4LSC2877 SQpeg-COOH CAS# 1643764-45-7

Catalog Number: 4LSC2877
CAS #: 1643764-45-7
Name: SQpeg-COOH, (Z)-4-((1-(3-carboxypropyl)-3,3-dimethyl-3H-indol-1-ium-2-yl)methylene)-2-(((Z)-3,3-dimethyl-1-(2,5,8,11-tetraoxatridecan-13-yl)indolin-2-ylidene)methyl)-3-oxocyclobut-1-en-1-olate

SQpeg-COOH is a carboxylic acid far-red squaraine type fluorogenic building block that is useful in the design of probe in biosensing and bioimaging project. SQpeg-COOH present a pegylated squaraine core that enables a very high turn-on response.


  • Polarity-sensitive fluorogenic building block (high turn-on response fluorophore)
  • Absorption & emission in the far-red  (630-700 nm) that enables in vitro & in vivo application
  • High brightness owing to its high molar extinction coefficient Ɛ~330000 M-1cm-1
  • High chemical stability & photostability
  • Molecular Formula: C39H48N2O8
  • Molecular Weight: 672.8 g/mol
  • Specification: Minimum purity: 95.0 %

Squaraine as a bright, stable and environment sensitive far-red label for receptor-specific cellular imaging. Chem. Commun., 51, 2960-2963 , 2015doi:10.1039/C4CC09113B

Fluorogenic Squaraine Dimers with Polarity-Sensitive Folding As Bright Far-Red Probes for Background-Free Bioimaging.
J. Am. Chem. Soc., 137 (1), 405–412, 2015. doi:10.1021/ja5111267