The equilibria of copper(II) with (S)-glutamic-gamma-hydroxamic acid (H2L) were investigated in aqueous solution by different techniques: glass electrode potentiometry; calorimetry; VIS and CD spectrophotometry; and ES-MS. An unexpected pentacopper(II) 12-metallacrown-4 [Cu5L4H-4](2-) was detected, analogous to those well known formed by alpha- and beta-aminohydroxamic acids, but of lower stability Another five species were found: [CuLH](+); [CuL2H2]; [Cu2L2]; [CuL2H](-); and [CuL2](2-). Their structures are proposed based on both spectroscopic and calorimetric data.
Unexpected formation of a copper(II) 12-metallacrown-4 with (S)-glutamic-g-hydroxamic acid: a thermodynamic and spectroscopic study in aqueous solution
REMELLI, Maurizio
2004
Abstract
The equilibria of copper(II) with (S)-glutamic-gamma-hydroxamic acid (H2L) were investigated in aqueous solution by different techniques: glass electrode potentiometry; calorimetry; VIS and CD spectrophotometry; and ES-MS. An unexpected pentacopper(II) 12-metallacrown-4 [Cu5L4H-4](2-) was detected, analogous to those well known formed by alpha- and beta-aminohydroxamic acids, but of lower stability Another five species were found: [CuLH](+); [CuL2H2]; [Cu2L2]; [CuL2H](-); and [CuL2](2-). Their structures are proposed based on both spectroscopic and calorimetric data.File in questo prodotto:
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