Fluorescein-PEG5-Acid

Name: Fluorescein-PEG5-Acid
CAS#: 2183440-40-4
Chemical Formula: C34H38N2O12S
Exact Mass: 698.2145
Molecular Weight: 698.74
Elemental Analysis: C, 58.44; H, 5.48; N, 4.01; O, 27.48; S, 4.59

Description: Fluorescein-PEG5-Acid is a xanthene dye with excitation/emission maximum 494/517 nm and a free terminal carboxyl acid. Terminal carboxylic acid can react with primary amine groups in the presence of of activators (e.g. EDC, or DCC) to form a stable amide bond. It can be used as a quantum yield standard. The hydrophilic PEG spacer increases solubility in aqueous media and reduces steric hindrance during binding.

IUPAC/Chemical Name: 1-((3',6'-dihydroxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthen]-5-yl)amino)-1-thioxo-5,8,11,14,17-pentaoxa-2-azaicosan-20-oic acid

InChi Key: CYVBKXKXVSETJX-UHFFFAOYSA-N

InChi Code: InChI=1S/C34H38N2O12S/c37-23-2-5-27-29(20-23)47-30-21-24(38)3-6-28(30)34(27)26-4-1-22(19-25(26)32(41)48-34)36-33(49)35-8-10-43-12-14-45-16-18-46-17-15-44-13-11-42-9-7-31(39)40/h1-6,19-21,37-38H,7-18H2,(H,39,40)(H2,35,36,49)

SMILES Code: O=C(C1=C2C=CC(NC(NCCOCCOCCOCCOCCOCCC(O)=O)=S)=C1)OC32C4=CC=C(O)C=C4OC5=C3C=CC(O)=C5

Appearance: Solid powder