Catalase Activity of Dinuclear MnIII Compounds with Chlorobenzoato Bridges

Abstract

AbstractThree dinuclear MnIII compounds [{Mn(H2O)(NN)}2(μ‐3‐ClC6H4COO)2(μ‐O)]X2 with NN = 2,2′‐bipyridine (bpy; 1 and 2) or 1,10‐phenanthroline (phen; 3) and X = NO3– (1) or ClO4– (2 and 3) have been synthesized. The X‐ray structures of compounds 1 and 3 were solved and the magnetic properties of the three compounds analyzed. Compounds 1 and 3 showferromagnetic coupling, the J values being 11.8 and 5.7 cm–1,respectively. Compound 2 displays weak antiferromagnetic behavior with a J value of –0.23 cm–1. The catalase activity of these three compounds and that of eight analogous dinuclear MnIII compounds with 2‐ and 4‐chlorobenzoato ligands has been investigated. The presence of different ligands and counteranions allowed the analysis of their effects on the catalytic activity. It was observed that compounds with perchlorate anions show higher activity than compounds with nitrate anions and compounds with 3‐chlorobenzoato ligands are the worst catalysts. Moreover, most of these compounds show higher conversions than other compounds with analogous structures.