Sulfo-Cyanine7.5isaheptamethynecyaninedyeforthenearinfraredregionofthespectrum,whichisveryhydrophilic,andwatersoluble.ThefluorophoreresemblesICG(indocyaninegreen)thathasalonghistoryofinvivouse,andisevenapprovedforhumanangiography.However,comparedtoICG,sulfo-Cyanine7.5hasasignificantlyimprovedfluorescencequantumyieldduetotheruggedpolymethinechainreinforcedwithtrimethylenebridge.
Sulfo-Cyanine7.5isavailableasanumberofreactivederivatives.Thisazidecanbeusedfortheeasylabelingofvariousbiomoleculesbycopper-catalyzedorcopperfreeClickchemistry.
Generalproperties
| Appearance: | darkcoloredsolid | 
| MassspecM+increment: | 1050.3 | 
| Molecularweight: | 1165.51 | 
| Molecularformula: | C48H51N6K3O13S4 | 
| Solubility: | goodinwater,DMSO,DMF | 
| Qualitycontrol: | NMR1H,HPLC-MS(95%) | 
| Storageconditions: | Storage:24monthsafterreceivalat-20°Cinthedark.Transportation:atroomtemperatureforupto3weeks.Avoidprolongedexposuretolight.Desiccate. | 
Spectralproperties
| Excitationmaximum,nm: | 778 | 
| ε,L⋅mol−1⋅cm−1: | 222000 | 
| Emissionmaximum,nm: | 797 | 
| CF260: | 0.09 | 
| CF280: | 0.09 |