For research and development scientists and chemists, a thorough understanding of a chemical's identity and properties is the cornerstone of successful formulation and application. Pigment Red 181, identified by its CAS Registry Number 2379-74-0, is a crucial organic pigment within the thioindigo class. Delving into its chemical profile, including molecular structure, key properties, and various synonyms, provides invaluable insights for R&D professionals seeking to leverage its capabilities.

Chemical Identity and Structure

Pigment Red 181 belongs to the thioindigo family of pigments, characterized by the presence of sulfur within its heterocyclic ring system. The molecular formula for Pigment Red 181 is C18H10Cl2O2S2, and its molecular weight is approximately 393.31 g/mol. The presence of chlorine atoms and methyl groups on the benzo[b]thiophene rings contributes to its specific color and stability characteristics.

The IUPAC name often cited for this compound is (2E)-6-chloro-2-(6-chloro-4-methyl-3-oxo-1-benzothiophen-2-ylidene)-4-methyl-1-benzothiophen-3-one. This complex structure, derived from the thioindigo chromophore, is responsible for its intense and stable red color with a yellow undertone.

Key Chemical and Physical Properties

Understanding the properties of Pigment Red 181 is essential for its effective application:

  • Appearance: Typically presented as a red powder.
  • Solubility: It is largely insoluble in water and common organic solvents, which is a key factor in its excellent fastness properties.
  • Heat Stability: Demonstrates good resistance to elevated temperatures, crucial for processing in plastics and certain coating applications.
  • Lightfastness: Exhibits good lightfastness, ensuring durability of color when exposed to UV radiation.
  • Density: Reported densities are around 1.583 g/cm³.
  • Boiling Point: A high boiling point (around 529.1 °C at 760 mmHg) indicates its thermal robustness.

As a supplier of fine chemicals, NINGBO INNO PHARMCHEM CO.,LTD. provides detailed technical specifications for Pigment Red 181 to assist researchers and formulators in their work. We ensure that the products we supply adhere to high purity standards, critical for reproducible R&D outcomes.

Synonyms and Related Information

To aid in literature searches and cross-referencing, Pigment Red 181 is known by several synonyms and related designations:

  • Vat Red 1
  • C.I. 73360
  • D&C Red No.30
  • Oralith Brilliant Pink R
  • Helindone Pink R
  • Permanent Pink
  • 6,6'-Dichloro-4,4'-dimethyl-3H,3'H-[2,2'-bibenzo[b]thiophenylidene]-3,3'-dione

For R&D professionals looking to buy Pigment Red 181, sourcing from a reputable chemical manufacturer like NINGBO INNO PHARMCHEM CO.,LTD. ensures you receive material that meets rigorous quality standards, facilitating your research and development projects.

Conclusion

A deep understanding of the chemical profile of Pigment Red 181 is vital for its effective application in diverse industries. By providing access to accurate CAS numbers, structural information, and essential properties, NINGBO INNO PHARMCHEM CO.,LTD. supports the scientific community in its pursuit of innovation. We invite you to explore our offerings and contact us for your chemical sourcing needs.