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Data for H189

Cat#H189
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MW176.17
StorageL
SolubleDMSO, MeOH
Abs360
EC19,000
Em449
SolventpH 9
pK{a}see Notes
Notes
Spectra of hydroxycoumarins are pH-dependent. Below the pKa, Abs shifts to shorter wavelengths (325–340 nm) and fluorescence intensity decreases. Approximate pKa values are 7.8 (H189, C2111), 7.5 (H185), 7.3 (T659) and 4.9 (D6566, C12881).