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• W4294904773 startingPage "33" @default.
• W4294904773 abstract "Minimum energy structures of the ground and lowest excited states of aniline (PhNH2) solvated by pyridine (Py) show that the clusters formed are stabilized by hydrogen bonds in which only one or both hydrogen atoms of the NH2 group take part. Two different N–H bonds photodissociation in PhNH2-(Py)n (n = 1,2) complexes, free and hydrogen bonded have been studied by analyzing excited state potential energy surfaces. In the first one, only N–H bonds engaged in hydrogen bonding in these complexes are considered. RICC2 calculations of potential energy (PE) profiles indicate that all photochemical reaction paths along N–H stretching occur mainly via the proton-coupled electron transfer (PCET) mechanism. The repulsive charge transfer 1ππ*(CT) state dominates the PE profiles, leading to low-lying 1ππ*(CT)/S0 conical intersections and thus provide channels for ultrafast radiationless deactivation of the electronic excitation or stabilization to biradical complexes. The second photoreaction consists of a direct dissociation along the free N–H bond of the NH2 group. It has been shown that this process is played by excited singlet states of 1πσ* character having repulsive potential energy profiles with respect to the stretching of N–H bond, which dissociates over an exit barrier about 0.5 eV giving rise to the formation of a 1πσ*/S0 conical intersection. This may cause an internal conversion to the ground state or may lead to H-atom elimination. This photophysical process is the same in both planar and T-shaped conformers of the PhNH2-Py monomer complex. Our findings reveal that there is no single dominating path in the photodissociation of N–H bonds in PhNH2-(Py)n complexes, but rather a variety of paths involving H-atom elimination and several quenching mechanisms." @default.
• W4294904773 created "2022-09-07" @default.
• W4294904773 creator A5043270381 @default.
• W4294904773 creator A5081972228 @default.
• W4294904773 date "2022-09-07" @default.
• W4294904773 modified "2023-10-17" @default.
• W4294904773 title "Radiationless deactivation pathways versus H-atom elimination from the N–H bond photodissociation in PhNH2-(Py)n (n = 1,2) complexes" @default.
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• W4294904773 doi "https://doi.org/10.1007/s43630-022-00295-z" @default.
• W4294904773 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36071272" @default.
• W4294904773 hasPublicationYear "2022" @default.
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