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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...

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Generation of Scalable, Metallic High-Aspect Ratio Nanocomposites in a Biological Liquid Medium
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Aqueous copper sulfide clusters as intermediates during copper sulfide formation.

George W Luther1, Stephen M Theberge, Tim F Rozan

  • 1College of Marine Studies, University of Delaware, Lewes 19958, USA. luther@udel.edu

Environmental Science & Technology
|March 2, 2002
PubMed
Summary

Copper(II) reduction to Copper(I) by sulfide happens in solution before precipitation. Copper-sulfide bonds form first, followed by electron transfer, leading to covellite (CuS) formation.

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Area of Science:

  • Geochemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Copper sulfide (CuS) precipitation is crucial in geochemistry and materials science.
  • Understanding the reaction mechanism of CuS formation is essential for controlling its properties.

Purpose of the Study:

  • To elucidate the mechanism of copper sulfide precipitation.
  • To determine the sequence of copper reduction and bond formation during CuS synthesis.

Main Methods:

  • Electron Paramagnetic Resonance (EPR) spectroscopy
  • 63Cu Nuclear Magnetic Resonance (NMR) spectroscopy
  • Mass spectrometry
  • Computational analysis of molecular orbitals

Main Results:

  • Copper(II) reduction to Copper(I) occurs in solution before CuS precipitation.
  • Copper-sulfide bonds and molecular clusters (e.g., Cu3S3 rings) form prior to electron transfer.
  • Covellite (CuS) mineral contains only Cu(I).
  • Outer-sphere electron transfer is symmetry forbidden, suggesting an inner-sphere mechanism.

Conclusions:

  • CuS formation involves initial Cu-S bond formation and cluster assembly in solution.
  • Copper reduction is a subsequent step, occurring after the formation of higher-order Cu-S structures.
  • The findings clarify the precipitation pathway of copper sulfide, impacting fields from geochemistry to materials science.