azo radical
Definition
- Noun:
- The bivalent group -N=N- united to two hydrocarbon groups: In chemistry, an "azo radical" refers specifically to the divalent functional group characterized by two nitrogen atoms double-bonded to each other (-N=N-). This group links two other organic (hydrocarbon) groups, forming part of a larger molecule.
Usage
- The term "azo radical" is a technical term used almost exclusively in the field of organic chemistry. It names the core structural unit found in azo compounds.
- It is typically used in scientific writing, research papers, and textbooks when discussing molecular structure, synthesis, or the properties of dyes and pigments.
Examples
- Noun:
- The vibrant color of the fabric is due to the presence of an azo radical in the dye molecule.
- Chemists study how the stability of the azo radical affects the compound's reactivity.
Advanced Usage
- The "azo radical" itself is not a free radical in the common chemical sense (a species with an unpaired electron). It is a stable connecting unit within a molecule. The name "radical" here is used in an older, more general sense meaning a group of atoms that behaves as a unit in chemical reactions.
- In modern nomenclature, the group is more commonly referred to simply as the "azo group" or "azo linkage."
Variants and Related Words
- Azo group / Azo linkage (n): More common contemporary terms for the -N=N- functional group.
- Azo compound (n): Any organic compound containing the azo group (-N=N-) connecting two aromatic or alkyl groups. Many are used as dyes.
- Diazo (adj): Containing two nitrogen atoms, but typically refers to the -N₂⁺ group (e.g., diazonium salt), which is a precursor for making azo compounds.
Synonyms
- Azo group: The most direct and commonly used synonym in modern chemistry.
- Diazenyl diradical: A very precise and less common synonym emphasizing the divalent nature of the group.
Related Phrases
- Azo coupling: (noun phrase) A specific chemical reaction where a diazonium salt reacts with another aromatic compound to form an azo compound, thus creating the azo radical linkage.
- The dye was synthesized via an azo coupling reaction.
- Azo dye: (noun phrase) A large class of synthetic dyes whose color originates from the azo radical (-N=N-) chromophore.
- Many textile dyes are azo dyes.
Noun
-
the bivalent group -N=N- united to two hydrocarbon groups
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