Crystal and molecular structure of glycinehydroxamic acid

X-Ray and potentiometric studies on a pentanuclear copper(II) complex with β-alaninehydroxamic acid

“…From the considerations presented above it is possible that the major species in solution at pH 4.5-9 is a pentanuclear species [Cu5A,H-J2+. The pH-metric data for this pH range (about 100experimental points) could be evaluated satisfactorily by assuming this complex with a stability constant log P = 46.66 (7). The formation of other complexes has to be presumed below pH 4.5.…”

Stabilities and coordination modes of glycinephosphonic acid in copper(II) heteroligand complexes with ethylenediamine, diethylenetriamine or N,N,N′,N′,N″-pentamethyldiethylene triamine in aqueous solution

“…Aminohydroxamic and aminophosphonic acids may be considered as the corresponding amino acid derivatives in which carboxylic group is replaced by hydroxamic or phosphonic function, respectively. The hydroxamate (-CONHOH) and phosphonate (-PO 3 H 2 ) groups have different geometry (the former group is planar [27,28] and the latter is tetragonal), size, basicity, charge and type of donors. Hence, the comparison of their interactions with various metal ions in the ternary systems may contribute to a better understanding of their biological activity.…”

General regioselective synthesis of 2,2-disubstituted 3-hydroxyimidazolidin-4-ones

“…In fact, the molecule of GlyHA in a crystalline state exists as the zwitterion NH 3 + CH 2 C(O)N -OH (B), containing a deprotonated amide N atom and a planar hydroxamate-anionic group of cis configuration. 10 Moreover, the comparison of the bond lengths of the GlyHA amide group [C=O, 1.296(2) Å and C sp 2 -N, 1.294(3) Å] 10 with the mean X-ray diffraction lengths of the corresponding bonds for secondary acyclic amides [C=O, 1.231 Å and C sp 2 -N, 1.334 Å] 11(a) indicates a high contribution of the A 2 resonance structure in crystalline GlyHA.…”