Dimanganese(II) complexes of a new phenol-based dinucleating ligand with two amino chelating arms: synthesis, structure and catalase-like activity
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 24,p. 4015-4020
- https://doi.org/10.1039/dt9950004015
Abstract
A new phenol-based dinucleating ligand with two amino chelating arms, 2,6-bis{[N-(2-dimethylaminoethyl)-N-methyl]aminomethyl}-4-methylphenolate (L–), formed dinuclear manganese(II) complexes [Mn2L(p-XC6H4CO2)2(NCS)(MeOH)](X = H 1, Cl 2, Me 3 or NO24). X-Ray analysis revealed that complex 1 crystallizes in the monoclinic space group P21/c, a= 12.607(3), b= 19.566(6), c= 16.743(5)Å and β= 107.56(2)°. The two magnese ions are bridged by the phenolic oxygen and two benzoate groups. The NCS– ion is co-ordinated to one of the maganese ions through its nitrogen and the methonal molecule to the other, providing distorted-octahedral geometries around each maganese. Magnetic susceptibility measurements over the temperature range 4.2–300 K indicated a weak antiferromagnetic interaction (J=–3 to –5 cm–1 based on Ĥ=–2JŜ1·Ŝ2). The complexes show a catalase-like activity in disproportionating H2O2 in dimethylformamide. The rate of dioxygen evolution was proportional to the concentration of H2O2 and the rate constant decreased in the order 1(X = H) > 2(Cl) > 3(Me) > 4(NO2).Keywords
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