2,2′-Biquinoline
2,2′-Biquinoline (CAS 119-91-5), with the molecular formula C18H12N2 and a molecular weight of 256.30, is a heterocyclic organic compound. It is recognized for its chelating properties, particularly its ability to form stable complexes with copper(I) ions. This characteristic makes it valuable in analytical chemistry and as a building block in organic synthesis, especially for constructing more complex heterocyclic systems and ligands.
- IUPAC
- 2,2′-Diquinolyl,Cuproin
- Synonyms
- 2,2′-DiquinolylCuproin

Analytical Reagent
2,2′-Biquinoline is widely employed as a sensitive colorimetric reagent for the determination of copper, forming a characteristic purple complex with Cu(I).
Ligand Synthesis
It serves as a precursor or component in the synthesis of bidentate nitrogen ligands for coordination chemistry, finding use in catalysis and materials science.
Organic Synthesis
As a quinoline derivative, it is utilized as a building block in the construction of complex organic molecules and functional materials.
| Molecular weight | 256.30 |
|---|---|
| Empirical formula | C18H12N2 |
| Assay | 98% |
| Melting point | 192-195 °C(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 2,2′-Biquinoline used for?
+
2,2′-Biquinoline is primarily used as an analytical reagent for copper determination and as a building block in organic synthesis and ligand development.
What are the CAS number and formula for 2,2′-Biquinoline?
+
The CAS number for 2,2′-Biquinoline is 119-91-5, and its empirical formula is C18H12N2.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 2,2′-Biquinoline with a minimum assay of 98%. This product is intended for research and laboratory use and is not represented as USP, BP, or EP grade.
What are the safety precautions for handling 2,2′-Biquinoline?
+
Handle 2,2′-Biquinoline with appropriate personal protective equipment, including a dust mask (type N95 or equivalent), eyeshields, and gloves. Avoid inhalation of dust and ensure adequate ventilation, as it may cause respiratory irritation (H335), skin irritation (H315), and serious eye irritation (H319).
How is 2,2′-Biquinoline shipped?
+
Tech Serve Solutions exports and supplies 2,2′-Biquinoline under strict quality control and safety protocols, ensuring reliable global delivery.
How can I request a sample or quote?
+
To request a sample or obtain a quote for 2,2′-Biquinoline, please contact our sales department via the website or designated contact channels.
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis