. Author manuscript; available in PMC: 2020 Jan 8.

Published in final edited form as: Macromolecules. 2018 Dec 20;52(1):236–248. doi: 10.1021/acs.macromol.8b02517

Table 1.

Photophysical Properties of Halogenated Xanthene Dyes

	Φ_F	Φ_T^55,64–68	k_r⁶⁹ (10⁸ s^-1)	k_nr⁶⁹ (10⁸ s^-1)	τ_T^a (ms)	λ_max^b (nm)	ε_max^b(M^-1 cm^-1)
EB	0.08⁶⁹	0.62–0.69	1.60	18.4	0.35–0.65⁷⁰	548	95000
EY	0.60⁶⁹	0.28–0.32	1.83	1.22	0.6–4.0^70,71	540	87800
RB	0.08⁶⁹	0.76–0.86	1.22	14.0	0.26–1.91⁷²	563	97300
PB	0.24⁷³	0.4	N/A^c	N/A^c	0.12–1.75⁷³	555	93800

τ_T usually has a wide variability depending on conditions; although their values are in the submilliseconds range, this is sufficient for PET processes to proceed.³¹

Determined in model DMSO solution of a typical PET-RAFT system (vide infra).

Not available. k_r: radiative decay constant; k_nr: nonradiative decay constant; Φ_F: fluorescence quantum yield; Φ_T: triplet quantum yield.