Bromo-PEG1-azide | CAS 1144106-65-9

Bromo-PEG1-azide is a PEG-based azide functional click chemistry reagent that combines an azide handle for copper-free or copper-mediated azide–alkyne cycloaddition with a bromo substituent that can participate in downstream conjugation or surface attachment strategies. Its short PEG spacer provides aqueous compatibility and reduces steric constraints, making it a practical intermediate for building modular bioconjugates, labeling reagents, and PEGylated materials. As a bifunctional linker, Bromo-PEG1-azide is commonly selected when researchers need an azide for click coupling alongside an additional reactive group to enable orthogonal attachment to polymers, surfaces, or biomolecule scaffolds.

1. Surface And Coating Labeling

Bromo-PEG1-azide is used to introduce azide functionality into polymer films, coatings, and functionalized surfaces where subsequent click labeling is performed with complementary alkyne-bearing probes. The PEG spacer helps maintain accessibility of the azide group at interfaces, which is important for consistent probe density in imaging and sensing workflows. The bromo functionality supports integration into surface modification schemes, enabling researchers to generate clickable, PEGylated layers for downstream attachment of fluorescent tags, affinity ligands, or other reporting groups.

2. Biomolecule PEGylation Linkers

Bromo-PEG1-azide serves as a convenient PEGylation and linker component for constructing azide-bearing biomolecule conjugates used in chemical biology and biomaterials research. Researchers incorporate this reagent to create modular conjugation handles that can later be coupled to alkyne-functional partners, such as dyes, capture reagents, or imaging moieties, while the PEG segment improves solubility and reduces non-specific interactions in many assay formats. The additional bromo functionality supports orthogonal attachment strategies during conjugate assembly, allowing parallel development of multi-component labeling reagents.

3. Molecular Imaging Probe Building

Bromo-PEG1-azide is frequently employed as a building block for generating azide-functional imaging probes and diagnostic reagent components that are assembled via click chemistry. By providing an azide group separated by a short PEG spacer, the reagent supports efficient coupling to alkyne-containing reporters while helping preserve probe performance in aqueous labeling conditions. The bromo group can be leveraged during probe construction to enable stepwise incorporation into probe scaffolds, facilitating rapid iteration of labeling chemistries for fluorescence-based and other molecular imaging readouts.

4. Diagnostic Reagent Conjugation

Bromo-PEG1-azide is well suited for preparing azide-functional conjugates used in diagnostic reagent development, including affinity reagents, assay components, and multiplexing platforms that rely on orthogonal chemical handles. Teams often use this reagent to standardize linker architecture so that downstream click coupling to alkyne-bearing detection elements can be performed under controlled conditions, improving reproducibility across reagent batches. The PEG spacer contributes to aqueous compatibility and helps maintain accessibility of the azide for consistent conjugation, while the bromo functionality supports flexible assembly of multi-part assay constructs.