Description

3-[2,4-Bis(Dimethylamino)Phenyl]-4,5,6,7-Tetrachloro-3-[4-(Diethylamino)-o-Tolyl]Phthalide is a specialized, high-value chromogenic compound belonging to the fluoran dye family. Its core value lies in its ability to undergo a distinct and reversible color change, making it a critical functional material for advanced imaging and detection technologies. This compound is essential for manufacturers and R&D teams in the thermal paper, pressure-sensitive materials, and specialty chemical sensing industries seeking reliable, high-performance leuco dyes.

Application

• Thermal Paper & Fax Paper: Primary use as a leuco dye in the color-forming layer, developing color upon exposure to heat from a thermal print head.
• Pressure-Sensitive Recording Materials: Key component in carbonless copy paper (CCP) systems, where color is developed by microencapsulation and pressure-induced rupture.
• Reversible Thermochromic Inks: Formulation of smart inks for temperature indicators, novelty products, and security printing applications.
• Chemical Sensing & Detectors: Development of sensor materials that change color in response to specific chemical stimuli or environmental changes.
• Specialty Coatings & Polymers: Integration into functional coatings for anti-counterfeiting, tamper evidence, and product authentication.
• Research & Development: Serves as a reference standard and key intermediate for synthesizing novel chromogenic and photochromic compounds.

Basic Information

Item	Detail
Product Name	3-[2,4-Bis(Dimethylamino)Phenyl]-4,5,6,7-Tetrachloro-3-[4-(Diethylamino)-o-Tolyl]Phthalide
CAS No.	52941-80-7
Molecular Formula	C33H33Cl4N3O2
Molecular Weight	645.45 g/mol
Synonyms	ODB-4; 4,5,6,7-Tetrachloro-3-[4-(diethylamino)-2-methylphenyl]-3-[2,4-bis(dimethylamino)phenyl]phthalide; 3-[2,4-Bis(dimethylamino)phenyl]-3-[4-(diethylamino)-2-methylphenyl]-4,5,6,7-tetrachlorophthalide; ODB-4 Leuco Dye; Black 4 Leuco Dye; 2'-Methyl-4'-(diethylamino)-2-[2,4-bis(dimethylamino)phenyl]-4,5,6,7-tetrachlorophthalide; 4,5,6,7-Tetrachloro-3,3-bis[4-(diethylamino)-o-tolyl]phthalide (related structure)
EINECS	Contact for details

Quality Control

Our production of this high-purity leuco dye adheres to strict quality management protocols to ensure batch-to-batch consistency and performance reliability. Every lot is characterized using advanced analytical techniques including HPLC for purity, spectrophotometry for color value, and IR for structural confirmation. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with each shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This material is light-sensitive; prolonged exposure to light should be avoided to prevent degradation of its chromogenic properties. Keep away from strong oxidizing agents and incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light yellow crystalline powder
Identification (IR)	Conforms to reference spectrum
Purity (HPLC)	≥ 98.0%
Melting Point	Contact for details
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.