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. 2020 May 18;85(11):7267–7275. doi: 10.1021/acs.joc.0c00653

Table 1. Spectral Properties of Carbopyronines 580CP, 610CP, and SiR (Reference Dye) in Aqueous PBS Buffer (pH 7.4) at Room Temperature.

dye absorption λmax, nm (ε, M–1 cm–1) fluor. λmax, nm (Φfla) brightness rel. to SiRb D0.5c fluorescence lifetime τ, ns
580CP 582 (90,000) 607 (0.69) 1.63 34.6 3.6
610CP 609 (100,000) 634 (0.59) 1.55 36.4 3.1
SiR 645 (93,000) 661 (0.41) 1 (ref.) 64.5 2.7
a

Fluorescence quantum yield.

b

Expressed as (ε × Φfl)dye/(ε × Φfl)SiR.

c

Dielectrical constant of dioxane (D = 2)–water (D = 80) mixture, in which the fluorescent form (Scheme 4) is present to 50% of its maximal possible concentration.