145384-53-8Relevant articles and documents
Delayed ionization following resonant photon absorption and intracluster electron transfer
Dao, P. D.,Castleman, A. W.
, p. 1435 - 1442 (1986)
Ionization of clusters comprised of paraxylene (PX) bound to NH3 and N(CH3)3 is studied following the absorption of photons through the perturbed S1 state of PX.In the case of PX*NH3 where the ionization potential of PX(8.445 eV) lies below that of NH3(10.16 eV), ionization of the cluster near the ionization threshold of PX leads to the formation of the cluster ion (PX*NH3)+.By contrast, for clusters of PX*N(CH3)3 where the ionization potential of N(CH3)3 (7.82 eV) lies below that of PX, resonance absorption through high Rydberg states of PX below its I.P. leads to the production of N(CH3)3+ and H+*N(CH3)3, but no parent cluster ions.In this case, following photon absorption the ionization and formation of N(CH3)3+ is substantially delayed for times ranging from 160-200 ns, the longer values being obtained at lower photon energies.
The Oxidation of Trimethylamine by OH Radicals in Aqueous Solution, as Studied by Pulse Radiolysis, ESR, and Product Analysis. The Reactions of the Alkylamine Radical Cation, the Aminoalkyl Radical, and the Protonated Aminoalkyl Radical
Das, Suresh,Sonntag, Clemens von
, p. 505 - 513 (2007/10/02)
Hydroxyl radical reactions with trimethylamine in aqueous solution lead to the formation of the aminoalkyl radical (A(.)) and its conjugated acid (AH(+.)) as well as to the alkylamine radical cation (CH3)3N(+.) (N(+.)).These radicals are transformed into each other by hydrolytic reactions, e.g. Radicals AH(+.) are more acidic (pKa ca. 3.6) than the radicals N(+.) (pKa ca. 8.0).Consequently, N(+.) predominate over AH(+.) under quasi equilibrium conditions (e.g. in the presence of phosphate buffer) and are the only species observed by ESR in acid solutions.Reacting with the protonated amine, OH radicals abstract hydrogen at nitrogen and at carbon with comparable ease.Reaction of OH radicals with the free amine may initially also generate N(+.), beside H-abstraction at carbon.Radicals A(.) absorb more strongly at 260 nm (ε = 3390 dm3mol-1cm-1) than the radical cation N(+.) (ε = 950 dm3mol-1cm-1).Radical A(.) has reducing properties whereas radicals AH(+.) and N(+.) have oxidizing properties and hence can be monitored with p-nitroacetophenone (the reducing radicals), and Fe(CN)6(4-), N,N'-tetramethyl-p-phenylenediamine and 2,2'-azinobis-(3-ethyl-benzthiazoline-6-sulphonate) (the oxidizing radicals).These radicals mainly (>/=85percent) disproportionate, one of the products being formaldehyde. - Keywords: Radiation Chemistry, Amines, Electron Transfer, Hydrogen Abstraction, Reaction Kinetics
IONIC HYDROGEN BOND. 4. INTRAMOLECULAR AND MULTIPLE BONDS. PROTONATION AND COMPLEXES OF AMIDES AND AMINO ACID DERIVATIVES.
Meot-Ner (Mautner)
, p. 278 - 283 (2007/10/02)
The paper examines the proton affinities and ionic hydrogen bonding of some amides and of the N-acetylated amino acid derivative CH//3CONHCH(CH//3)COOCH//3. The thermochemistry of these species can serve as a model for the energetics of protonated intermediates in acid hydrolysis of amides and the energetics of protonated amide groups in proteins.
