Carboxy-PEG4-phosphonic acid

• CAT Number: I016521
• CAS Number: 1623791-69-4
• Molecular Formula: C11H23O9P
• Molecular Weight: 330.27
• Purity: ≥95%
• Synonyms: 3-[2-[2-[2-(2-phosphonoethoxy)ethoxy]ethoxy]ethoxy]propanoic acid
• InChI: InChI=1S/C11H23O9P/c12-11(13)1-2-17-3-4-18-5-6-19-7-8-20-9-10-21(14,15)16/h1-10H2,(H,12,13)(H2,14,15,16)
• InChIKey: HQKHMGCGBQVUTI-UHFFFAOYSA-N
• SMILES: C(COCCOCCOCCOCCP(=O)(O)O)C(=O)O

Carboxy-PEG4-phosphonic acid(CAT: I016521) is a bifunctional polyethylene glycol linker featuring a terminal carboxyl group and a phosphonic acid moiety connected through a four-unit PEG spacer. The PEG4 chain provides enhanced solubility, flexibility, and minimized steric interference, making it well-suited for bioconjugation and material surface modification. The carboxyl group allows coupling to amines or other reactive species, while the phosphonic acid ensures strong and stable binding to metal oxides such as titanium or zirconium. This dual functionality makes Carboxy-PEG4-phosphonic acid highly useful in biomedical research, nanotechnology, and biomaterial coatings where durable immobilization and hydrophilic surface properties are required.