Cyanine5.5 dye, free acid form, unactivated. The dye can be considered non-reactive for most applications. It can be used as a control or reference sample, and for instrument calibration.
Pre-activated NHS ester for the labeling of amine groups is also available.
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General properties
| Appearance: | dark blue powder | 
| Molecular weight: | 619.23 | 
| CAS number: | 1144107-80-1, 1256349-47-9 | 
| Molecular formula: | C40H43ClN2O2 | 
| Solubility: | soluble in organic solvents (DMSO, DMF, dichloromethane), low solubility in water | 
| Quality control: | NMR 1H, HPLC-MS (95%) | 
| Storage conditions: | Storage: 24 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate. | 
  Spectral properties
| Excitation maximum, nm: | 684 | 
| ε, L⋅mol−1⋅cm−1: | 209000 | 
| Emission maximum, nm: | 710 | 
| Fluorescence quantum yield: | 0.2 | 
| CF260: | 0.07 | 
| CF280: | 0.03 |