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Related Concept Videos

Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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Preparation of 1° Amines: Gabriel Synthesis01:28

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Compact Quantum Dots for Single-molecule Imaging
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Ammonia Synthesis with Visible Light and Quantum Dots.

Vanshika Jain1, Shreya Tyagi1, Pradyut Roy1

  • 1Department of Chemistry, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pune 411 008, India.

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Indium phosphide quantum dots enable efficient, selective ammonia production from nitrate and nitrite using visible light. This sustainable method bypasses the energy-intensive Haber-Bosch process, offering a promising alternative for ammonia synthesis.

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Area of Science:

  • Photocatalysis
  • Green Chemistry
  • Materials Science

Background:

  • The Haber-Bosch process is energy-intensive, driving research into sustainable ammonia synthesis.
  • Current light-assisted ammonia synthesis methods suffer from poor selectivity and reliance on UV light.
  • Nitrate and nitrite are abundant, sustainable nitrogen sources for ammonia production.

Purpose of the Study:

  • To develop a selective visible-light-driven photocatalyst for ammonia production from nitrate and nitrite.
  • To investigate the mechanism and efficiency of indium phosphide quantum dots (InP QDs) in ammonia synthesis.
  • To demonstrate a sustainable alternative to the Haber-Bosch process.

Main Methods:

  • Utilized indium phosphide quantum dots (InP QDs) as photocatalysts.
  • Conducted ammonia synthesis experiments under visible light irradiation.
  • Employed mechanistic investigations and kinetic studies to elucidate the reaction pathway.
  • Analyzed ammonia yield in both aqueous and gaseous phases.

Main Results:

  • Achieved high ammonia yield (∼94%) within 2 hours under visible light.
  • Demonstrated selective ammonia production with negligible hydrogen evolution.
  • Confirmed water as the proton source in the photocatalytic process.
  • Observed ammonia formation under sunlight, indicating practical applicability.

Conclusions:

  • InP QDs are effective photocatalysts for selective, visible-light-driven ammonia synthesis from nitrate and nitrite.
  • The catalyst's design, including indium sites and microenvironment, is crucial for efficiency.
  • This method presents a sustainable and viable alternative to the Haber-Bosch process for ammonia production.