Oligoethylene glycols are versatile hydrophilic linkers. Each monomer has a length of 3.43 Å, so that the length of PEG4 is around 14 Å (1.4 nm).
Azide-PEG4-Amine is a bifunctional compound with an amine group that can be modified by acylation by activated esters or similar carbonyl compounds, and an azide group that is suitable for Click chemistry reactions. PEG4 is highly hydrophilic and biocompatible.
Coumarin 343 is a blue emitting fluorophore that can serve as a FRET donor for fluorescein (FAM). This azide derivative can be conjugated with alkynes by Click chemistry. An extended linker arm between the fluorophore and the azide group enhances solubility, and provides spatial separation between the dye and the biomolecule.
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