Cyanine3tetrazineisafluorescentdyebearingtetrazinemoietyforaconjugationreactioncalledTCO(trans-cyclooctene)ligation.Actually,tetrazinesreactnotonlywithtrans-cyclooctenes,butalsowith(methyl)cyclopropenesandstrainednon-benzo-fusedcycloalkynes.
Cyanine3isamoderatelyhydrophobicdye,enablinglabelinginnon-aqueousenvironmentaswellasinaqueousmediacontainingsomeorganicco-solventlikeacetonitrileorDMSO.Forreactionsinpurelyaqueousmedia,asulfonatedversionofthisreagentisavailable.
Generalproperties
| Appearance: | darkredsolid | 
| MassspecM+increment: | 611.4 | 
| Molecularweight: | 727.64 | 
| Molecularformula: | C40H46N7BF4O | 
| Solubility: | goodinDCM,DMSO,DMF | 
| Qualitycontrol: | NMR1H,HPLC-MS(95%) | 
| Storageconditions: | Storage:24monthsafterreceivalat-20°Cinthedark.Transportation:atroomtemperatureforupto3weeks.Avoidprolongedexposuretolight.Desiccate. | 
Spectralproperties
| Excitationmaximum,nm: | 555 | 
| ε,L⋅mol−1⋅cm−1: | 150000 | 
| Emissionmaximum,nm: | 570 | 
| Fluorescencequantumyield: | 0.31 | 
| CF260: | 0.04 | 
| CF280: | 0.09 |