Sulfo-Cyanine5.5isawater-soluble,hydrophilicfluorophorewhichpossessesemissioninfarredareaofthespectrum,ananalogofCy5.5®.Asothercyaninedyes,sulfo-Cyanine5.5hasanoutstandingmolarextinctioncoefficientwhichgivesrisetoitsbrightfluorescence.
Themoleculecontainsfoursulfogroupsthatprovidehydrophilicityandnegativechargetothefluorophore-thisminimizesnon-specificbinding.
Theazidegroupofsulfo-Cyanine5.5azidecanbeconjugatedwithterminalalkynesinthepresenceofcopper(I)catalyst,orwithcycloalkynesincopperfreestrainpromotedreaction.
Generalproperties
| Appearance: | darkcoloredsolid | 
| MassspecM+increment: | 984.2 | 
| Molecularweight: | 1099.41 | 
| Molecularformula: | C43H45K3N6O13S4 | 
| Solubility: | goodinwater,DMF,DMSO | 
| Qualitycontrol: | NMR1H,HPLC-MS(95%) | 
| Storageconditions: | Storage:24monthsafterreceivalat-20°Cinthedark.Transportation:atroomtemperatureforupto3weeks.Avoidprolongedexposuretolight.Desiccate. | 
Spectralproperties
| Excitationmaximum,nm: | 673 | 
| ε,L⋅mol−1⋅cm−1: | 195000 | 
| Emissionmaximum,nm: | 691 | 
| CF260: | 0.09 | 
| CF280: | 0.11 |