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首页> 外文期刊>New Journal of Chemistry >Complexation and transport of alkali,alkaline earth,transition and heavy metal cations by p-tert-butyldihomooxacalix[4]arene tetra(diethyl)amide
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Complexation and transport of alkali,alkaline earth,transition and heavy metal cations by p-tert-butyldihomooxacalix[4]arene tetra(diethyl)amide

机译：对叔丁基二高恶唑基[4]芳烃四（二乙基）酰胺对碱金属，碱土金属，过渡金属和重金属阳离子的络合和迁移

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摘要

The binding properties of the tetra(diethyl)amide (2) derived from p-rerr-butyldiriomooxacalix[4]arene,in the cone conformation,towards alkali,alkaline earth,transition (Mn~(2+),Fe~(2+),Co~(2+),Ni~(2+),Cu~(2+) and Zn~(2+)) and heavy (Ag~+,Cd~(2+),Hg~(2+) and Pb~(2+)) metal cations have been established by extraction studies of metal picrates from an aqueous solution into dichloromethane,transport experiments with the same salts through a dichloromethane membrane and stability constant measurements in methanol.Results concerning the calorimetric study of Na~+ and K~+ complexes in methanol are presented.The affinity of 2 for some cations (Na~+,K~+,Ba~(2+),Ag~+ and Zn~(2+)) has been investigated by ~1H NMR spectrometry,as well.The results are compared to those obtained with the analogous calix[4]arene tetraamide derivative 3.Amide 2 displays a preference for the alkali cations (mainly Na~+ and K~+) in contrast to amide 3 that prefers the alkaline earth cations.Ag~+ and Cd~(2+) soft Lewis acids are also strongly bound by both amides.~1H NMR titrations confirm the formation of 1:1 complexes between 2 and all cations studied,also suggesting that they should be located inside the cavity defined by the phenoxy and carbonyl oxygen atoms.2 shows transport rates that do not follow the same trends as the stability constants or extraction percentages;it can therefore be characterized as a selective receptor.
机译：对-叔丁基二茂氧杂lix [4]芳烃衍生的四（二乙基）酰胺（2）在锥构象中向碱，碱土，过渡（Mn〜（2 +），Fe〜（2+ ），Co〜（2 +），Ni〜（2 +），Cu〜（2+）和Zn〜（2+））和重金属（Ag〜+，Cd〜（2 +），Hg〜（2+）通过从水溶液中将金属苦味酸盐萃取到二氯甲烷中，将相同的盐类通过二氯甲烷膜进行迁移实验以及在甲醇中的稳定性常数进行测量，已建立了Pb〜（2+）和Pb〜（2+））金属阳离子。给出了甲醇中的〜+和K〜+配合物。研究了2对某些阳离子（Na〜+，K〜+，Ba〜（2 +），Ag〜+和Zn〜（2+））的亲和力。 〜1H NMR光谱。将结果与类似杯[4]亚芳基四酰胺衍生物3得到的结果进行比较。酰胺2与酰胺相比，对碱金属阳离子（主要是Na〜+和K〜+）表现出偏爱。 3更喜欢碱土金属阳离子。Ag〜+和Cd〜（2+）软路易斯〜1H NMR滴定证实2和所有研究的阳离子之间形成1：1络合物，也表明它们应位于由苯氧基和羰基氧原子限定的腔内。2显示出转运速率不遵循与稳定性常数或提取百分比相同的趋势;因此可以将其表征为选择性受体。

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