Cryptands翻译

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August undefined, 2024

WebThe cryptands are three-dimensional, cation-enveloping host compounds that normally contain nitrogen and oxygen donors but may contain sulfur or other heteroatoms as well. … WebLes cryptands sont une famille de ligands synthétiques bicycliques ou polycycliques pour une sorte de cation. En 1987, le prix Nobel de chimie a été attribué à Donald J. Cram, Jean-Marie Lehn, et Charles J. Pedersen pour leur travail sur les utilisations des cryptands et les éthers couronnes, ce qui a donné naissance au domaine de la ...

Cryptands and Cryptates

WebCryptands were introduced by Jean-Marie Lehn in 1969 as cage-shaped selective ligands for alkali and alkaline-earth metal ions, which lie at the heart of supramolecular chemistry. This book reports on much of the research in the field since the '70s, and looks at, amongst other topics, metal coordination chemistry, anion coordination chemistry ... Web搜狗翻译可支持中、英、法、日等50多种语言之间的互译功能，为您即时免费提供字词、短语、文本翻译服务。 ons usp 800

Chapter III Cryptands - Virginia Tech

Web百度翻译提供即时免费200+语言翻译服务，拥有网页、app、api产品，支持文本翻译、文档翻译、图片翻译等特色功能，满足用户查词翻译、文献翻译、合同翻译等需求，随时随 … Webcryptand ( plural cryptands ) ( chemistry) any of a class of polycyclic compounds related to the crown ethers, having three chains attached at two nitrogen atoms. This page was last … WebCryptands are a family of synthetic bi- and polycyclic multidentate ligands for a variety of cations. The Nobel Prize for Chemistry in 1987 was given to Donald J. Cram , Jean … iola wi recycling center

Cryptand - an overview ScienceDirect Topics

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WebAs seen in Figure 14 the ellipsoidal cryptands may be prepared by the simultaneous formation of three bridges. This route has found limited use due to low yields but has been employed in the synthesis of some cryptands including the tris-pyridino system (36) 〈81TL3035〉 and bis-tren (18) 〈80UP52100〉.The presence of nitrogen bridgeheads … In chemistry, cryptands are a family of synthetic, bicyclic and polycyclic, multidentate ligands for a variety of cations. The Nobel Prize for Chemistry in 1987 was given to Donald J. Cram, Jean-Marie Lehn, and Charles J. Pedersen for their efforts in discovering and determining uses of cryptands and crown ethers, thus launching the now flourishing field of supramolecular chemistry. The term cryp… ons usf profileWebLes cryptands sont une famille de ligands synthétiques bicycliques ou polycycliques pour une sorte de cation. En 1987, le prix Nobel de chimie a été attribué à Donald J. Cram , … onsv.ch

"WebJul 4, 2024 · Texas A&M University-Commerce. The key difference between crown ethers and cryptands is that crown ethers are cyclic structures containing ether groups, whereas cryptands are either cyclic or non ... " - Cryptands翻译

Cryptands翻译

Web1.百度翻译. 老牌好用的翻译软件，支持200多种语言的互译，同时拥有文字翻译、文档翻译、截图翻译、划词翻译等多种翻译模式。. 软件的文档翻译就能轻松帮我们解决PDF翻译的难题，我们在软件主界面中点击“文档翻译”便能进入文档翻译操作界面。. 在界面 ... WebThe cryptands have the same kind of properties as the crown ethers and the same uses. In general, they form much more strongly bound complexes and can be used to stabilize unusual ionic species. For example, it is possible to produce the negative Na− ion in the compound [(2,2,2)-cryptand-Na]+Na−, which is a gold-coloured crystalline ...

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WebJun 8, 2010 · Cryptands including azacryptands play a crucial role in the synthesis of alkalide and electrides. 969 The first barium sodide [Ba{H 5 aza(2.2.2)crypt}] + Na − was … Webcrypto翻译：加密货币（cryptocurrency 的缩写）, 加密（encryption 的缩写）, 隐藏的；秘密的。了解更多。

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WebCryptands spherands Cross-fertilisation between the crown ethers (or, more generally, corands), cryptands, spherands and podands has produced an enormous range of … WebOct 27, 2024 · # Cryptands# application of Cryptands#structure of Cryptands# property of Cryptands# difference between crown ether and Cryptands

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WebCryptands, or macrobicyclic ligands, are similar in structure to crown ethers, differing in the addition of a bridge that reaches across the ring to give football-shaped structures such as compound 4 in Fig. 1.The trivial nomenclature used for these ligands is given by the number of ethylene oxide units in each of the three bridges connecting the two nitrogen … onsuzWebNov 26, 2024 · The chemistry of the alkali metals is dominated by the stability of the +1 oxidation state and the noble gas configuration of the M + cation. The alkali metals all have low first ionization energies (Table 3.2. 3 .6) but very high second ionization energies. Element. 1st ionization energy (kJ/mol) Li. 526. onsu sl flickrWebJan 24, 2024 · The more rigid the three-dimensional structure of cryptands, the higher is the selectivity and specificity of similar-sized crown ethers. Summary. In the article about Crown ether, you have gained knowledge about the meaning and structure of crown ethers with suitable examples. You have also understood the naming of crown ethers, how … onsuttonplacehomeblogWebCryptands III.1 Introduction Like crown ethers, cryptands were designed and synthesized as binding receptors of smaller molecular substrates. A simple definition of a cryptand is a bicyclic (or polycyclic) ligand.1 This definition was derived from Lehn's observations of the behavior of cryptands with alkali metals. ons utah chapterhttp://fanyi.youdao.com/ ons vacs 01Webplural of cryptand ... Definition from Wiktionary, the free dictionary iola wisconsin weather radarWebVerfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Deprotonierung in Gegenwart von Kronenethern, Kryptanden, Podanden, Polyethern oder Aminen durchgeführt wird. Process according to Claim 7, characterized in that the deprotonation is carried out in the presence of crown ethers, cryptands, podands, polyethers or amines. … ons vat registered businesses