diazo

Thân thiện

A chemist carefully handles a diazo compound in the laboratory.

Definition

1. Adjective:
   • Relating to or containing the diazonium group: This is the primary chemical definition. It describes a specific type of organic compound or functional group characterized by two nitrogen atoms bonded together (N₂⁺), one of which is also bonded to a carbon atom in an aromatic ring.
   • Relating to a copying or printing process using diazonium compounds: This definition applies to a historical reprographic technology. It describes processes where light-sensitive diazonium compounds are used to create copies, typically resulting in blue or black lines on a white or yellow background.

Usage Examples

• Adjective (Chemical):
  • The reaction forms a highly reactive diazo intermediate.
  • Diazo compounds are important in the synthesis of dyes and pharmaceuticals.
• Adjective (Reprographic):
  • Before photocopiers were common, engineers used diazo prints, often called blueprints or whiteprints.
  • The architectural drawings were reproduced using a diazo machine.

Advanced Usage

• "Diazo coupling": A fundamental organic reaction where a diazonium salt reacts with another aromatic compound to form an azo compound, which is often brightly colored.
  • The formation of many synthetic dyes involves a diazo coupling reaction.
• "Diazo transfer": A chemical reaction used to introduce a diazo group into a molecule.
  • The reagent is commonly used for diazo transfer to active methylene compounds.

Variants and Related Words

• Diazonium (noun): The specific cation with the formula R−N₂⁺, where R is an organic group. This is the core functional group that the adjective "diazo" refers to.
  • Benzenediazonium chloride is a common diazonium salt.
• Diazoate (noun): A salt or ester of a diazoic acid.
• Diazotization (noun): The chemical process of converting a primary aromatic amine into a diazonium salt.
  • The first step in the synthesis is the diazotization of aniline.

Synonyms

• (For the process) There are no perfect synonyms. The term is highly specific. Related descriptive terms include: diazotype (for the copying process), ammonia process (an older name for one type of diazo printing).

Related Phrases

• "Diazo paper": The light-sensitive paper used in diazo printing.
  • The original drawing was placed on top of the diazo paper and exposed to UV light.
• "Diazo film": A film base coated with a diazonium salt emulsion, used for creating duplicates of technical drawings.

Học thuật

Adjective

1. relating to or containing diazonium