Alkyne-PEG3-iodide | CAS 1234387-35-9

Alkyne-PEG3-iodide is a PEG-based alkynyl functionalization reagent featuring a terminal alkyne handle for copper-free or copper-mediated click chemistry and an iodide leaving group for efficient alkylation or substitution on nucleophilic partners. Its short PEG spacer supports aqueous compatibility and reduces nonspecific interactions, making it a practical building block for labeling workflows that require precise attachment of alkyne tags to biomolecules, surfaces, or polymeric materials. Alkyne-PEG3-iodide is commonly used in chemical biology and materials research to generate alkyne-bearing conjugates that can subsequently participate in click-based assembly of imaging probes, affinity reagents, and multivalent constructs.

1. Biomolecule Alkyne Labeling

Alkyne-PEG3-iodide is widely used to install an alkyne functionality onto biomolecule scaffolds that contain suitable nucleophilic sites, enabling downstream click conjugation to azide-bearing reporters, affinity ligands, or polymer backbones. The PEG3 spacer helps maintain solubility and spacing between the biomolecule and the reactive handle, which is particularly valuable when preparing conjugates for mechanistic studies, proteomics sample preparation, or multicolor labeling strategies. Researchers often select Alkyne-PEG3-iodide when they need a compact, water-compatible alkyne tag that can be introduced in a controlled manner prior to assembling larger probe architectures.

2. Surface And Material Functionalization

Alkyne-PEG3-iodide supports the preparation of alkyne-functional surfaces and materials used in biosensing, cell-interaction studies, and materials screening platforms. By incorporating the PEG-linked alkyne handle onto polymer films, hydrogel components, or surface-modified substrates, teams can later perform click-based immobilization of biomolecular capture agents or fluorescent reporters using complementary azide reagents. The iodide functionality provides a convenient route to tether the PEG-alkyne motif to nucleophilic surface chemistries, while the PEG spacer improves accessibility of the alkyne for subsequent conjugation, helping maintain consistent labeling density and surface reactivity.

3. PEG Linker For Multivalent Probes

Alkyne-PEG3-iodide is frequently employed as a linker reagent to build multivalent probe systems where controlled spacing between reactive groups improves conjugate organization and reduces steric crowding. The reagent’s PEG3 segment provides a flexible distance element that can separate the alkyne handle from the point of attachment, which is useful when constructing libraries of clickable building blocks for imaging reagents, affinity tools, or combinatorial chemical biology studies. In workflows that rely on stepwise assembly, Alkyne-PEG3-iodide enables the introduction of a single, well-defined click handle that can be used to generate probe variants with different payloads through subsequent azide coupling.

4. Polymer and Nanoparticle Conjugation

Alkyne-PEG3-iodide is applicable to the functionalization of polymers and nanoparticle formulations that require stable incorporation of click-reactive alkyne groups for modular post-functionalization. Materials scientists and chemical engineers commonly use the PEG-linked alkyne motif to create clickable polymer carriers, surface-modified nanoparticles, or hybrid conjugates that can be further decorated with azide-functional components such as fluorescent dyes, targeting motifs, or crosslinking partners. The PEG3 spacer contributes to colloidal compatibility and helps preserve the accessibility of the alkyne for efficient downstream click assembly, supporting reproducible fabrication of conjugated material platforms used in research-grade labeling and probe development.