m-PEG5-NH2

• CAT Number: I014484
• CAS Number: 5498-83-9
• Molecular Formula: C11H25NO5
• Molecular Weight: 251.32
• Purity: ≥95%
• Synonyms: 2-[2-[2-[2-(2-methoxyethoxy)ethoxy]ethoxy]ethoxy]ethanamine
• InChI: InChI=1S/C11H25NO5/c1-13-4-5-15-8-9-17-11-10-16-7-6-14-3-2-12/h2-12H2,1H3
• InChIKey: WGQYVGMCDPUCEJ-UHFFFAOYSA-N
• SMILES: COCCOCCOCCOCCOCCN

m-PEG5-NH2（Cat No.:I014484）is a monofunctional methoxy-polyethylene glycol featuring a terminal primary amine and an inert methoxy cap. The short PEG5 spacer (~220–240 Da) confers aqueous solubility, reduces nonspecific interactions, and provides a compact, flexible linker length for precise spacing. The amine reacts efficiently with NHS esters and activated carboxyls (EDC/NHS), as well as isocyanates, epoxides, and aldehydes via reductive amination, yielding stable amide, urea, or secondary amine bonds. Useful for protein and peptide labeling, nanoparticle and surface modification, and small-molecule conjugation where minimal PEG footprint and accessible amine functionality are desired.