Protonation site for anilines in aqueous media
نویسندگان
چکیده
منابع مشابه
Solvation and protonation of coumarin 102 in aqueous media: a fluorescence spectroscopic and theoretical study.
The ground- and excited-state protonation of Coumarin 102 (C102), a fluorescent probe applied frequently in heterogeneous systems with an aqueous phase, has been studied in aqueous solutions by spectroscopic experiments and theoretical calculations. For the dissociation constant of the protonated form in the ground state, pKa = 1.61 was obtained from the absorption spectra; for the excited-stat...
متن کاملChemistry in Nanodroplets: Studies of Protonation Sites of Substituted Anilines in Water Clusters Using FT-ICR
Water clusters of protonated substituted anilines generated by an electrospray ion source have been investigated using a Fourier Transform ion cyclotron resonance mass spectrometer. It is observed that evaporation kinetics and cluster distributions are highly dependent on sites of protonation in the substituted anilines. Based on the examination of the water cluster distributions of protonated ...
متن کاملSpectrometric Study of the Oligodeoxyribonucleotide Protonation in Aqueous Solution
UV absorption spectra and circular dichroism spectra of aqueous solutions of cytosinand thymine-containing single-stranded Oligodeoxyribonucleotide 5'-CCTTTCCTTTTCCTTTCC-3'(ckit4) were measured at various рН in the range 3.3–8.9. The chemometric analysis of the multiinstrumental data matrix was carried out. The diagrams of relative contents of complex forms of the DNA molecule absorbing in the ...
متن کاملEquilibrium constants and protonation site for N-methylbenzenesulfonamides
The protonation equilibria of four substituted N-methylbenzenesulfonamides, X-MBS: X = 4-MeO (3a), 4-Me (3b), 4-Cl (3c) and 4-NO(2) (3d), in aqueous sulfuric acid were studied at 25 °C by UV-vis spectroscopy. As expected, the values for the acidity constants are highly dependent on the electron-donor character of the substituent (the pK(BH+) values are -3.5 ± 0.2, -4.2 ± 0.2, -5.2 ± 0.3 and -6....
متن کاملComputed protonation properties: unique capabilities for protein functional site prediction.
Prediction of protein functional sites from 3D structure is an important problem, particularly as structural genomics projects produce hundreds of structures of unknown function, including novel folds and the structures of orphan sequences. The present paper shows how computed protonation properties provide unique and powerful capabilities for the prediction of catalytic sites from the 3D struc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Serbian Chemical Society
سال: 2002
ISSN: 0352-5139,1820-7421
DOI: 10.2298/jsc0202111p