金属银离子与四氯二苯并对二恶英相互作用及其表面增强拉曼光谱的研究

本文基于DFT方法计算了2,3,7,8-四氯二苯并对二恶英(2,3,7,8-TCDD)结构和振动性质。为了考察分子与金属表面的吸附和相互作用,建立了两种金属银离子与2,3,7,8-TCDD分子的复合体系,计算了它们的分子结构、电子结构和振动性质。基于计算结果详细分析了结构的变化、金属离子与分子中不同原子之间的相互作用;另外,根据不同体系拉曼散射强度的变化,对拉曼强度变化较大的特征振动进行了分析和讨论。文中给出的计算结果可用于指导相应的实验研究。     

嵌入式超薄碳糊电极的研究及其应用

在镍铬合金基体上,研制了一种新颖的嵌入式超薄碳糊膜电极。该电极可用作银离子的伏安测定。峰电流与Ag 离子浓度在1.0×10-10～1.0×10-6mol/L范围呈良好的线性关系,检出限为8.0×10-11mol/L。     

Synthesis and antibacterial activity of new layered perovskite compounds, AgxNa2-xLa2Ti3O10

Three kinds of new layered perovskite compounds with Ruddlesden-Popper(R-P)phase,Ag_xNa_(2-x)La_2Ti_3O_(10)(x=0.2,0.3 and 0.5),were synthesized by an ion-exchange reaction of Na_2La_2Ti_3O_(10)with AgNO_3 solution.The structures of the compounds were characterized by EDX and XRD,and their antibacterial activity and light-resistance property were evaluated.The results indicated that the molecular formula of Ag_xNa_(2-x)La_2Ti_3O_(10)(x=0.2,0.3 and 0.5)was confirmed,and that the crystalline structure of Na_2La_2Ti_3O_(10)was not obviously affected by exchange of silver ion.The minimum inhibitory concentrations(MICs)of Ag_(0.3)Na_(1.7)La_2Ti_3O_(10)against Escherichia coli(E.coli),Staphylococcus aureus(S.aureus)were 180μg/mL and 240μg/mL, respectively,while its discoloration was not observed after 24 h light ageing test.     

银离子与聚酰胺-胺型树形高分子配位作用的研究

The complexation between poly(amidoamine) (PAMAM) dendrimers and silver ion was studied in this paper. The results showed that generations and surface groups of dendrimers， reaction time， pH value， mole ratio of Ag⁺/PAMAM dendrimers， as well as reaction temperature strongly influence complexation between Ag⁺ and PAMAM dendrimers. The maximum complexing number of Ag⁺ that amino-， hydroxyl- and carboxylate- terminated PAMAM dendrimers could bind has been obtained. It has been found that the measured value of amino- and hydroxyl- ter-minated PAMAM is almost similar to the theory value， but to carboxylate- terminated PAMAM， there is a dis-crepancy between the measured value and theory value because of the electrostatic interaction between the silver ion and carboxyl group.     

含硫弱酸性酚醛树脂对Ag+的吸附性能

含硫配位原子的螯合树脂对过渡金属离子尤其是贵金属离子具有良好的吸附性能[1]。螯合树脂的母体交联聚苯乙烯、聚甲基丙烯酸甲酯[2]具有疏水性,即使引入螯合基团其疏水性仍很强,对在水溶液中的吸附很不利。而含有酚醛骨架的螯合树脂具有亲水性[3]。本文以酚醛树脂为大分子骨架,通过化学反应连接上具有强配位原子硫的巯基羧酸,研究了该巯基弱酸性酚醛树脂对Ag+在各种条件下的吸附性能。1　实验部分1 1　仪器与试剂NicoletMAGNA550(SeriesⅡ)红外光谱仪,SHA C水浴恒温振荡器,3200原子吸收分光光度计,JSM 5600LV扫描电镜,Quest.le…     

新型杯芳烃银离子选择电极的研究

报道了５,１１,１７,２３－四（１,１－二甲基乙基）－２５,２７－二羟基２６,２８－二「２－乙基硫）乙氧基」杯「４」芳烃为银离子载体的ＰＶＣ膜电极的研制。该银离子选择电极不仅对银离子有良好的灵敏度和高选择性,在１０＾－１－１０＾－５ｍｏｌ／Ｌ浓度范围内有良好的线性,能斯特响应为５６ｍＶ／ｐｅＡｇ．（２５℃）碱金属、碱土金属及过渡金属离子不干扰银的测定;而且对某些阴离子也表现出近似能斯特响应（５０ｍＶ／ｐｃｘ－）。用该电极对人工试样中银含量进行测定,结果与原子吸收光度法相符。     

Synthesis and Absorption Properties of Calix[6]amides—based Polymers

Reacting calix[6]arene hexaesters with poly(ethyleneimine),a series of calix[6]amidesbased polymers were obtained for the first time.It is found that they show high absorption capacities towards soft cations comparing to hard cations,and the absorption abilities enhanced with the increasing of calixarene content,which may indicates the cavity of calixarene plays crucial role in absorption.Polymer 2c shows good selective absorption capability towards Ag^ among the tested cations.     

A Three-dimensional Heteronuclear Polymer of [Ag2Fe（SCN）5（DMF）]n Containing Channels and One-dimensional Ag2S2-S-Ag2S2 Chains with Ag…Ag Interaction

Introduction So far, considerable attention has been paid to mag-netic interaction between two different metal ions.1-3 As a potential bridging ligand, thiocyanate can coordinate to a harder metal center with N atom and softer ones with S atom at the same time, resulting in the formation of small ferromagnetic coupling.2 On the other hand, the Fe(III) atom is a good candidate as a hard acid and Ag(I) is a good candidate as a soft acid, so that the Fe(III) centers could be expected to conn…     

基于核壳金@铂纳米粒子的Ag~+比色检测方法

金核铂壳纳米粒子(Au@Pt NPs)具有出色的类过氧化物酶活性,而Ag~+对其催化活性表现出强烈的抑制;基于此,构建了高灵敏的Ag~+比色检测方法。在最佳反应条件下,Au@Pt NPs比色检测Ag~+的线性范围为0.1~10 nmol/L,检出限可达0.05 nmol/L。该方法对汞离子(Hg2~+)也表现出高灵敏的响应,比色检测Hg2~+的线性范围为10~200 nmol/L。将其应用于实际水样中Ag~+的检测,在添加浓度为10,50,100 nmol/L时,回收率为83.8%~97.7%,相对标准偏差为3.0%~9.6%,该方法具有操作简单、灵敏度高、成本低等优点。     

菊苣酸在高效液相色谱测定过程中与流动相中银离子配位的探讨

菊苣酸是紫锥菊属植物中的一种水溶性酚酸类化合物.本研究对紫锥菊提取物中菊苣酸检测的条件是:流动相为V(乙腈)∶ V(去离子水)=38∶ 62(含0.8%冰醋酸和8 mmol/L AgNO3);色谱柱为Restek Pinnacle 11 C18柱(250 mm×4.6 mm, 5 μm);流速为0.5 mL/min;进样量为10 μL;检测波长为326 nm.实验发现,在流动相中添加AgNO3后可以明显改善菊苣酸测定效果,提高分离度,并有效除去其它杂质成分的干扰, r大于0.99;检出限为8～40 mg/L,此方法的相对标准偏差小于3.0%;平均回收率为98.5%,方法符合测试要求.AgNO3改善分离效果的原因可能为菊苣酸和Ag 之间存在一定的配位作用,改变了菊苣酸的性质,扩大了与杂质成分的结构差异,从而使测定更准确,同时用红外和紫外光谱辅助解释了可能的配位机理和配位点.