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Related Concept Videos

Qualitative Analysis03:46

Qualitative Analysis

23.5K
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...
23.5K
Common Ion Effect03:24

Common Ion Effect

45.0K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
45.0K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

3.8K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.8K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

4.7K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
4.7K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.2K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.2K
Formation of Complex Ions03:45

Formation of Complex Ions

25.5K
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...
25.5K

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An iron(III) complex salt containing pyrazole as both ligand and counter-ion: bis(1H-pyrazol-2-ium) pentacyanido(1H-pyrazole-κN(2))ferrate(III).

Acta crystallographica. Section C, Structural chemistry·2014
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Bis{tris[(1H-benzimidazol-3-ium-2-yl)methyl]amine} tetraaquaocta-μ₂-chlorido-octachloridopentacadmate(II) monohydrate.

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Related Experiment Video

Updated: Dec 31, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Ammonium imidazolium dichromate.

Run-Qiang Zhu1

  • 1Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 17, 2012
PubMed
Summary
This summary is machine-generated.

The crystal structure of imidazole ammonium dichromate reveals a 3D framework. Hydrogen bonds link imidazole cations, ammonium cations, and dichromate anions in layered arrangements.

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Understanding the structural properties of coordination compounds is crucial for developing new materials.
  • Dichromate salts with organic cations offer unique structural motifs and potential applications.

Purpose of the Study:

  • To elucidate the crystal structure of the title compound, (C(3)H(5)N(2))(NH(4))[Cr(2)O(7)].
  • To investigate the hydrogen bonding interactions and overall structural architecture.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the atomic arrangement.
  • Analysis of hydrogen bonding networks and conformational aspects of the dichromate anion.

Main Results:

  • The crystal structure features a three-dimensional framework formed by N-H⋯O hydrogen bonds.
  • The structure exhibits three distinct types of layers parallel to the (001) plane.
  • The dichromate anion displays an eclipsed conformation with a dihedral angle of 14.65°.

Conclusions:

  • The hydrogen bonding network dictates the formation of a layered 3D structure.
  • The specific arrangement of cations and anions results in unique structural characteristics.
  • The eclipsed conformation of the dichromate anion is a notable feature of this crystal structure.