5-(6-(2-(3-Ethyl-1,1-dimethyl-1H-benzo[e]indol-2(3H)-ylidene)ethylidene)-2-(2-(3-ethyl-1,1-dimethyl-1H-benzo[e]indol-3-ium-2-yl)vinyl)cyclohex-1-en-1-yl)-1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-olate | CAS 1841139-28-3

This compound is a highly conjugated, benz[e]indolium-based fluorescent dye designed for strong visible fluorescence arising from an extended π-system. Its cationic, dye-like structure supports bright labeling performance in fluorescence workflows, while the rigid, delocalized chromophore architecture is commonly leveraged in staining and imaging reagents where stable signal generation is required. The presence of electrophilic/functionalized motifs within the dye scaffold also makes it practical as a fluorescent component in probe and conjugate development for microscopy and fluorescence-based readouts.

1. Fluorescence Microscopy Staining

This compound is used as a fluorescent staining reagent for cellular imaging workflows where a cationic, conjugated dye scaffold provides robust fluorescence under standard fluorescence microscopy conditions. Researchers incorporate it into staining protocols to visualize labeled biomolecules, surface-associated components, or fluorescently tagged structures in fixed-cell preparations, where wash-resistant dye retention and clear contrast are important for image-based analysis. The dye's extended aromatic system supports bright emission suitable for routine widefield and confocal imaging, enabling localization studies in cell biology, materials-cell interaction studies, and fluorescence microscopy method development.

2. Fluorescence Imaging Probe Development

This compound serves as a fluorophore building block for fluorescence probe development, including construction of labeled imaging reagents used to track biomolecular conjugates or surface-bound targets. In chemical biology and biomaterials research, it is commonly integrated into probe formats where a stable fluorescent signal is required for tracking conjugate distribution, monitoring labeling uniformity, or generating fluorescent readouts in microscopy and imaging pipelines. Its dye-like, conjugated structure helps maintain strong optical output when incorporated into larger labeling constructs, supporting downstream optimization of probe conjugation strategies for research-grade imaging reagents.

3. Fluorescence-Based Bioassay Readouts

This compound is applied in fluorescence-based assay development where the dye's bright emission supports quantitative signal generation in plate-reader and imaging-compatible formats. In research settings, it is incorporated into assay designs that rely on fluorescent intensity readouts to monitor labeling events, reagent binding to assay surfaces, or fluorescent conjugate formation during workflow optimization. The cationic chromophore character is particularly useful when designing assays that require efficient interaction with charged or affinity-modified assay components, supporting consistent fluorescence signals for comparative studies in chemical biology and biomaterials characterization.

4. Flow Cytometry Fluorescent Labeling

This compound is used as a fluorescence label in flow cytometry experiments that require a strong dye signal for gated population analysis of labeled samples. In cell biology and analytical chemistry workflows, it is incorporated into staining or labeling schemes to generate distinguishable fluorescence for tracking labeled biomolecules, cell-associated components, or dye-tagged constructs. Researchers value the dye's conjugated, cationic nature for producing measurable fluorescence in cytometry-compatible detection channels, enabling reproducible staining contrast across experimental batches during method development and sample comparison.

5. Fluorescent Conjugate and Surface Engineering

This compound is leveraged in fluorescent conjugate preparation and surface functionalization projects where a durable, bright fluorophore is needed to visualize engineered materials or labeled interfaces. Biomaterials groups and materials scientists integrate the dye into labeling strategies for polymer or surface-modified constructs to confirm functionalization, assess spatial distribution, and support microscopy-based characterization of functional surfaces. The dye scaffold's strong fluorescence output makes it useful for quality control of fluorescently tagged materials, enabling researchers to verify labeling consistency and interpret structure-function relationships in engineered biomaterial systems.