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Related Concept Videos

Qualitative Analysis03:46

Qualitative Analysis

21.9K
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...
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α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

2.1K
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
2.1K
Halogenation of Alkenes02:46

Halogenation of Alkenes

17.1K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
17.1K
Formation of Halohydrin from Alkenes02:41

Formation of Halohydrin from Alkenes

12.6K
An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
12.6K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

1.9K
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.
1.9K
Common Ion Effect03:24

Common Ion Effect

34.1K
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:
34.1K

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Related Experiment Video

Updated: Apr 30, 2026

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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8.9K

Propane-1,2-di-ammonium chromate(VI).

Sonia Trabelsi1, Manel Essid1, Thierry Roisnel2

  • 1Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna Bizerte, Tunisia.

Acta Crystallographica. Section E, Structure Reports Online
|April 26, 2014
PubMed
Summary

This study reveals how propane-1,2-di-ammonium cations form hydrogen bonds with chromate anions in a molecular salt. These interactions create a layered crystal structure with a unique three-dimensional network.

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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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:

  • Crystallography
  • Supramolecular Chemistry
  • Inorganic Chemistry

Background:

  • Molecular salts offer unique structures for studying intermolecular interactions.
  • Hydrogen bonding plays a crucial role in crystal engineering and material properties.

Purpose of the Study:

  • To investigate the hydrogen bonding interactions within the molecular salt (C3H12N2)[CrO4].
  • To elucidate the crystal structure and network formation driven by these interactions.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the molecular and crystal structure.
  • Analysis of hydrogen bond donors (N-H, C-H) and acceptors (O atoms) within the chromate anion.

Main Results:

  • The chromate anion accepts six hydrogen bonds (N-H⋯O and C-H⋯O) from propane-1,2-di-ammonium cations.
  • Three oxygen atoms of the chromate anion are involved in hydrogen bonding, with one Cr-O bond being shorter.
  • Anions and cations form layered stacks parallel to the (100) plane, resulting in a 3D network.

Conclusions:

  • The observed hydrogen bonding pattern dictates the crystal packing and formation of a 3D network in (C3H12N2)[CrO4].
  • The asymmetry in chromate anion bonding influences its structural characteristics within the crystal lattice.