1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate | CAS 1135933-68-4

1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate is a cationic, conjugated cyanine-type fluorescent dye designed for strong visible-light fluorescence and convenient incorporation into labeling workflows. Its extended pi-conjugation supports bright emission, while the benzo[cd]indolium scaffold provides a robust chromophore commonly used in fluorescence imaging and staining contexts where dye-biomolecule conjugates or dye-containing materials are required.

1. Fluorescent Labeling Conjugates

1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate is used as a fluorescent labeling component for preparing dye-biomolecule conjugates in chemical biology research. Investigators incorporate this fluorophore into protein-, peptide-, or nucleic-acid-labeling strategies to generate imaging reagents that report localization and distribution in complex biological samples. The dye's cationic chromophore is particularly useful when electrostatic interactions and hydrophobic partitioning contribute to retention in labeled constructs, enabling downstream fluorescence microscopy readouts and quantitative fluorescence measurements.

2. Fluorescence Microscopy Staining

1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate supports fluorescence microscopy workflows where researchers visualize labeled biomaterials, stained cellular preparations, or dye-containing assay formats. Because the chromophore is built on a highly conjugated indolium system, it is often selected for experiments that require clear optical contrast under standard fluorescence imaging setups. Typical users include cell imaging and materials science groups developing fluorescent staining protocols for fixed samples and for engineered constructs where the dye remains associated with the target-containing region during imaging.

3. Fluorescence-Based Bioassay Development

1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate is frequently used as a reporter dye in fluorescence-based assay development, especially when a stable, highly conjugated fluorophore is needed for signal readout. Assay developers use this dye to construct fluorescent detection reagents for monitoring binding events, labeling steps, or fluorescence-tagged reagent tracking in biochemical workflows. In these applications, the dye's strong emission and conjugated structure help translate chemical labeling into measurable fluorescence signals compatible with plate readers and fluorescence microscopes used in routine assay development.

4. Fluorescent Material and Polymer Labeling

1-Butyl-2-[5-(1-butyl-1H-benzo[cd]indol-2-ylidene)-penta-1,3-dienyl]-benzo[cd]indolium tetrafluoroborate is applied in biomaterials and polymer labeling to create fluorescently traceable materials for imaging and process monitoring. Researchers embed or attach the dye to polymer backbones, coatings, or composite materials to generate stable fluorescence labels that can be tracked during microscopy-based characterization or fluorescence mapping of material distribution. This use case is common in materials science laboratories developing fluorescently labeled hydrogels, membranes, and engineered surfaces where the dye's cationic, conjugated chromophore supports durable association with the material matrix and clear visualization.