Overview
Phenazine is a tricyclic aromatic compound consisting of two benzene rings fused to a pyrazine ring. First synthesized in the 19th century, it has become an important scaffold in medicinal chemistry and material science. Industrial production typically involves the Skraup synthesis or oxidative coupling of anilines. Its planar structure and electron-deficient nature make it valuable for creating derivatives with tailored properties.
Physical and Chemical Properties
Phenazine exhibits high thermal stability with a sublimation point of 360°C. The crystalline powder shows weak fluorescence and forms stable radical anions under reduction. Its UV-Vis spectrum shows characteristic absorption at 365 nm (ε ≈ 5,000 M−1cm−1). The compound undergoes electrophilic substitution at positions 1 and 4, while nucleophilic attacks preferentially occur at positions 2 and 7.
Main Applications
Approximately 60% of phenazine production is used to synthesize dyes like Neutral Red and Safranin T for textile and biological staining. In agriculture, phenazine-1-carboxylic acid derivatives serve as biocontrol agents against soil-borne pathogens. The electronics industry utilizes phenazine derivatives as n-type semiconductors in organic photovoltaics. Recent research explores their use in redox flow batteries due to reversible two-electron transfer properties.
Safety and Storage
Phenazine is classified as Harmful (Xi) under EU regulations. Dust control measures and PPE (gloves, goggles) are mandatory during handling. Spills should be contained with inert absorbents. Long-term storage requires nitrogen-blanketed containers to prevent oxidation. Incompatible with strong acids, bases, and oxidizing agents. Shelf life typically exceeds 3 years when stored below 30°C.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-specific COAs. Technical grade (≥95%) suffices for dye production, while pharmaceutical applications require ≥99.5% purity. Bulk shipments often use fiber drums with polyethylene liners. Just-in-time procurement is recommended due to limited shelf life after container opening. Major production regions include China, India, and Germany.
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