Di-μ-chloro-bis{chloro[2-(4-methylphenylamino)-1,2-diphenylethanoximato]copper(II)}

Puschmann, Horst; Howard, Judith A. K.; Soto, Bernardino; Bonne, Raul; Au-Alvarez, Oscar

doi:10.1107/s1600536801019092

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“…Since the three dimension-structure of a biopolymer, chitosan can coordinate with the metal ions forming mono or dinuclear units with possible metallic bridges with chlorine atoms. [40][41][42] In this way, tetracoordinated …”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

Hernández¹,

Yola²,

Mercê³

2007

J. Braz. Chem. Soc.

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O presente estudo forneceu dados para o cálculo das constantes de estabilidade formadas em um sistema aquoso e HCl contendo quitosana e cátions Cu 2+ , Mn 2+ e Zn 2+ . Os diagramas de espécies foram gerados para demonstrar como o pH influencia esses equilíbrios estudados por titulações potenciométricas e espectrofotométricas. Os sólidos extraídos dessas soluções aquosas em HCl foram estudados por espectroscopia no infravermelho. A quitosana complexa-se com os cátions Cu 2+ , Mn 2+ e Zn 2+ a pHs >4 >5 e >2 respectivamente, na razão ligante:metal, 1:1. As constantes de estabilidade calculadas para ML apresentaram a seguinte ordem de estabilidade: Cu 2+ >Zn 2+ >Mn 2+ . Algumas estruturas para os possíveis complexos formados foram sugeridas envolvendo ambos os átomos de N e/ou O como sítios quelantes de uma ou duas unidades monoméricas do biopolímero estudado.This study provided the data for calculating the stability constants formed in the aqueous HCl equilibrium of chitosan and Cu 2+ , Mn 2+ and Zn 2+ , and determined the species distribution diagrams to show the influence of pH in the complexation systems based on data obtained from potentiometric and spectrophotometric titrations. The solid complexes further obtained from these aqueous HCl systems, were investigated by infrared spectroscopy. It was verified that chitosan coordinated with the cations Cu 2+ , Mn 2+ and Zn 2+ at pHs >4 >5 and >2 respectively, in ligand to metal ratio of 1:1. The logarithms of the binding constants for ML species presented the following stability order: Cu 2+ >Zn 2+ >Mn 2+ . Some possible complexed structures were suggested having both N and/or O atoms as binding sites with one or two monomers of the biopolymer studied.

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

Hernández¹,

Yola²,

Mercê³

2007

J. Braz. Chem. Soc.

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Di-μ-chloro-bis{chloro[2-(4-methylphenylamino)-1,2-diphenylethanoximato]copper(II)}

Abstract: The title compound, [Cu2Cl4(C42H40N4O2)], is a binuclear molecule bridged by two Cl atoms. The bridging unit Cu2Cl2 is almost planar and the CuII ions are coordinated by two N and three Cl atoms forming a square pyramid. There are two bifurcated hydrogen bonds.

Cited by 1 publication

References 2 publications

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

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Di-μ-chloro-bis{chloro[2-(4-methylphenylamino)-1,2-diphenylethanoximato]copper(II)}

Abstract: The title compound, [Cu2Cl4(C42H40N4O2)], is a binuclear mol­ecule bridged by two Cl atoms. The bridging unit Cu2Cl2 is almost planar and the CuII ions are coordinated by two N and three Cl atoms forming a square pyramid. There are two bifurcated hydrogen bonds.

Cited by 1 publication

References 2 publications

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

Chemical equilibrium in the complexation of first transition series divalent cations Cu2+, Mn2+ and Zn2+ with chitosan

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Abstract: The title compound, [Cu2Cl4(C42H40N4O2)], is a binuclear molecule bridged by two Cl atoms. The bridging unit Cu2Cl2 is almost planar and the CuII ions are coordinated by two N and three Cl atoms forming a square pyramid. There are two bifurcated hydrogen bonds.