Photoaddition of Two Guanine Bases to Single Ru-TAP Complexes. Computational Studies and Ultrafast Spectroscopies to Elucidate the pH Dependence of Primary Processes
Marcelis, Lionel; Rebarz, M.; Lemaur, Vincentet al.
2015 • In Journal of Physical Chemistry B, 119 (12), p. 4488-4500
[en] The covalent photoadduct (PA) between [Ru(TAP)3]2+ (TAP = 1,4,5,8-tetraazaphenanthrene) and guanosine monophosphate (GMP) opened the way to interesting photobiological applications. In this context, the PA’s capability upon illumination to give rise to the addition of a second guanine base is especially interesting. The origins of these intriguing properties are for the first time thoroughly investigated by an experimental and theoretical approach. The PA’s spectroscopic and redox data combined with TDDFT results corroborated with resonance Raman data show that the properties of this PA (pKa around 7) depend on the solution pH. Theoretical results indicate that the acid form PA.H+ when excited should relax to MLCT (metal-to-ligand charge transfer) excited states, in contrast to the basic form PA whose excited state should have LLCT/ILCT (ligand-to-ligand charge transfer/intra ligand charge transfer) characteristics. Ultrafast excitation of PA.H+ at pH 5.9 produces continuous dynamic processes in a few hundred picoseconds involving coupled protonâ€'electron transfers responsible for luminescence quenching. Long-lived species of a few microseconds capable of reacting with GMP are produced at that pH, in agreement with the formation of covalent addition of a second GMP to PA, as shown by mass spectrometry results. In contrast, at pH 8 (mainly nonprotonated PA), other ultrafast transient species are detected and no GMP biadduct is formed in the presence of GMP. This pH dependence of photoreaction can be rationalized with the different nature of the excited states, thus at pH 8, unreactive LLCT/ILCT states and at pH 5.9 reactive MLCT states.
Lemaur, Vincent ; Université de Mons > Faculté des Sciences > Chimie des matériaux nouveaux
Fron, E.
De Winter, Julien ; Université de Mons > Faculté des Sciences > Service de Synthèse et spectrométrie de masse organiques
Moucheron, Cécile
Gerbaux, Pascal ; Université de Mons > Faculté des Sciences > Synthèse et spectrométrie de masse organiques
Beljonne, David ; Université de Mons > Faculté des Sciences > Service de Chimie des matériaux nouveaux
Sliwa, M.
Kirsch-De Mesmaeker, Andrée
Language :
English
Title :
Photoaddition of Two Guanine Bases to Single Ru-TAP Complexes. Computational Studies and Ultrafast Spectroscopies to Elucidate the pH Dependence of Primary Processes
Publication date :
07 December 2015
Journal title :
Journal of Physical Chemistry B
ISSN :
1520-6106
Publisher :
American Chemical Society, United States - District of Columbia
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