Reportamos neste trabalho, a síntese, e a caracterização em solução dos compostos de coordenação de cobre(II) -[Cu II (H 2 bbpeten)](NO 3 ) 2 , [H 2 -(2-hydroxyethyl)ethane-1,2-diamine] -are reported as copper(II) complexes containing alcoholic, pyridine and phenolic arms. Two of the ligands bear a NO 2 group at the para position of one or two of the phenolic moieties. Electrochemical studies have been performed for the proligands and for the copper complexes.
bbpeten = N-(2-hydroxybenzyl)-N,N'-bis(2-pyridylmethyl)-N'-(2-
Este trabalho relata a síntese e a caracterização dos complexos de manganês(II) [Mn II (Hbpeten)] e [Mn II (Hbnbpeten)], respectivamente [N,N'-bis-(2-hidroxibenzil)-N-(2-piridilmetil)-N'-(2hidroxietil)etano-1,2-diamine]manganês(II) e [N,N'-bis-(5-nitro-2-hidroxibenzil)-N'-(2-hidroxietil) etano-1,2-diamin]manganês(II), por análise elementar, voltametria cíclica, espectroscopias eletrônica (UV-Vis) e vibracional (FTIR), ressonância magnética nuclear de hidrogênio (1 H NMR) e espectroeletroquímica de ressonância paramagnética eletrônica (EPR). Os dados de espectroeletroquímica de EPR foram consistentes com a redução de um grupo nitro, tanto no H 3 bnbpeten livre quanto no complexo de manganês. Além disso, os cálculos teóricos foram consistentes com os resultados experimentais, mostrando que somente um grupo nitro contribui para a formação dos orbitais LUMO e sugerindo que os resultados teóricos são adequados para explicar as propriedades eletrônicas dos complexos. The synthesis and characterization of the manganese(II) complexes [Mn II (Hbpeten)] and [Mn II (Hbnbpeten)], where H 3 bpeten and H 3 bnbpeten are respectively [N,N'-bis-(2-hydroxybenzyl)-N-(2-pyridylmethyl)-N'-(2-hydroxyethyl)ethane-1,2-diamine] and [N,N'-bis-(5-nitro-2hydroxybenzyl)-N'-(2-hydroxyethyl)ethane-1,2-diamine], are reported. The characterization was carried out by elemental analyses, cyclic voltammetry, spectroscopic methods (UV-Vis, FTIR, 1 H NMR), electronic paramagnetic resonance spectroelectrochemistry (EPR) and theoretical DFT calculations. The electrochemistry and EPR espectroelectrochemistry data were consistent with the reduction of one of the nitro groups in free H 3 bnbpeten and in the respective manganese(II) complex. These results were supported by DFT calculations, which showed that only one nitro group contributes to the LUMO. The theoretical data appear to be suitable to describe the electronic properties of the compounds.
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