Description

1H-Benzimidazole-5,7-Disulfonic Acid, 2,2'-(1,4-Phenylene)Bis-, Sodium Salt (1:) is a high-purity, water-soluble organic intermediate featuring a bis-benzimidazole core linked by a phenylene bridge. This compound is valued for its strong chromophoric properties and ability to form stable complexes, making it a critical building block for advanced functional materials. It is primarily sought by manufacturers in the specialty chemical, dye, and pharmaceutical industries for research and production applications. The product is supplied with a Certificate of Analysis to ensure batch-to-batch consistency and reliability.

Application

• Optical Brightening Agents (OBAs): A key intermediate in the synthesis of high-performance fluorescent whitening agents for paper, textiles, and detergents.
• Functional Dyes & Pigments: Used in the production of specialized dyes for LCD color filters, ink-jet inks, and security printing due to its sulfonated, water-soluble structure.
• Pharmaceutical Intermediates: Serves as a sophisticated precursor in the research and development of novel active pharmaceutical ingredients (APIs), particularly those targeting specific biological receptors.
• Metal Ion Sensors & Chelators: Employed in analytical chemistry and environmental testing kits to detect and chelate specific metal ions, leveraging its complexing ability.
• Polymer Additives: Incorporated into specialty polymers to impart UV-stabilizing or specific optical properties to the final material.
• Research & Development: A valuable compound for academic and industrial R&D in organic synthesis, materials science, and photochemistry.

Basic Information

Product Name	1H-Benzimidazole-5,7-Disulfonic Acid, 2,2'-(1,4-Phenylene)Bis-, Sodium Salt (1:)
CAS No.	226952-42-7
Molecular Formula	C26H14N4Na2O12S4
Molecular Weight	764.64 g/mol
Synonyms	2,2'-(1,4-Phenylene)bis(1H-benzimidazole)-5,7-disulfonic acid disodium salt; Disodium 2,2'-(1,4-phenylene)bis(1H-benzimidazole-5,7-disulfonate); Phenylene Bis-benzimidazole Disulfonate Sodium Salt; PBS Disodium Salt; Optical Brightener Intermediate 226952-42-7; 4,4'-Bis(benzimidazolyl)biphenyl-2,2'-disulfonic acid disodium salt (related isomer); EINECS Contact for details

Quality Control

Our 1H-Benzimidazole-5,7-Disulfonic Acid, 2,2'-(1,4-Phenylene)Bis-, Sodium Salt (1:) is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for identity, purity, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, impurity profile, and physical characteristics are provided to guarantee traceability and compliance with your project requirements.

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 product is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent degradation. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to brownish-yellow powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Residue on Ignition (Sulfated Ash)	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Total impurities ≤ 5.0%
Solubility (1% in Water)	Clear, yellow solution

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