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- W2023139291 abstract "Stable radical cations of dimeric amino acid derivatives of tryptophan and tyrosine were generated by collision-induced dissociation of [CuII(diethylenetriamine)(amino acid derivative)2]•2+. The yields of the dimer radical cations were dependent on both the auxiliary ligand and the tryptophan or tyrosine derivatives used. Amino acid derivatives with an unmodified carboxylic acid group did not generate dimer radical cations. For the amino acid derivatives Ac-Trp-OMe and Ac-Trp-NH2 (Ac is N-acetyl; OMe and NH2 are the methyl ester and amide modifications of the C-terminal carboxylic group), no auxiliary ligand was required for generating the dimer radical cations. Collision-induced dissociation of the [CuII(amino acid derivative)4]•2+ precursor generated the dimer radical cation [(amino acid derivative)2]•+. Stabilizing interactions, most likely involving hydrogen bonding, between the two amino acid derivatives are proposed to account for observation of the dimer radical cations. Dissociation of these ions yields protonated or radical cationic amino acid derivatives; these observations are consistent with the expectation of proton competition between monomeric units, whose proton affinities were calculated using density functional theory." @default.
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- W2023139291 date "2006-04-01" @default.
- W2023139291 modified "2023-09-23" @default.
- W2023139291 title "Stable Gas-Phase Radical Cations of Dimeric Tryptophan and Tyrosine Derivatives" @default.
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- W2023139291 doi "https://doi.org/10.1021/jp060029a" @default.
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