一个2-ptz/Cu链修饰的八钼酸基配合物的合成、结构及电化学性质

利用2-吡啶基四氮唑(简称为2-ptz)作为有机配体,通过水热技术合成了一个基于八钼酸的配合物,Cu3(H2O)8(2-ptz)2[β-Mo8O26]·2H2O(1),并通过X-射线单晶衍射、红外光谱和元素分析等方法,对化合物的结构进行了表征.在化合物1的结构中,[Mo8O26]4-多阴离子将具有双核Cu结构的建筑单元{Cu2(2-ptz)2},连接成为一维的链状结构,其进一步由Cu2+离子拓展为二维的层状结构.另外,电化学研究表明,多阴离子的电化学性质在化合物的结构中仍被保持.     

三维杂核Ni（II）－Sm（III）配合物的合成、晶体结构及性质研究

利用过渡金属镍盐、稀土盐与5-异烟酰胺吡啶基异酞酸水热合成了杂核化合物{[NiSm2(INAIP)4(H 2 O)4]?2 H 2 O}n (1)(INAIP2－＝异烟酰胺吡啶基异酞酸根),并对其进行了元素分析、IR 及 X-射线衍射法表征。晶体结构研究表明：配合物1属于三斜晶系,P－1空间群。配合物1是由配体异烟酰胺吡啶基异酞酸连接稀土钐离子形成二维层状结构,该二维层通过 Ni-O 和 Ni-N 键连接成三维非贯穿网络结构。配合物1脱水分子后具有稳定微孔结构,对二氧化碳具有一定吸附而对氮气无吸附作用。此外,配合物1还具有典型的稀土钐离子红色荧光性能。     

两个钒同多酸化合物的光谱测试

水热法合成了两个新的钒同多酸化合物[H_2en]_(3n)[V_6O_(18)]_n(化合物1)和[Cu(en)_2]_3[V_(10)O_(28)]·6H_2O(化合物2)。通过X射线单晶衍射确定化合物1属于三斜晶系,呈一维链状结构;化合物2属于单斜晶系,为孤立结构。二维红外相关光谱显示钒多酸阴离子骨架及N—H…O氢键对外界热微扰比较敏感,固体紫外漫反射光谱反映了结构中O→V的荷移跃迁,热重分析揭示多酸化合物热稳定性及结构变化,高温红外测试进一步验证随着温度变化,游离水、游离有机胺分子、胺合金属阳离子的脱除顺序。     

均苯三酰胺甘氨酸配合物镉(Ⅱ)的合成与表征

均苯三酰胺甘氨酸(L)与Cd(NO3)2·6H2O加入到20mlH2O/DMF(2:1)溶液中,高压釜下加热到200℃,并保持12小时,生成一种新的化合物[Cd3(L)2(DMF)(H2O)5]n,并用荧光光谱、红外光谱,XRD和元素分析等手段对其结构进行了表征.     

1,2-二水杨醛腙的合成和晶体结构

水杨醛与水合肼在乙醇溶液中反应,生成标题化合物(C14H12N2O2),经X-射线单晶结构分析表明此晶体属单斜晶系,P21/n空间群,a=8·5303(16),b=6·3117(12),c=11·828(2),β=107·943(3)°V=605·8(2)3,Z=2,μ=0·090mm-1,DC=1·317g/cm3,F(000)=252。结果表明,该化合物的二个苯环处于同一平面,并且存在分子间C—H…O的氢键连接。     

一个二维镉配位聚合物的合成、结构及荧光性能研究（英文）

在水热条件下,一个新的二维镉配位聚合物{[Cd(1,3-PDA)(ppene)]·H_2O}n(1)通过Cd(NO_3)_2?4H_2O,1,3-phenylendiacetic acid以及4-pyr-poly-2-ene的反应而被合成.该化合物通过红外光谱,元素分析以及X-射线单晶衍射进行了表征.X-射线单晶结构分析表明,该化合物属于三斜晶系,Pī空间群,晶胞参数:a=9.524 8(19),b=10.430(2),c=1.138 9(2)nm,α=88.65(3)°,β=86.79(3)°,γ=69.70(3)°,V=1.059 5(3)nm3,Z=2,R1=0.030 4,w R2=0.074 8.CCDC号为1038885.化合物1为一个二维(4,4)网格结构的网络.我们对该化合物的荧光性质也作了研究.     

配合物{[Gd_2(Hpimda)_2(μ_4-C_2O_4)·2H_2O]·2H_2O}_n的合成、结构及性质研究

通过水热法成功合成一个新的含N杂环二羧酸配体和草酸根离子的稀土配合物,其结构式为{[Gd2(Hpimda)2(μ4-C2O4).2H2O].2H2O}n(H3pimda为2-(吡啶-4-基)-1H-4,5-咪唑二羧酸),并对该配合物进行了表征.结构分析表明该配合物呈现草酸根离子作为柱子的三维框架结构,H3pimda配体把Gd(Ⅲ)离子连接成二维层状结构,进一步堆积形成一维通道,其中容纳着自由水和配位水分子.磁性研究表明,一维链内相邻的两个顺磁中心Gd(Ⅲ)离子之间存在着弱的反铁磁相互作用.     

由对苯二甲酸和1,3-双(咪唑基-1-甲基)苯构筑的锌配合物的水热合成及晶体结构

以Zn(NO3)2·6H2O、对苯二甲酸(H2BDC)和1,3-双(咪唑基-1-甲基)苯(mbix)为原料,采用水热法合成了二维网状配位聚合物[Zn(BDC)(mbix)]n(1),并对其进行了元素分析、红外光谱、荧光光谱和X-射线单晶衍射测定.该配合物属于三斜晶系,P-1空间群,a=9.6216(18),b=9.7009(18),c=11.855(2),α=108.286(3),β=103.830(3),γ=91.922(3)°,V=1013.1(3)3,Z=2,Dc=1.533g/cm3,μ=1.250mm-1,F(000)=480,R1=0.0294,wR2=0.0704.     

两个具有新型拓扑结构配合物的制备

柔性三脚架配体1,3,5-三(1,2,4-三氮唑-1-亚甲基)-苯(ttmb)和有机金属双羧酸1,1'-双(3-羧酸-1-丙基)-二茂铁(H2bfcs)与Cd(Ac)2·2H2O或Cd Cl2·2.5H2O的自组装反应生成了两个未被报道过的二维(2D)双节点(3,4)-连接(42·6)(42·63·8)型配合物{[Cd2(bfcs)(Hbfcs)2(ttmb)2]·10H2O}n(1)和[Cd Cl(Hbfcs)(ttmb)]n(2)。这两个配合物都是平面层状结构,不同的是,1是由有机金属双羧酸阴离子bfcs2-连接一维(1D)波形梯子链形成的,而2是由无机阴离子Cl-作为链接形成的。     

锌和镉与均苯三酰胺甘氨酸配合物的合成与荧光性能研究

以均苯三酰胺甘氨酸为配体,合成了[Zn3L2·15H2O]n(1)和[Cd3L2·DMF·7H2O]n(2)(L=均苯三酰胺甘氨酸,DMF=N,N-二甲基甲酰胺).并对其进行了元素分析、红外光谱、热重分析、X-射线粉末衍射和荧光光谱测定,与配体相比,[Zn3L2·15H2O]n(1)和[Cd3L2·DMF·7H2O]n(2)的荧光光谱发生了不同程度的红移和蓝移,其最大发射峰分别在467nm和428nm.     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Social and Cultural Influence on Word Meaning

Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.