%0 Journal Article
%T Probing the Dynamics of Solvation and Structure of the OH- Ion in Aqueous Solution from Picosecond Transient Absorption Measurements
%A Olivier Poizat
%A Guy Buntinx
%J Molecules
%D 2010
%I MDPI AG
%R 10.3390/molecules15053366
%X The reaction of intracomplex proton transfer (44BPY-....HO-H) £¿ 44BPYH. + OH- that follows the photoreduction of 4,4¡¯-bipyridine (44BPY) into its anion radical 44BPY- in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) is investigated in acetonitrile-water mixtures by using picosecond transient absorption. The dependence of the appearance kinetics of the 44BPYH. radical on the water content reveals a highly diffusional proton transfer process that is controlled by the dynamics of solvation of the released hydroxide ion. The results are interpreted on the basis of a two-step mechanism where an intermediate solvation complex (44BPYH.)OH-(H2O)3 is formed first before evolving toward a final four-water hydration structure OH-(H2O)4.
%K transient absorption spectroscopy
%K hydroxide ion solvation
%K solvation dynamics
%K bipyridine
%U http://www.mdpi.com/1420-3049/15/5/3366