共查询到20条相似文献，搜索用时 240 毫秒
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合成了Eu(3-PYA)3.2H2O配合物，通过元素分析和化学分析确定了配合物的组成，测定了标题配合物的激光拉曼光谱，结果表明，标题配合物的羟基具有两种配位方式，分别为双齿和桥式，经与同构配合物Sm2(3-PYA)6.4H2O的晶体结构测定结果对照，知标题配合物中有一种Eu(Ⅲ）格位，中心离子的配位数为8。 相似文献
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合成了新的巯基乙酸、异烟酰肼合锑(Ⅲ)三元配合物:[Sb(C2H2O2S)·(C2H3O2S)·C6H8N3O]Cl。经元素分析、X-射线粉末衍射、中红外、远红外光谱进行表征,确定了配合物的组成和结构。对XRD谱指标化,确定其晶系和晶胞参数,[Sb(C2H2O2S)·(C2H3O2S)·C6H8N3O]Cl:a=1.1858nm,b=2.3671nm,c=1.3850nm,β=87.67°;锑(Ⅲ)离子是通过N原子、S原子和O原子参与配位形成五配位的配合物。并对配合物进行了抑菌活性研究。 相似文献
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为探究配体维生素B3(C6H5NO2)、8-羟基喹啉(C9H7NO)及其稀土配合物[RE(C6H4NO2)2(C9H6NO)].2H2O(RE=La、Nd、Sm)对红酵母生物活性的影响,本实验采用平板培养皿法和抑菌圈法测定了上述三元配合物及其配体对野生红酵母和实验红酵母生长活性的影响通过比较分析抑菌圈直径的大小,我们发现8-羟基喹啉(C9H7NO)对红酵母抑制作用较强,而维生素B3没有抑制作用,与稀土(RE=La、Nd、Sm)形成三元配合物后,Sm的三元配合物抑菌能力得到了加强,而Nd和La的三元配合物抑菌能力减弱初步推测Sm配合物可应用于红酵母危害的防治 相似文献
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合成了绿原酸合镧(Ⅲ)配合物，通过元素分析、红外光谱、热重分析和化学分析，确定配合物的组成为：[La(C16H17O9)3]．2H20。测试配体和配合物分别对革兰氏阴性茵(大肠杆菌)和革兰氏阳性茵(金黄色葡萄球菌)的抗茵活性，结果表明：配合物对大肠杆菌的抗茵活性比配体明显增强，但对金黄色葡萄球菌的抗茵活性反而比配体弱。 相似文献
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研究了H2TBP，H2TP（o-NO2)TBP的Sn(Ⅳ）和Mn(Ⅲ)配合物的电化学性质，并用Nicholson方法测这了上述配合物的非均相电子传递速率常数。 相似文献
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陈经涛 《山东教育学院学报》2003,18(5):93-94
将钴(Ⅱ)氨配合物的生成置于液体石蜡封闭的除氧溶液中进行，可以得到黄色的[Co(NH3)6]Cl2配合物，避免了把[Co(NH3)6]Cl2、Co(NH3)6]Cl3二混合溶液的颜色当作单纯[Co(NH3)6]Cl2的颜色的错误，表明了钴(Ⅱ、Ⅲ)氨配合物的生成、结构和性质的关系。CuCl2和过量的铜屑在浓盐酸介质中加热约1—2分钟全部生成H[CuCl2]的无色溶液，将其直接倾入蒸馏水中便可得到大量CuCl的白色沉淀；再在用液体石蜡隔绝空气的CuCl固体中分别加入浓氨水和浓盐酸，即很容易生成H[CuCl2]、[Cu(NH3)2]Cl的无色配合物。操作方法简单，现象明显，结果与理论一致。 相似文献
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通过选用HCOOH,Ni(NO3)2,6H2O,CoCl2.2H2O等为原料,合成两种具有相同的?1,3-HCOO-桥联Ni2 和Co2 的三维孔洞结构的配合物[Ni(HCOO)2]n(1)和同样具有三维孔洞配合物[Co(HCOO)2]n.2H2O(2),通过水热和H-管扩散的方法得到了相同的两种配合物的晶体并用X-R A Y单晶衍射的方法表征了两种化合物的晶体结构。此外还测定了配合物1和2的电化学性质。 相似文献
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刘艳华 《赤峰学院学报(自然科学版)》2012,(10):18-20
以2,2'-联苯二甲酸(H2dpa)、Eu2O3、乙醇、水为原料,通过水热合成法合成了配合物[Eu2(dpa)3(H2O)2]n(1),并通过X射线单晶结构分析、元素分析以及红外光谱、荧光光谱对配合物进行了表征. 相似文献
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在常规条件下 ,当 pH值为 3,Ge与H8X的物质的量比为 1∶1时 ,合成了乙二胺四甲叉膦酸 (简称EDTMP)与锗的固体配合物 ,用元素分析、红外光谱和热分析进行了表征 .配合物的组成为 :GeH4X·4H2 O ,X =(O3 PCH2 ) 2 NCH2 CH2 N(CH2 PO3 ) 2 .配合物具有一维链状配位聚合结构 . 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
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. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
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. 相似文献
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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. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
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. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
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。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献