Azido-PEG9-alcohol | CAS 1984776-37-5

Azido-PEG9-alcohol is a PEG-based azide building block designed for copper-free and copper-mediated click chemistry workflows, enabling efficient installation of azide handles onto surfaces, linkers, and biomolecule conjugates. The reagent combines a terminal azide functional group with a PEG9 spacer terminated by an alcohol, offering strong solubility and flexible spacing that is widely used to reduce steric effects in labeling and conjugation. As a versatile click-compatible intermediate, Azido-PEG9-alcohol is commonly selected for constructing modular probe platforms, bioconjugation reagents, and PEGylated materials where controlled attachment chemistry is required.

1. Bioconjugation Linkers

Azido-PEG9-alcohol is frequently used as a PEG spacer–bearing azide linker to prepare bioconjugates for chemical biology studies, including labeling strategies that require a stable azide handle for subsequent click attachment. Researchers incorporate the PEG9 alcohol motif to improve aqueous compatibility and to help maintain accessibility of the conjugated biomolecule or targeting moiety after coupling. The terminal alcohol provides a convenient functional handle for downstream derivatization into activated esters, carbamates, or surface-reactive intermediates, supporting workflows that generate azide-functional conjugates for imaging reagents, affinity probes, and assay components.

2. Surface And Material Functionalization

Azido-PEG9-alcohol is well suited for engineering azide-functional coatings and functional materials where PEG spacing improves wetting, reduces nonspecific interactions, and promotes uniform ligand presentation. Materials scientists use the alcohol terminus to further couple the reagent to polymer backbones, nanoparticles, or solid supports, yielding azide-bearing surfaces that can be addressed by click chemistry in subsequent assembly steps. This approach is commonly applied to create modular interfaces for biosensing platforms, cell-interaction studies, and multicomponent material systems that require orthogonal, handle-based conjugation.

3. Molecular Imaging Probe Assembly

Azido-PEG9-alcohol is used to build imaging and detection probe scaffolds that rely on click chemistry for modular attachment of reporters, affinity tags, or signal-generating components. The PEG9 spacer helps maintain probe solubility and reduces steric hindrance around the azide site, which is important when assembling multicomponent constructs such as fluorescent, luminescent, or affinity-based imaging reagents. By introducing a defined azide functionality with a flexible linker, the reagent supports streamlined probe construction pipelines used in research laboratories developing chemically addressable imaging tools.

4. Diagnostic Reagent Development

Azido-PEG9-alcohol supports the development of diagnostic reagent components and assay building blocks that benefit from azide-mediated click assembly and PEG-driven reduction of nonspecific binding. In many reagent workflows, the azide handle enables late-stage conjugation of detection elements to capture molecules, polymers, or bead surfaces, allowing consistent manufacturing of assay-ready conjugates from standardized intermediate materials. The alcohol terminus provides a practical entry point for generating derivatized forms that can be integrated into test formats, including reagent conjugates designed for robust performance in complex assay matrices.