles in coordination chemistry. This review, was also update the application and behaviour of 4,5-imidazoledicarboxylic acid (H3IMDC) as a potential motif for coordination compound in supramolecular structure activity. H3IMDC contains one imidazole NH and two COOH protons which could be donated for hydrogen bonding to the anions. Due to the electronic properties of carboxyl group oxygens, coordination to metal ions can occur in different modes. In situ ligand synthesis is of growing interest as a new approach for the synthesis of coordination polymers. The main reason for interesting of 4,5-imidazoledicarboxylic acid (H3IMDC) and its derivatives in coordination polymers of metal-organic framework is because it has six potential donor atoms: two imidazole nitrogens and four carboxylate oxygen atoms, and can remove one to three hydrogen atoms forming H3-nIMDCn- (n=1,2 or 3) species. The six donors may show various coordination modes and construct beautiful structures. In present review, the chemistry of 4,5-imidazoledicarboxylic acid and its coordination potential in coordination and supramolecular chemistry, which are uses as input for medicinal and drug synthesis, pharmacological actions and as biological activity; where reviewed based on the coordination potentials of imidazole derived heterocyclic molecules in metal-organic frameworks.
作为杂环咪唑的一部分,探索新的阴离子受体的兴趣;4,5-咪唑二羧酸及其衍生物在配位化学中具有重要的作用。综述了4,5-咪唑二羧酸(H3IMDC)作为配位化合物潜在基序在超分子结构活性方面的应用和行为。H3IMDC含有一个咪唑NH和两个COOH质子,这些质子可以与阴离子形成氢键。由于羧基氧的电子性质,与金属离子的配位可以以不同的模式发生。原位配体合成作为一种合成配位聚合物的新方法,越来越受到人们的关注。4,5-咪唑二羧酸(H3IMDC)及其衍生物在金属-有机框架配位聚合物中引起关注的主要原因是它具有6个潜在的给体原子:2个咪唑氮原子和4个羧酸氧原子,并能除去1 ~ 3个氢原子,形成H3-nIMDCn- (n=1、2或3)种。六个援助国可以表现出不同的协调方式,构建美丽的结构。本文综述了4,5-咪唑二羧酸的化学性质及其在配位和超分子化学方面的配位潜力,并将其作为药物合成、药理作用和生物活性的输入;综述了咪唑类杂环分子在金属有机骨架中的配位势。
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引用次数: 3
Adsorption Isotherm of Dibenzyl Toluene and its Partially Hydrogenated Forms Over Phenyl Hexyl Silica 二苄基甲苯及其部分氢化形式在苯基己基二氧化硅上的吸附等温线
Pub Date : 2017-06-22 DOI: 10.4172/2329-6798.1000221
R. Aslam, K. Müller
Liquid organic hydrogen carriers (LOHC) are an interesting option for chemical energy storage and hydrogen transportation. Dibenzyltoluene (H0-DBT), heat transfer oil, is capable of reversibly storing hydrogen emerged as a feasible LOHC system. However, it is not available as a pure compound but consists of an isomeric mixture of 6 to 8 compounds. During the hydrogen storage process a high number of stable intermediate species is formed. These compounds can be categorized into four main classes according to their degree of hydrogenation. To implement H0- DBT as a LOHC system, thermophysical data of these intermediate compounds are required. In our previous work, a reversed phase HPLC method was developed using phenylhexyl silica stationary phase and acetone/water as eluent to separate these partially hydrogenated fractions with a purity >98%. For further designing a batch or continuous HPLC process, adsorption isotherm data are required. In this work, adsorption isotherms for dibenzyltoluene and its partial and fully hydrogenated forms namely hexahydro-dibenzyltoluene, dodecahydro-dibenzyltoluene, and octadecahydrodibenzyltoluene are measured over phenylhexyl silica in acetone/water solvent using the static method. Sip’s equation (Combined Langmuir-Freundlich isotherm) fits the data better as compared to simple Freundlich, Langmuir or competitive Langmuir adsorption isotherms.
液态有机氢载体(LOHC)是化学能量储存和氢运输的一个有趣的选择。二苄基甲苯(H0-DBT)是一种具有可逆储氢能力的导热油,是一种可行的LOHC体系。然而,它不是纯化合物,而是由6至8种化合物的同分异构体混合物组成。在储氢过程中,形成了大量稳定的中间物质。这些化合物根据其氢化程度可分为四大类。为了实现H0- DBT作为LOHC体系,需要这些中间化合物的热物理数据。在我们之前的工作中,我们开发了一种反相高效液相色谱法,以苯己基二氧化硅固定相和丙酮/水为洗脱液分离这些部分氢化馏分,纯度>98%。为了进一步设计间歇式或连续式HPLC工艺,吸附等温线数据是必需的。本文用静态法测定了苯己基二氧化硅在丙酮/水溶剂中对二苄基甲苯及其部分氢化和完全氢化形式六氢二苄基甲苯、十二氢二苄基甲苯和十八氢二苄基甲苯的吸附等温线。与简单的Freundlich、Langmuir或竞争Langmuir吸附等温线相比,Sip方程(组合Langmuir-Freundlich等温线)更符合数据。
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引用次数: 4
Mobile-Phone Based Chemical Analysis - Instrumental Innovations and Smartphone Apps 基于移动电话的化学分析-仪器创新和智能手机应用程序
Pub Date : 2017-06-12 DOI: 10.4172/2329-6798.1000220
M. Trojanowicz
Main trends in development of analytical instrumentation involve design a measuring instruments, which are able to provide the largest possible amount of analytical information about analyzed material, but simultaneously also simplification and scaling-down analytical instruments towards a possible use directly by users without specialized training. Both those development trends are associated with another important tendency, which is the elimination of direct human effort in carrying out different operations in chemical analytical procedures by design of measuring systems, which are mechanized, robotized, or even completely automated involving various contributions of artificial intelligence. One of elements used also for further instrumental progress, is in recent decade the application of mobile phones in further modification of analytical devices for remote and personal use. The potential utility value of a concept to equip mobile-phones in chemical sensors can be considered as a very efficient way for improving the access to a personal analytical devices for instance in bioanalytical applications, smartphone-based biosensors, and integration of microfluidic devices and smartphones.
分析仪器发展的主要趋势包括设计一种测量仪器,它能够提供尽可能多的分析材料的分析信息,但同时也简化和缩小分析仪器的规模,以便用户无需专门培训即可直接使用。这两种发展趋势都与另一个重要趋势有关,那就是通过设计测量系统来消除在化学分析过程中进行不同操作的直接人力,这些测量系统是机械化的,机器人化的,甚至是完全自动化的,涉及人工智能的各种贡献。最近十年来,移动电话应用于进一步改进分析设备,以供远程和个人使用,这也是推动仪器进一步进步的因素之一。在化学传感器中装备移动电话的概念的潜在实用价值可以被认为是改善个人分析设备访问的一种非常有效的方法,例如生物分析应用,基于智能手机的生物传感器,以及微流体设备和智能手机的集成。
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引用次数: 2
Schiff Bases Derived from 2-Hydroxy and 2-Methoxy Naphthaldehyde:Exploration of In Silico Docking, DNA Cleavage, Antibacterial Activitiesand SAR 从2-羟基和2-甲氧基萘醛衍生的希夫碱:硅对接、DNA切割、抗菌活性和SAR的探索
Pub Date : 2017-05-31 DOI: 10.4172/2329-6798.1000219
Devika Bhai Rajamma, Girija Cr, R. Ramakrishna
Antibacterial activities, molecular docking and DNA cleavage activities of five structurally related Schiff bases were performed and their structure activity relationship was studied. Antibacterial activities of these compounds against gram-negative and gram-positive bacteria were evaluated by using well diffusion method and the molecule 1-[(E)-(4- hydroxyphenyl)iminomethyl]naphthalene-2-ol which carries two hydroxyl functional groups was observed as one of the most dynamic antibacterial agents. The antibacterial activities of this molecule was compared with an earlier research work and concluded that the antimicrobial activities of these Schiff base analogues can be improved by introducing OH groups in their core structure. Docking interactions were investigated against p55blk kinase protein. The compound 1-[(E)-(3-nitrophenyl)iminomethyl]naphthalene-2-ol exhibited good docking proficiency with 24 interactions based on statistical potentials and the compound (E)-1-(2-methoxy-1-naphthyl)-N-(3-nitro phenyl)methanimine showed significant docking interaction based on hydrogen bonding. DNA cleavage efficiency of all the Schiff bases was investigated using Lambda DNA by gel electrophoresis method.
研究了5种结构相关的席夫碱的抑菌活性、分子对接活性和DNA裂解活性,并对其构效关系进行了研究。采用孔扩散法研究了这些化合物对革兰氏阴性菌和革兰氏阳性菌的抑菌活性,发现携带两个羟基官能团的1-[(E)-(4-羟基苯基)亚甲基]萘-2-醇分子是最具活性的抑菌剂之一。将该分子的抑菌活性与前期的研究成果进行了比较,认为在这些希夫碱类似物的核心结构中引入OH基团可以提高其抑菌活性。研究了与p55blk激酶蛋白的对接相互作用。化合物1-[(E)-(3-硝基苯基)亚甲基]萘-2-醇具有良好的对接能力,具有24种基于统计电位的对接能力,化合物(E)-(2-甲氧基-1-萘基)- n -(3-硝基苯基)甲亚胺具有显著的基于氢键的对接能力。用Lambda DNA凝胶电泳法研究了所有席夫碱基的DNA切割效率。
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引用次数: 2
Boric Acid Production from a Low-Grade Boron Ore with Kinetic Considerations 低品位硼矿制硼酸动力学研究
Pub Date : 2017-05-22 DOI: 10.4172/2329-6798.1000218
H. Mahdi, M. Davood, Mohsen, S. Behzad
The most important Iranian boron reserves are in the basin of Ghezel Ozan, a river in the West and Northwest area of Zanjan. In the present study, boric acid production from an Iranian low-grade borate ore by hydrometallurgical process was investigated. In order to produce boric acid, boron ore was reacted with sulphuric acid. The influence of four parameters on the course of reaction such as pH, temperature, liquid to solid ratio, and reaction time was examined. Optimum condition for leaching part was obtained in temperature of 90°C, reaction time of 2 hours, L/S ratio of 3, and pH of 1. Under these conditions, the recovery of boron acidic leaching was reported to be 92.21%. Neutralization of pulp was done by lime. Finally, boric acid was obtained by crystallization. The purity of produced boric acid was 99.56%. The data obtained from the acidic leaching kinetics indicated that the dissolution of boron ore is fluid film diffusion controlled reaction and the reaction activation energy equals to 11.6 kJ/mol. Enthalpy of activation and entropy of activation were 11.2 kJ/mol and -246.3 J/(mol.K) respectively.
伊朗最重要的硼储量位于Ghezel Ozan盆地,这是Zanjan西部和西北部地区的一条河流。以伊朗某低品位硼酸矿石为原料,研究了湿法冶金硼酸生产工艺。硼矿石与硫酸反应制备硼酸。考察了pH、温度、液固比、反应时间等4个参数对反应过程的影响。得到浸出部分的最佳条件为温度90℃,反应时间2 h, L/S比3,pH = 1。在此条件下,硼酸浸回收率为92.21%。用石灰对纸浆进行中和。最后结晶制得硼酸。所得硼酸纯度为99.56%。酸性浸出动力学数据表明,硼矿石溶解为流体膜扩散控制反应,反应活化能为11.6 kJ/mol。活化焓和活化熵分别为11.2 kJ/mol和-246.3 J/(mol. k)。
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引用次数: 5
Comparative Study for the Analysis of Cefixime Trihydrate and its Degraded Products by Two RP-HPLC Methods, One its Official and Other Developed Validated Method 两种反相高效液相色谱法分析三水合头孢克肟及其降解产物的比较研究
Pub Date : 2017-05-03 DOI: 10.4172/2329-6798.1000214
Elsadig Hk, A. Mb
The aim of the present work was aimed to carry out comparative study between method (1) and method (2) for separation of cefixime trihydrate and its degraded products by using two different mobile phases, keeping the other parameters such as stationary phase, column condition, wavelength, and device. Mobile phase for method (1) consist of a solution of 0.03 M Tetra butyl ammonium hydroxide (pH 6.5) and acetonitrile with a ratio of 3:1 respectively while Mobile phase for method (2) consist of a mixture of 0.1 M sodium dihydrogen phosphate monohydrate solution (pH 2.5) and methanol with a ratio 3:1 respectively. To study the degraded products sample was subjected to Sun light, UV light, and thermal effects. From data obtained proved the method (2) gave less retention time for the separation of drug with a larger number of decomposed products being detected compared by method (1).
在固定相、色谱柱条件、波长、装置等参数不变的情况下,对方法(1)和方法(2)分离三水合头孢克肟及其降解产物进行了比较研究。方法(1)的流动相由0.03 M四丁基氢氧化铵(pH 6.5)和乙腈的比例分别为3:1的溶液组成,方法(2)的流动相由0.1 M磷酸二氢钠一水溶液(pH 2.5)和甲醇的比例分别为3:1的混合物组成。对降解产物样品进行了光照、紫外光照和热效应的研究。所得数据证明,与方法(1)相比,方法(2)分离药物的停留时间更短,检测到的分解产物数量更多。
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引用次数: 5
On Electrochemical Managing the Properties of Aqueous Coolant 水基冷却剂性能的电化学管理
Pub Date : 2017-04-28 DOI: 10.4172/2329-6798.1000217
Alex, S. er
Liquid water as a chemical compound with the wide band gap is characterized by varying their Fermi level as a linear identifier of water oxidation-reduction potential (ORP). This potential is the management tool for changing chemical properties of the aqueous coolant by forced shifting Fermi level in the band gap at the expense of insignificant deviation (|z| 0) with the negative ORP is realized when Fermi level is shifted to the local donor level, eHO, by electro-reducing the aqueous coolant in the electrochemical cell with the strongly polarized anode and the quasi-equilibrium cathode, occupying eH2O by electrons, and forming hydroxonium radicals, H3O, as the strongest reducers. Opposite, the hyperstoichiometric state (z<0) with the positive ORP is realized in the electrochemical cell with the strongly polarized cathode and the quasi-equilibrium anode when Fermi level is shifted to the local acceptor level, radicals, eOH, as the strongest oxidizers. eOH, forming in water hydroxyl.
液态水作为一种具有宽禁带的化合物,其特点是其费米能级的变化作为水氧化还原电位(ORP)的线性标识符。这种潜在的管理工具是改变水的冷却剂的化学性质迫使移动费米能级在禁带的微不足道的偏差(z | | 0)与消极ORP实现当费米能级转移到当地的施主能级,eHO,通过electro-reducing水溶液冷却剂在强烈极化的电化电池阳极和阴极准平衡,占领eH2O由电子,并形成水合氢自由基,水蒸汽,作为最强还原剂。相反,当费米能级转移到局部受体能级时,具有强极化阴极和准平衡阳极的电化学电池实现了ORP为正的高化学计量态(z<0),自由基eOH是最强的氧化剂。eOH,在水中形成羟基。
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引用次数: 2
Extraction, Characterisation and Industrial Applications of Sesamum indicum Seed Oil 芝麻籽油的提取、表征及工业应用
Pub Date : 2017-04-14 DOI: 10.4172/2329-6798.1000216
Chinweuba Aj, Chen Mn
Oil was extracted from ground Sesamum indicum seeds by solvent extraction method using Soxhlet extractor and n-hexane as the solvent. The percentage oil yield on weight of the dried seeds was 32%. The oil quality parameters were accessed in terms of acid value, free fatty acid value, saponification value, iodine number and peroxide value. The results obtained showed the oil to be non drying oil with iodine value of 76.56 g/100 g and could be used for skin cream production. The acid and free fatty acid values of Sesamum indicum seed oil showed that the oil would not require any purification before use. The saponification value of 55.90 mg/g suggested that the oil could be used for soap production. The results confirmed that the oil could also be used for grease production, alkyd resin and paints.
采用索氏萃取器,正己烷为溶剂,对芝麻籽进行萃取。干籽的出油率为32%。从油品的酸值、游离脂肪酸值、皂化值、碘值、过氧化值等方面确定了油品的品质参数。结果表明,该油为非干性油,碘值为76.56 g/100 g,可用于护肤霜生产。芝麻籽油的酸值和游离脂肪酸值表明,芝麻籽油在使用前不需要任何纯化。皂化值为55.90 mg/g,可用于肥皂生产。结果表明,该油还可用于油脂生产、醇酸树脂和涂料。
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引用次数: 2
Verification of Phase Diagrams by Three-Dimension Computer Models 用三维计算机模型验证相图
Pub Date : 2017-03-15 DOI: 10.4172/2329-6798.1000215
Lutsyk, Vorobeva
Present paper is the survey of the works, dedicated to the elimination of contradictions in the publications, which describe the calculated and/or experimental results of investigations of the three-component systems phase diagrams. Special approach to the construction of phase diagrams in the form of their assembling from the surfaces and the phase regions into the three-dimensional (3D) computer model as the effective tool of the detection of the incorrect interpretation of the obtained experiment or of errors in the thermodynamic calculations of the phase diagrams fragments, caused by a deficiency in the initial information, is proposed. 3D computer models of Au-Ge-Sn, Au-Ge-Sb, Ag-Au-Bi, Ag-Sb-Sn, Au-Bi-Sb T-x-y diagram are considered.
本论文是对著作的综述,致力于消除出版物中描述三组分系统相图研究的计算和/或实验结果的矛盾。提出了一种将相图从表面和相区组装成三维计算机模型的特殊方法,作为检测实验结果的错误解释或由初始信息不足引起的相图片段的热力学计算错误的有效工具。考虑了Au-Ge-Sn、Au-Ge-Sb、Ag-Au-Bi、Ag-Sb-Sn、Au-Bi-Sb的三维计算机模型。
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引用次数: 2
Cross-linked and neutralized hyaluronic acid-based drug delivery systems 交联和中和透明质酸为基础的药物输送系统
Pub Date : 2017-03-01 DOI: 10.4172/2329-6798-c1-009
pAdam Juhaszp
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引用次数: 2
期刊
Modern Chemistry & Applications
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