Solvent dependence of excited-state proton transfer from pyranine-derived photoacids.
Solvent dependence of excited-state proton transfer from pyranine-derived photoacids.
复制标题
吡喃衍生光酸激发态质子转移的溶剂依赖性
DOI:
10.1039/c3cp55292f
复制
发表时间:
2014
期刊:
影响因子:
--
通讯作者:
D. Huppert
中科院分区:
文献类型:
--
作者:
C. Spies;S.Shomer;B. Finkler;D. Pines;E. Pines;G. Jung;D. Huppert
Steady-state and time-resolved techniques were employed to study the excited-state proton-transfer (ESPT) rate of two newly synthesized 8-hydroxy-1,3,6-pyrenetrisulfonate (pyranine, HPTS) derived photoacids in three protic solvents, water, methanol and ethanol. The ESPT rate constant kPT of tris(1,1,1,3,3,3-hexafluoropropan-2-yl)-8-hydroxypyrene-1,3,6-trisulfonate, 1a, whose pKa* ∼ −4, in water, methanol and ethanol is 3 × 1011 s−1, 8 × 109 s−1 and 5 × 109 s−1 respectively. (8-Hydroxy-N1,N3,N6-tris(2-hydroxyethyl)-N1,N3,N6-trimethylpyrene-1,3,6 trisulfonamide, 1b) is a weaker acid than 1a but still a strong photoacid with pKa* ∼ −1 and the ESPT rate in water, methanol and ethanol is 7 × 1010 s−1, 4 × 108 s−1 and 2 × 108 s−1. We qualitatively explain our kinetic results by a Marcus-like free-energy correlation which was found to have a general form suitable for describing proton transfer reactions in both the proton-adiabatic and the proton-non-adiabatic limits.
登录
查看更多内容
DOI:
10.1021/jp308746x
发表时间:
2013
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
M. Prémont-Schwarz;T. Barak;D. Pines;E. T. J. Nibbering;E. Pines
通讯作者:
E. Pines
DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
E. Pines;Ben;M. Lang;G. Fleming
通讯作者:
G. Fleming
DOI:
--
发表时间:
1975
期刊:
影响因子:
--
作者:
G. H. Parsons;C. H. Rochester
通讯作者:
C. H. Rochester
影响因子:
2.8
作者:
BORGIS, DC;LEE, SY;HYNES, JT
通讯作者:
HYNES, JT
DOI:
10.1039/c3cp53082e
发表时间:
2013-10
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
作者:
Christian Spies;Björn Finkler;Nursel Acar;Gregor Jung
通讯作者:
Christian Spies;Björn Finkler;Nursel Acar;Gregor Jung