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- W1997648734 abstract "Protonation, binary and ternary copper(II) complex formation constants of Nτ-methyl-L-histidine, His(τMe) and Nπ-methyl-L-histidine, His(πMe), have been measured through potentiometric titrations. The UV/VIS spectra have been recorded for both the binary systems and the CuII–His(πMe) complexes have been investigated by means of fast atom bombardment mass spectroscopy. The data on the protonation equilibria of the histidine derivatives show the existence of a difference in basicity between the respective π- and τ-nitrogen atoms, thus giving information on the tautomerism involving the imidazole residue of L-histidine (L-His) in the physiological pH range. The complexation behaviour of His(τMe) is quite similar to that of underivatized L-His: the same species are formed and their log β values are very similar. On the contrary, the presence of a methyl substituent on the Nπ atom deeply affects the complexing properties of the amino acid; His(πMe) cannot act as a tridentate ligand for steric reasons and tends to form polynuclear complexes." @default.
- W1997648734 created "2016-06-24" @default.
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- W1997648734 date "1994-01-01" @default.
- W1997648734 modified "2023-10-14" @default.
- W1997648734 title "Binary and ternary copper(II) complexes of Nτ- and Nπ-methyl-L-histidine in aqueous solution" @default.
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- W1997648734 doi "https://doi.org/10.1039/dt9940002049" @default.
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