Understanding the chemical composition and properties of pigments is fundamental for chemists, formulators, and procurement managers in the B2B sector. Pigment Red 48:1 (CAS 7585-41-3), a prominent organic pigment, offers a fascinating case study in color chemistry. As a reputable chemical supplier, we aim to demystify its science to help you make informed purchasing decisions.

Molecular Structure and Synthesis

Pigment Red 48:1 belongs to the class of monoazo pigments, specifically a barium salt lake. Its chemical name is Barium 4-[(5-chloro-4-methyl-2-sulphonatophenyl)azo]-3-hydroxy-2-naphthoate. The core structure involves an azo linkage (-N=N-) connecting two aromatic systems, derived from the diazotization of an aromatic amine and coupling with a naphthol derivative. The presence of a sulfonic acid group on one aromatic ring and its subsequent salt formation with barium ions contribute to its insolubility and stability, characteristic of lake pigments.

The synthesis typically involves several steps: sulfonating and chlorinating an aromatic precursor, followed by diazotization. This diazonium salt is then coupled with a naphthol derivative to form the azo dye. Finally, precipitation with a barium salt creates the insoluble Pigment Red 48:1. The specific reaction conditions and post-treatment steps, which we meticulously control as a manufacturer, influence the pigment's particle size, shape, and ultimately its performance properties like hue, tinting strength, and fastness.

Key Chemical Properties and Their Impact

The chemical structure of Pigment Red 48:1 dictates its physical and performance characteristics:

  • Azo Chromophore: The extended conjugated system of the azo group and aromatic rings is responsible for absorbing visible light and imparting the characteristic red color.
  • Sulfonate Group and Barium Salt: The ionic nature of the barium salt makes the pigment insoluble in water and most organic solvents, which is crucial for its application in inks and plastics where it needs to remain dispersed and stable.
  • Substituents (Chloro, Methyl): These groups on the aromatic rings influence the electronic structure, subtly shifting the absorption spectrum and thus the perceived hue, contributing to its yellowish-red shade.
  • Resistance Profiles: The stability of the azo linkage and the overall molecular structure determine its resistance to heat, light, and chemicals. While it offers good solvent resistance due to insolubility, the azo linkage can be susceptible to degradation under strong acidic or alkaline conditions or prolonged UV exposure, which explains its limited alkali/acid resistance and moderate lightfastness.

Procuring Chemically Sound Pigments

When you buy Pigment Red 48:1 from a trusted manufacturer, you are assured of a product whose synthesis has been optimized for specific industrial requirements. We provide detailed chemical information and technical support to ensure you can effectively incorporate our Pigment Red 48:1 into your formulations. Understanding the chemistry behind the color helps you anticipate performance and make informed choices.

We invite you to explore the quality and consistency of our Pigment Red 48:1. Contact us for detailed specifications, safety data, and competitive pricing. Our commitment to chemical integrity ensures you receive a pigment that performs reliably in your applications.