Chemical Identity and Properties

3-(2-Pyridyl)aniline (Aladdin SKU: A697789) is an aromatic heterocyclic compound in which a pyridin-2-yl group is attached at the meta position of an aniline ring. The molecule presents two key nitrogen-containing moieties: a primary amine on the phenyl ring and an sp²-hybridized pyridine nitrogen. This combination confers amphoteric character — the aniline nitrogen is a weak base and nucleophile, while the pyridine nitrogen is a stronger Lewis-basic coordination site.

The compound is typically a pale-yellow to off-white crystalline solid or low-melting solid at room temperature. It is soluble in common organic solvents such as ethanol, methanol, dichloromethane, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO), and shows limited solubility in water. Researchers should consult the product Certificate of Analysis (CoA) for lot-specific purity, melting point, and spectral data.

Storage and Stability Guidelines

To preserve the integrity of 3-(2-Pyridyl)aniline, adhere to the following storage guidelines:

• Temperature: Store in a cool, dry location. A refrigerated environment (2–8 °C) is generally recommended for long-term stability. Verify exact conditions on the product label and CoA.
• Atmosphere: Primary aromatic amines can be sensitive to prolonged air and light exposure, potentially undergoing oxidation or discoloration. Store under an inert atmosphere (nitrogen or argon) or in tightly sealed amber vials when possible.
• Moisture: Keep the container tightly closed and away from moisture. Desiccants may be used in the storage container.
• Segregation: Store away from strong oxidizing agents, strong acids, and reactive electrophiles that could react with the free amine group.
• Shelf Life: Follow the expiration date indicated on the label. Inspect the material for discoloration before use and re-confirm purity by analytical methods (e.g., HPLC, NMR) if stored for extended periods.

Safe Handling and Laboratory Precautions

As an aromatic amine, 3-(2-Pyridyl)aniline should be handled with appropriate care. Aromatic amines as a chemical class have documented health-hazard potential; however, specific toxicological data for this compound should be confirmed in the current Safety Data Sheet (SDS) available from Aladdin Scientific.

• Personal Protective Equipment (PPE): Wear chemically resistant gloves (e.g., nitrile), a laboratory coat, and safety goggles. Use a fume hood when weighing or handling the compound in open containers.
• Inhalation: Avoid breathing dust or vapors. Ensure adequate local exhaust ventilation.
• Skin/Eye Contact: Avoid direct contact. In case of skin or eye exposure, rinse immediately with copious amounts of water and seek medical attention as appropriate.
• Ingestion: Not for human or veterinary use. Do not eat, drink, or smoke in areas where this compound is handled.
• Waste Disposal: Dispose of waste material in accordance with local, regional, and national regulations governing aromatic amine-containing chemical waste.

Always consult the current SDS before working with this reagent.

Research Applications and Reaction Protocols

3-(2-Pyridyl)aniline is valued in synthetic and materials chemistry for its chelating and reactive amine functionality. Key application areas include:

Ligand and Coordination Chemistry

The compound acts as a bidentate or bridging ligand precursor. The pyridine nitrogen and aniline nitrogen can coordinate to transition metals (e.g., Cu, Pd, Fe, Ru), forming stable chelate complexes. Such complexes are studied for catalysis, sensing, and luminescent materials.

Pharmaceutical and Medicinal Chemistry Intermediates

The free amine group enables derivatization via acylation, sulfonylation, reductive amination, and condensation with carbonyl compounds, providing access to amide, sulfonamide, imine/Schiff base, and urea derivatives. These scaffolds are relevant in drug discovery targeting diverse biological pathways.

Schiff Base and Imine Formation

Reaction with aldehydes or ketones under mild conditions yields Schiff base products with extended conjugation, relevant for fluorescent probes, sensors, and biologically active compounds.

Coupling Reactions

As an aniline derivative, it can participate in palladium-catalyzed cross-coupling reactions (e.g., Buchwald-Hartwig amination) and diazotization-based transformations to introduce further structural diversity.

Optimize reaction conditions (solvent, temperature, equivalents, catalyst loading) empirically; the specific protocols will depend on the target molecule and reaction type.

Quality Verification and Analytical Characterization

Before use in sensitive applications, verify the identity and purity of A697789 using the following recommended analytical methods:

• ¹H and ¹³C NMR Spectroscopy: Confirm the aromatic proton pattern consistent with a meta-substituted aniline and 2-substituted pyridine. The NH₂ protons typically appear as a broad singlet; their chemical shift is solvent-dependent.
• High-Performance Liquid Chromatography (HPLC): Use a reverse-phase C18 column to quantify purity. The compound's UV absorbance (aromatic chromophore) facilitates detection at 254 nm or the absorption maximum determined by UV-Vis.
• Mass Spectrometry (MS): Confirm the molecular ion at the expected m/z consistent with C₁₁H₁₀N₂ (MW ≈ 170.21 g/mol). ESI-MS in positive mode typically gives [M+H]⁺.
• Infrared Spectroscopy (IR): Look for characteristic N–H stretching bands (~3300–3450 cm⁻¹) and aromatic C=N, C=C stretching bands in the fingerprint region.
• Melting Point: Compare against the value on the CoA as a rapid purity indicator.

Record and retain all analytical data for traceability and compliance with good laboratory practice (GLP) requirements.