Alkaline Red 1:1 is a cationic basic fluorescent dye belonging to the oxadiazine class. It is often used as a specific chloride variant of Rhodamine 6G for dyeing and the preparation of advanced pigments.

Product Name: Basic Red 1:1

CAS Number: 3068-39-1

Chemical name: 3,6-Di(ethylamino)-9-[2-(methoxycarbonyl)phenyl]-2,7-Dimethyl Chloroxanthone (3,6-bis(ethylamino)-9-[2-(methoxycarbonyl)phenyl]-2,7-dimethylxanthylium chloride)

Molecular formula: C₂₇H₂₉ClN₂O₃

Molecular weight: Approximately 464.98 - 464.99 grams per mole.

EINECS number: 221-326-1.

Color Index Number: C.I. 45161

Physical and chemical parameters

• Appearance and properties: Usually appears as red powder, or described as bright red crystals, or reddish-brown to dark purple powder.

• Purity: The content of the common grade is ≥ 90.0%.

• Melting point / Boiling point: The boiling point is approximately 593.8 ºC (760 mmHg), and the flash point is approximately 312.9 ºC.

• Solubility: At 20℃, the solubility in water is 18.9g/L. It is highly soluble in water and turns deep red when dissolved in ethanol.

• Spectral characteristics: The maximum absorption wavelength (λmax) is approximately 525 nm (in aqueous solution).

• LogP value: 1.7 (at 20℃), indicating a certain degree of hydrophilicity.

• Storage conditions: It is recommended to store at 2-8°C in a sealed container, protected from light and moisture.

Advantages and Characteristics

• Fluorescence properties: As a derivative of the rhodamine family, this dye exhibits strong fluorescence properties with vivid color.

• Dissolving performance: Good solubility in water and alcohol-based solvents, facilitating formulation and usage.

• Stability: Under the recommended storage conditions, the chemical properties remain stable. It is necessary to avoid contact with strong oxidants.

• Distinguishability: The structure corresponding to this CAS number is mainly in the form of methyl ester, which differs from the common rhodamine 6G (CAS 989-38-8, mostly in the form of ethyl ester) in the ester group structure.

Main purpose

• Biological staining: Used for preparing biological staining solutions, such as the Wright-Giemsa Stain, which is suitable for staining and observing biological tissue sections or blood smears.

• Fine chemicals: Used as components in the production of high-quality inks, pigments and coatings.

• Research experiment: As laboratory biochemical reagents, they are used for scientific research or for analysis and detection methods such as high-performance liquid chromatography (HPLC).

• Laser dye: Due to its excellent optical properties, it is also known as rhodamine 590 chloride and can be used as a laser dye medium.

Safety and Storage

• Safety instructions: It is recommended to wear appropriate protective clothing and gloves during operation. Avoid inhaling dust.

• Storage method: Store in a sealed container at room temperature (RT), and keep in a cool, dry, and well-ventilated place.