排序方式: 共有74条查询结果,搜索用时 203 毫秒
11.
12.
13.
镧系四元混配化合物[Ln(BA)2(NO3)(phen)]2的合成、晶体结构和波谱研究 总被引:3,自引:0,他引:3
在酸性介质、含水溶剂中合成了四元混配化合物[Ln(BA)2(NO3)(phen)]2(BA=苯甲酸根;Ln=La,Ce,Pr,Nd,Sm,Eu,Dy,Gd,Tb,Er),用元素分析、IR、DTA-TG等方法对配合物进行了表征.研究了配合物的顺磁性能和荧光性能.镨配合物的单晶衍射结果表明,配合物属三斜晶系,双核,Pr3+的配位数为9,4个BA呈二种配位方式,丰富了四元配合物的结构表现形式. 相似文献
14.
3-X-2(1H)-吡啶酮互变异构体系的理论计算 总被引:2,自引:0,他引:2
2(1H)-吡啶酮类化合物常呈现出诱人的生物活性[1,2].由于酮式和烯醇式结构具有互变异构化性质,因此确定其互变异构平衡体系中的优势结构及研究取代基对平衡体系的影响,对阐明该类化合物的生物活性及进行构效关系的研究有着重要的意义.当其3-位含有可与2-位羰基或2-位羟基形成分子内氢键的基团时,势必对互变异构平衡产生影响.基于该类化合物的互变异构平衡有着强烈的溶剂效应[3],本文对3-X-2(1H)-吡啶酮(X=NO2,NH2,COOH)及其烯醇式互变异构体分别在气相和溶液中进行了理论计算,考察了… 相似文献
15.
镧系四元混合配体配合物[Ce(CH2ClCOO)2(NO3)(phen)(H2O)]2的晶体结构、芳环堆积效应和2D氢键网络 总被引:2,自引:0,他引:2
The quaternary complex, [Ce(CH2ClCOO)2(NO3)(phen)(H2O)]2, was synthesized. Interestedly, the title compound is a dimer comparing with the 1D polymer [La(CH2ClCOO)2(NO3)(phen)*(H2O)]n and powder compound [Nd(CH2ClCOO)2(NO3)(phen)]. In the title compound there is a monodentate NO-3, which is a first example in the all synthesized quaternary mixed anion complexes, and the NO-3 extended the complex into a 2D network with water from other molecules by inter-molecular hydrogen bonds. The intermolecular hydrogen bonds lead to the weaker Ce—O(COO), Ce—O(NO3) and Ce—N bonds comparing with other quaternary mixed anion complexes of cerium. Also the stacking effect, which makes the compound more stable in the situation of weaker Ce—O and Ce—N bonds, was first found in the series compounds. 相似文献
16.
[La(CH2ClCOO)2(NO3)(phen)(H2O)]n的合成和晶体结构 总被引:5,自引:0,他引:5
合成了混合阴离子配合物[La(CH2ClCOO)2(NO3)(phen)(H2O)]n。配合物经元素分析、IR、DTA-TG和UV等表征。用X射线单晶结构分析解析了标题配合物的晶体结构,三斜,空间群P1,晶胞参数为a=10.533(2)?,b=13.136(3)?,c=7.776(1)?,α=96.59(1)°,β=95.76(1)°,γ=108.42(2)°,V=1003.3(3)?3,Z=2,Dc=1.940 g/cm3, F(000)=572, μ(Mo Kα)=24.36 cm-1。 相似文献
17.
18.
One—dimensional Network Constructed by Salicylate and Phenanthroline Ligands with Copper(Ⅱ) 总被引:2,自引:0,他引:2
A novel complex,[Cu2(phen)(sal)(Hsal)2]n(1),was synthesized and structurally characterized.The basic dimeric units are hold by sal ligands and extended into 1-D network.The carboxylate grougs of salicylates coordinate to the central ion in three different coordination modes:chelating,bridging and bridging-chelating.In the case of bridging-chelating of the carboxylate group of the salicylate,all three oxygen atoms of salicylate are bidentately coordinated to copper ion,namely,μ4-η^3 binding mode. 相似文献
19.
0引言水杨酸具有羧基和羟基,是双功能基配体,羧基和羟基可分别脱去氢,因此有多种形式可参与配位(见Scheme1),其中Hsal-1的形式仅见一例报道犤1犦,其可靠性有待更多的研究来确证。对铜/水杨酸/吡啶三元体系的研究已有多篇文献报道犤2~4犦,亦有几种化合物合成,例如Cu(Hsal)2(py)2和Cu(sal)(py)2等。配合物Cu(sal)(py)2的可靠性值得怀疑,原文中无合成和表征犤3犦。铜/水杨酸/吡啶衍生物三元体系已有多个晶体结构报道犤5,6犦,但迄今无铜/水杨酸/吡啶三元体系晶体结构报道。对于配合物Cu(Hsal… 相似文献
20.