In chemistry, a pincer ligand is a type of chelating agent that binds tightly to three adjacent coplanar sites, usually on a transition metal in a meridional configuration.[1] The inflexibility of the pincer-metal interaction confers high thermal stability to the resulting complexes. This stability is in part ascribed to the constrained geometry of the pincer, which inhibits cyclometallation of the organic substituents on the donor sites at each end. In the absence of this effect, cyclometallation is often a significant deactivation process for complexes, in particular limiting their ability to effect C-H bond activation. The organic substituents also define a hydrophobic pocket around the reactive coordination site. Stoichiometric and catalytic applications of pincer complexes have been studied at an accelerating pace since the mid 1970s. Most pincer ligands contain phosphines.[2] Reactions of metal-pincer complexes are localized at three site perpendicular to the plane of the pincer ligand, although in some cases one arm is hemi-labile and an additional coordination site is generated transiently. Early examples of pincer ligands (not called such originally) were anionic with a carbanion as the central donor site and flanking phosphine donors and are referred to as PCP pincers.
Although the most common class of pincer ligands features PCP donor sets, variations have been developed where the phosphines are replaced by thioethers and tertiary amines. Many pincer ligands also feature nitrogenous donors at the central coordinating group position (see figure), such as pyridines.[3]An easily prepared pincer ligand is POCOP. Many tridentate ligands types occupy three contiguous, coplanar coordination sites. The most famous such ligand is terpyridine (“terpy”). Terpy and its relatives lack the steric bulk of the two terminal donor sites found in traditional pincer ligands.
“牛逼”用英语怎么说?
当我们要用英语表达"牛逼"这个充满赞誉的词汇时,可以尝试不同的方式,以适应不同的语境和场合。首先,"牛逼"的直接翻译可以写作 "niubility",这是一种源自中文俚语"niubi"的创造,再加上一个名词后缀,如在 "Chinglish is niubility" 中所见,它突显了中式英语的独特魅力。对于外国人来说,表达赞赏...
求一名英文牛逼的人物帮我翻译下!!!
telephone number:1016413797
求个英语牛逼的人翻译一下!!!
翻译结果如下:在化学、 钳配体是一种螯合剂,紧紧地绑定到三个相邻的共面网站,通常是在子午的配置中的过渡金属。[1] 钳金属相互作用的僵硬态度赋予到生成配合物的热稳定性高。这种稳定是部分归因于约束的钳,抑制的每一端的捐助站点有机基取代 cyclometallation 的几何形状。在没有这种效果,cyclomet...
“牛逼”这一词应该怎么用英语译出来?
这个词在中文里就是比较粗俗的称赞;英文里在称赞人的词awesome,great之类前面加上fucking,damn,shitty,bloody,ugly,stinking,freaky之类的词就可以了。
niubility 是什么意思
niubility意思是:“很棒的”,通俗一点就是”牛逼“的意思。该词为音译词,网络词,是网友根据”牛逼“一词音译过来的中国式英语词汇,其中"niubi"即”牛逼,而“lity”为英语中的名词后缀,没什么意思,仅表示名词,表明词性。网友很机智的利用这一点将“牛逼”一次音译为“niubility"。类似的词...
请牛逼人士帮忙翻译下 把英文翻译成中文 谢谢
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英文怎么翻译“牛逼”...先谢谢了
bitchen.老友记里学的.
有个英文单词,翻译大概是天才,,牛逼的意思 bilient,准确翻译(中英 )
brilliant ,绝对是这个。
亲们!谁外贸英语牛逼的!~帮忙翻译五句句子啊!~急那!~是 英翻中 哦!亲...
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牛掰class是什么意思?
牛逼class是一个中国网民常用的网络用语,用来形容事物非常出色、超卓、牛逼、牛鼻等。当一个人或事物处于特别出色的状态时,我们可以用牛逼class来表达。这个口语用语源于英语,中文翻译为牛逼课程,它可以用来褒义也可以用来贬义,但通常是褒义。在中国互联网时代,牛逼class成为了一个普遍的词语,广泛...