An elegant room temperature procedure for the precise control of composition in the Cu-S system
1Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India.
Inorganic Chemistry
|August 27, 2011
Abstract:
A general methodology for the precise control of the final product composition in the copper sulfide system has been established for the first time. Cu(2)S, prepared by the dissociation of [Cu(tu)(3)]Cl in ethylenediamine, was subjected to controlled chemical oxidation by iodine to obtain Cu(2-x) (x = 0.2, 0.25, 0.88, 1.0) at room temperature. The compositions were characterized by powder X-ray diffraction, ICP spectroscopy, Raman spectroscopy, and magnetization measurements.
Related Concept Videos
01:27Controlled-Current Coulometry: Overview
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
01:18Controlled-Current Coulometry: Coulometric Titration
Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
01:17Precipitation 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...