m-PEG4-sulfonic acid

• CAT Number: I016085
• CAS Number: 787524-78-1
• Molecular Formula: C9H20O7S
• Molecular Weight: 272.32
• Purity: ≥95%
• Synonyms: 2-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]ethanesulfonic acid
• InChI: InChI=1S/C9H20O7S/c1-13-2-3-14-4-5-15-6-7-16-8-9-17(10,11)12/h2-9H2,1H3,(H,10,11,12)
• InChIKey: JOLNKYKZGYOWSY-UHFFFAOYSA-N
• SMILES: COCCOCCOCCOCCS(=O)(=O)O

m-PEG4-sulfonic acid（Cat No.:I016085）is a monofunctional methoxy-terminated PEG bearing a terminal sulfonic acid group at the opposite end. The strong, permanently anionic sulfonate imparts high water solubility, low protein adsorption, and robust ionic interactions with cationic surfaces or polymers. The short PEG4 spacer provides compact, flexible spacing while preserving stealth behavior. Useful for tuning zeta potential, electrostatic layer-by-layer assembly, ion-exchange interfaces, and nanoparticle stabilization. Also employed to create acidic microenvironments, proton-conductive domains, or salt pairs with amines without covalent coupling, enabling reversible, pH-stable attachment in biomaterials and surface engineering and coatings.