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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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双基铜 (II) 具有显著动态特性,选择性挥发性有机化合物吸附和交换能力的协调聚合物.

Massimo Cametti1, Martina Lippi2, Meriem Goudjil2

  • 1Politecnico di Milano, Dipartimento di Chimica, Materiali ed Ingegneria Chimica, Via Luigi Mancinelli 7, 20131, Milano, ITALY.

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基于双胺的新型铜协调聚合物表现出动态性质和选择性挥发性有机化合物 (VOC) 吸附. 它们的尺寸性对环境应用的溶剂交换和VOC捕获能力产生重大影响.

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比斯皮丁 * 1D协调聚合物 * 挥发性有机物吸附 * 溶剂交换 * 结构分析

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科学领域:

  • 材料科学 材料科学 材料科学
  • 协调化学 协调化学
  • 纳米技术 纳米技术

背景情况:

  • 比斯皮丁配体为金属离子提供独特的协调环境.
  • 协调聚合物 (CPs) 正在研究它们的动态特性和吸附能力.
  • 控制CP维度对于调整材料性能至关重要.

研究的目的:

  • 为了合成和描述基于双素的Cu (II) 协调聚合物的新型分子.
  • 研究这些CP的动态特性,溶剂交换和VOC吸附.
  • 了解CP维度对其功能行为的影响.

主要方法:

  • 单晶X射线衍射 (SC-XRD) 和粉末X射线衍射 (P-XRD) 用于结构分析.
  • 希尔什菲尔德表面 (HS) 分析和现场可变温度 (VT) XRD用于链际相互作用.
  • 在单晶和微晶样本上进行溶剂交换实验.
  • 挥发性有机化合物 (VOC) 吸附实验在无形脱溶相上进行.

主要成果:

  • 形成1D带状和2D扩展的Cu (II) 协调聚合物框架.
  • 在1D和2DCP中观察到明显的链间相互作用.
  • CP维度对动态行为和溶剂交换的显著影响.
  • 选择性吸附乙二和甲,对甲有很高的亲和力,并通过无形阶段捕获芳香的VOC.

结论:

  • 基于双素的Cu (II) CPs表现出显著的动态特性和选择性的VOC吸附.
  • CP的维度是控制其功能特征的关键因素.
  • 这些材料显示出在VOC捕获技术中的环境和工业应用的潜力.