m-PEG9-SH

• CAT Number: I016295
• CAS Number: 651042-84-1
• Molecular Formula: C19H40O9S
• Molecular Weight: 444.58
• Purity: ≥95%
• Synonyms: 2-[2-[2-[2-[2-[2-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanethiol
• InChI: InChI=1S/C19H40O9S/c1-20-2-3-21-4-5-22-6-7-23-8-9-24-10-11-25-12-13-26-14-15-27-16-17-28-18-19-29/h29H,2-19H2,1H3
• InChIKey: CDNIDSBAWGKXHY-UHFFFAOYSA-N
• SMILES: COCCOCCOCCOCCOCCOCCOCCOCCOCCS

m-PEG9-SH(CAT: I016295) is a monofunctional polyethylene glycol (PEG) derivative bearing a methoxy group at one end and a thiol group at the other. The PEG9 chain, composed of nine ethylene glycol units, provides flexibility, hydrophilicity, and excellent solubility in both aqueous and organic media. The thiol functionality allows site-specific conjugation with maleimide, haloacetyl, or gold-surface groups through stable thioether or thiolate bonds, while the methoxy terminus provides stability and minimizes non-specific interactions. This reagent is widely applied in bioconjugation, nanomaterial functionalization, surface modification, and drug delivery systems where a medium-length, thiol-reactive PEG spacer is required.