Description

4-Carboxyphenylphosphonic Acid is a versatile bifunctional organic compound containing both carboxylic acid and phosphonic acid groups. This unique structure makes it a valuable building block and surface modifier in advanced material science and nanotechnology. It is essential for researchers and manufacturers in the electronics, pharmaceutical, and specialty chemical sectors seeking to engineer specific surface properties or create novel molecular architectures.

Application

• Surface Modification & Self-Assembled Monolayers (SAMs): Widely used to functionalize metal oxide surfaces (e.g., ITO, TiO2, ZnO) for improved adhesion, wettability control, and interface engineering in electronic devices.
• Pharmaceutical Intermediates: Serves as a key precursor in the synthesis of bioactive molecules, including bisphosphonate drugs for treating bone disorders.
• Metal-Organic Frameworks (MOFs): Acts as a linker molecule in the construction of porous MOF materials for gas storage, separation, and catalysis.
• Corrosion Inhibition: Applied as an effective corrosion inhibitor for metals due to the strong chelating ability of the phosphonic acid group.
• Dental & Biomedical Materials: Used in formulations for dental cements and bone graft materials to enhance bonding to mineralized tissues.
• Sensor Development: Functionalizes sensor surfaces to improve selectivity and sensitivity for detecting specific analytes.
• Catalysis: Employed as a ligand or catalyst component in various organic synthesis and polymerization reactions.
• Nanoparticle Stabilization: Coats nanoparticles to prevent aggregation and provide functional groups for further conjugation.

Basic Information

Product Name	4-Carboxyphenylphosphonic Acid
CAS No.	618-21-3
Molecular Formula	C7H7O5P
Molecular Weight	202.10 g/mol
Synonyms	(4-Carboxyphenyl)phosphonic Acid; 4-Phosphonobenzoic Acid; p-Carboxyphenylphosphonic Acid; Benzoic acid, 4-phosphono-; p-Phosphonobenzoic Acid; Phenylphosphonic acid-4-carboxylic acid; 4-(Dihydroxyphosphoryl)benzoic Acid; [4-(Phosphono)benzoic] Acid
EINECS	210-548-6

Quality Control

Our 4-Carboxyphenylphosphonic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and NMR for structural confirmation, to ensure it meets the high standards required for research and industrial applications. A detailed Certificate of Analysis (COA) is provided with every shipment, and we support compliance with global regulatory frameworks such as REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; therefore, containers must be kept tightly sealed and away from direct light to maintain stability and purity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 2.0%
Melting Point	Contact for details
Heavy Metals	< 20 ppm

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