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Mimetyki katalazy manganowej w roli syntetycznych antyoksydantów

Zienkiewicz-Machnik Małgorzata, Barszcz Barbara, Nosek Milena

Wiadomości Chemiczne

2021

[Z] 75, 3-4

319--341

The coordination chemistry of manganese complexes with heteroaromatic ligands have received considerable attention in modern inorganic chemistry due to its wide range of applications. One of them is related with its potential biological role associated with prevention of oxidative stress injuries. Manganese complexes are one of the most versatile and interesting synthetic systems that can act as artificial mimics of manganese-containing metalloenzymes such as manganese catalase (Mn-CAT). Due to the potential use as catalytic scavengers of H2O2, numerous and diverse, very structurally interesting Mn compounds exhibiting CAT-like activity have been reported so far. In this short review, the relevant features of both, structural, as well as, functional mimics of manganese catalase and their CAT-like activity are presented and some insights into the role of the bridging ligands, endogenous bases, and first- and second-sphere effects on the catalysis are discussed.

Magnetic ordering processes in manganese(II) di(hydrogen malonate) dihydrate complex studied by ESR spectroscopy

Marczyński S., Typek J., Grech E., Kołodziej B.

Materials Science Poland

2006

Vol. 24, No. 4

1139--1144

A new manganese complex of malonic acid CH2(COOH) 2źMnCO3źH2O was synthesized. Temperature dependence of the electron spin resonance (ESR) spectrum of Mn(II) was investigated in the 4.2-295 K. temperature range. The obtained ESR spectra were successfully fitted by using a Lorentzian-shape function. The fitting revealed existence of about 2% of a spurious phase of the manganese(II) complex. Strong magnetic interactions have been observed in the investigated temperature range with expected magnetic phase transition at TN approximately equals 2.5 K. The integrated intensity, linewidth and resonance field of the ESR spectrum have shown that the spin dynamical fluctuations essentially influence the magnetic system. An anomalous behaviour of the ESR resonance field parameter has been observed below 100 K. and with decreasing temperature the resonance field shifted to higher magnetic fields.