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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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Preparation and Reactions of Thiols02:33

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Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones01:24

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones

5.5K
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.1K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.1K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

47.5K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Atomic-level separation of thiolate-protected metal clusters.

Yuichi Negishi1, Sayaka Hashimoto, Ayano Ebina

  • 1Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan. negishi@rs.tus.ac.jp.

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High-resolution separation techniques like PAGE, HPLC, and TLC are crucial for isolating and understanding thiolate-protected gold clusters. These methods enable detailed analysis of cluster properties and reaction processes.

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Area of Science:

  • * Nanomaterials Science
  • * Analytical Chemistry
  • * Physical Chemistry

Background:

  • * Fine metal clusters exhibit unique properties distinct from bulk metals.
  • * Thiolate-protected gold clusters (Aun(SR)m) are widely studied due to synthesis ease.
  • * Early 2000s faced challenges in isolating these clusters, necessitating advanced separation methods.

Purpose of the Study:

  • * To review high-resolution separation techniques for gold clusters.
  • * To highlight the role of PAGE, HPLC, and TLC in cluster research.
  • * To promote understanding of separation method utility and features.

Main Methods:

  • * Polyacrylamide gel electrophoresis (PAGE)
  • * High-performance liquid chromatography (HPLC)
  • * Thin-layer chromatography (TLC)

Main Results:

  • * Established atomic-level separation methods enabled isolation of Aun(SR)m clusters.
  • * Enabled understanding of the relationship between chemical composition and cluster properties (stability, electronic, physical).
  • * These techniques are vital for product distribution evaluation and reaction monitoring.

Conclusions:

  • * High-resolution separation techniques are essential for advancing the study of Aun(SR)m clusters.
  • * PAGE, HPLC, and TLC offer high resolution and repeatability.
  • * This review consolidates knowledge on these separation methods for gold clusters.