查询词典 selenides

It was found that solvent pyridine plays an important role in the formation of nanocrystalline nickel selenides due to its appropriate coordinative ability and alkalescence.

又在50℃的温度下，在吡啶溶剂中以水和肼为还原剂，得到了Ni〓Se和NiSe〓，纳米晶溶剂吡啶由于具有合适的配位能力及碱性而在反应中起了关键作用。

Many sulphides, selenides, and telluides have the nickel arsenide, NiAs, type of structure.

许多硫化物、硒化物和碲化物具有砷化？？iAs型的结构。

Many sulphides, selenides, and telluides have the nickel arsenide, N iAs , type of structure.

许多硫化物、硒化物和碲化物具有砷化？？ ias 型的结构。

Many sulphides, selenides, and tellurides have the nickel arsenide's NiAs type of structure

许多硫化物，硒化物和碲化物具有砷化镍NiAs型的结构。

This is the selenide which possesses the largest Metal/Non-metal ratio in ternary layered Nb/Ta selenides found so far.

〓 这是迄今得到的金属含量最高的三组元层状铌、钽硒化物。

It is widely distribute d, usually in small amounts, occasionally uncombined but more often as selenides of iron, lead, silver, or copper.

通常以小量广泛分布，偶尔出现游离状态，但往往是以铁、铅、银或铜的硒化物出现。

The millimetersized tubular crystal selenium was first prepared. By studying the process of treating selenium in ethylenediamine, we proposed the mechanism of the preparation of selenides under solvothermal condition. The selenides came into being from the reaction of metal ions with Se〓, which was obtained by the amine attacking selenium. Moreover, a new precursor to prepare nanocrystalline selenides at room temperature was obtained. From this precursor, we have prepared nanocrystalline silver selenides, copper selenides, lead selenides and cadmium selenides nanorods.

首次报道了采用溶剂热处理的方法制备出厘米尺度的管状结构硒晶体；通过对硒粉在乙二胺中的溶剂热研究，初步探讨了以单质硒为硒源的溶剂热合成硒化物的反应机理应是硒受胺类的亲核进攻变成Se〓而进一步形成相应的硒化物；获得了合成硒化物纳米晶的前驱物，并在室温条件下合成了硒化银、硒化铜、硒化铅纳米晶和硒化镉纳米棒等。

It was shown that the insertion of In into solid phase may proceed underpotential deposition mechanism involving two different routes: In(superscript 3+) reduction by induced effect of Cu3Se2, and/or reaction with H2Se. The newly generated In and indium selenides may be assimilated into the formation CuInSe2 by reaction with copper selenides.

研究结果表明，铟进入固相是通过In(上标 3+)受Cu3Se2诱导作用欠电势还原或者In(上标 3+)与H2Se反应这两种途径实现；先沉积的Cu3Se2与新生成的铟或铟硒化合物反应最后生成CuInSe2。

Selenium; Se Grignard Reagent; Organic selenides; symmetry selenides; unsymmetry selenides; synthesis

工程科技I，化学，有机化学硒；硒格氏试剂；有机硒化合物；对称硒醚；不对称硒醚；合成

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要进一步探索了2-羟基烷基苯基硒醚、α-苯硒基丙酸试剂在制备多取代乙烯和杂环化合物反应中的应用，具体研究内容和结果如下：一、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羟基烷基硒醚和O-乙基膦酸单酯发生Mitsunobu反应，无需分离和纯化反应中间体，直接使用30 %的双氧水进行氧化-消除反应，提供了&两步、一锅&合成O-乙基-O-乙烯基膦酸酯的新方法，该方法反应条件温和，操作简便，产物收率良好(76-82 %)。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。