Four new metal complexes with the amino acid deoxyalliin

Abstract

] were obtained from the reaction of cobalt(II), nickel(II), copper(II) and iron(II) salts with the potassium salt of the amino acid deoxyalliin (S-allyl-L-cysteine). Electronic absorption spectra of the complexes are typical of octahedral structures. Infrared spectroscopy confirms the ligand coordination to the metal ions through (COO -) and (NH 2 ) groups. EPR spectrum of the Cu(II) complex indicates a slight distortion of its octahedral symmetry. Mössbauer parameters permitted to identify the presence of iron(II) and iron(III) species in the same sample, both of octahedral geometry. Thermal decomposition of the complexes lead to the formation of CoO, NiO, CuO and Fe 2 O 3 as final products. The compounds show poor solubility in water and in the common organic solvents.

Chemical, spectroscopic characterization, and in vitro antibacterial studies of a new gold(I) complex with N-acetyl-L-cysteine

“…The suggestion of a polymeric structure is supported by the previously published results on [Pt 2 (m-NAC-S) 2 (bpy) 2 ] (bpy ¼ bipyridine) and [(NAC-S)(H 2 O)Pt(m-NAC-S) 2 Pt(H 2 O)(NAC-S)] Á H 2 O where the sulfur of NAC bridges two metals [19,21]. The insolubility of the complex in both polar and non-polar solvents reinforces the proposition of the polymeric structure, as observed for other polymeric metal complexes involving -amino acids [35][36][37].…”

Aqueous biphasic hydroformylation catalyzed by rhodium carbonyl complexes modified with bioligands

“…In order to further support our hypothesis, FT-IR spectra of Rh/l-Cys complex and of the free aminoacid in the range of 4500-600 cm −1 were recorded. We can observe that the band present in the cysteine spectrum at 2550 cm −1 , due to the S-H stretching, is absent in the Rh/l-Cys spectrum, so confirming the Rh-S interaction; moreover, the strong band at 3427 cm −1 possibly indicates a coordination of the amino group to the metal atom [27].…”

Transformation of substituted cinnamic acids using l-cysteine metal complexes in aqueous media

“…Metal complexes were synthesized by a modified method published by Massabni, Corbi, Melnikov, Zacharias, and Rechenberg (2005). Disodium salt of L-cysteine, prepared from 0.02 mol of Lcysteine and 0.04 mol of NaOH in 50 mL of distilled water, was mixed with an equimolar amount of FeSO 4 Á 7H 2 O or CoSO 4 Á 7H 2 O in 20 mL of distilled water.…”