The complexes structures of chromium(III) with ethylglycine and alanine

Line A. Chernushenko

Abstract


The reaction of chromium(III) chloride with the amino acid ethylglycine in a 1:1 molar ratio of metal to ligand has been performed. The complex with monodentate coordinated ethylglycine [Cr(CH3СН2CH(NH3)COO)(H2O)3Cl2]Cl∙3H2O (І) has been synthesized. Interaction of compound (І) with the α-аlanine results in formation of different-ligand complex [Cr(CH3СН2CH(NH3)COO)(СН3CH(NH3)COO)(H2O)3Cl]Cl2 (ІІ). The complexes I and II have been analyzed by IR and UV/Vis spectroscopy. Significant difference in wave numbers of carboxylic group valence vibritations (nas(COO)–νs(COO)=220 cm–1 for (I) and nas(COO)–ν s(COO)=244 cm–1 for (II))confirms that both amino aсids are coordinated to Cr3+ by oxygen of carboxyl group. Compounds (І–ІІ) have the octahedral structure. Two bands of transition (4Т1g¬4A2g and4Т2g¬4A2g) have been observed in the visible part of the spectrum and one band of transition (4Т1g(Р¬4A2g in UV region. The parameters of crystal field of complexes have been calculated (Dq = 1640 cm–1, В= 627 cm–1 and b = 0.61 for (I) and Dq = 1700 cm–1 В= 553 cm–1 and b = 0.54 for (IІ)). The computer three-dimension models of complexes (II) has been created. Geometrical parameters of complexes have been calculated at HF/6-31G(D) level of theory.

Keywords


Сhromium; complex connections; amino acids; аlanine; ethylglycine

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DOI: http://dx.doi.org/10.15421/081611

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