Protonation sites and fragmentations of para-aminophenol

Excited States of Proton-Bound DNA/RNA Base Homodimers: Pyrimidines

“…The characterization of the most stable protonated conformer/tautomer is usually obtained through combination of infrared spectroscopy and ab-initio calculations. [16][17][18][19][20][21][22][23][24][25] We have shown that electronic spectroscopy can be also used as a fingerprint to differentiate isomers and assign the most stable structures in the assumption that the thermal equilibrium is obtained in an ion trap, and that the oscillator strength, the Franck Condon factors and the fragmentation yield are known. 9,12,26 In addition to the canonical Watson-Crick pairs, DNA base pairs can form noncanonical pairs 27 for which special hydrogen bonds are found, such as Cytosine···H + ···Cytosine (C 2 H + ) 28 formed in DNA at acidic pH values.…”

Solution equilibria studies of complexes of divalent metal ions with 2-aminophenol and 3,4-dihydroxybenzoic acid

“…Both phenolics are known to possess different binding sites that may play important roles in their chelating activity. 2-Aminophenol contains neighboring N and O donor atoms in the aromatic ring, which allow the compound to form stable fivemembered-ring complexes with metal ions [14]. The compound was also found to have antibacterial activity against gram-negative Bacillus [15,16].…”

Communication: Identification of daughter ions through their electronic spectroscopy at low temperature

“…Moreover, in IRMPD experiments, the identification of the tautomers is strongly dependent on the IRMPD dissociation yield, which is a non-linear process and thus the intensities of the bands are not reliable. 6 We propose a method to characterize the isomeric structure of the ionic photo-product. The first step is the photofragmentation of the selected cold parent ions, the second step is to cool down a particular daughter ion of interest at low temperature before photofragmentation.…”