Blue SRB

1.Basic Information
CAS Number: 67707-04-4
English name: 4,4′-[(9-butyl-9H-carbazol-3-yl)methylene]bis[N-methyl-N-phenylaniline]
Molecular formula: C₄₃H₄₁N₃
Molecular weight: Approximately 599.8 g/mol
EINECS Number: 266-957-3

2.Physical and chemical properties
Appearance: Industrial products are usually light yellow to blue fine powders. Different suppliers have different purities and applications, resulting in slight variations in appearance descriptions (such as light yellow powder or blue powder).
Solubility: Insoluble in water, but soluble in organic solvents (such as chloroform, dichloromethane, toluene, etc.).
Melting point: Approximately 67 – 71.2°C.
Stability: It is usually stable at normal temperature and pressure and is mainly used in specific reaction environments.

3.Main application
The core application of this product is focused on the field of functional materials, rather than ordinary dyes:
Thermosensitive material (core application): This compound is a crucial blue colorant in the production of thermal paper. In the thermal coating, it acts as a precursor for a colorless dye and undergoes a chemical reaction upon heating, resulting in a blue color. This is one of its most widespread applications.
Electronic and optical materials: Due to the presence of carbazole groups and triphenylene structures in its molecular structure, it exhibits excellent hole transport ability and electronic properties, and has been studied for use in advanced material science fields such as organic light-emitting diodes (OLED) and electrochromic devices.

4.Safety and Storage
Hazardousness: Although there is a lack of detailed GHS hazard classification data, as a fine chemical intermediate, standard laboratory safety protocols should be followed during operation, and protective gloves and goggles should be worn.
Storage conditions: It should be stored in a sealed container in a cool, dry, well-ventilated place, and kept away from strong oxidants.

Product Manager Email: Lucy@coreychem.com