Synthesis, characterisation and catalase-like activity of dimanganese(III) complexes of 1,5-bis(5-X-salicylidenamino)pentan-3-ol (X=nitro and chloro)

Synthesis, characterization, theoretical calculations and catalase-like activity of mixed ligand complexes derived from alanine and 2-acetylpyridine

“…Several studies have been carried out on Mn complexes to act as catalase-like [18,19]. In this paper, the synthesis, thermal, magnetic and spectral data of Co II , Ni II , Cr III and Fe III complexes with alanine and 2-acetylpyridine have been described.…”

Structure, magnetic properties, catalase activity and DFT studies of [Mn2(μ-RCOO)2(μ-OR)2]2+ type dinuclear manganese(III,III) complexes

“…Signorella and co-workers have reported detailed kinetic studies supported by spectral, electrochemical and structural characterisations [16][17][18][19]. Their compounds were based on pentadentate Schiff base ligands with Type-II core in which one of the two alkoxo bridges is part of the Schiff base and two monodentate ligands like water, methanol or an anion are present to complete the coordination spheres of the two manganese(III) atoms.…”

“…A variety of Mn(III,III) complexes differing in their core units have been reported so far (Scheme 1). The core structures and observed MnÁ Á ÁMn distances of oxo-and alkoxo-bridged dimanganese(III,III) complexes are as follows: Type-I, [Mn 2 (l-OR) 2 ] 4+ , 3.00-3.04 Å [7][8][9][10][11][12][13][14][15]; Type-II, [Mn 2 (l-RCOO)(l-OR) 2 ] 3+ , 2.91-2.94 Å [16][17][18][19][20][21][22][23]; Type-III, [Mn 2 (l-RCOO) 2 (l-OR) 2 ] 2+ , 2.85-2.87 Å [24][25][26][27][28]; Type-IV, [Mn 2 O 2 ] 2+ , 2.64-2.75 Å [29][30][31][32][33][34][35][36]; Type-V, [Mn 2 (l-RCOO) 2 (l-O)] 2+ , 3.08-3.22 Å [37][38][39][40][41][42][43][44][45][46][47][48]. The first four types form complexes with coplanar equatorial planes and parallel Jahn-Teller axes, while in Type-V complexes the Jahn-Teller axes were inclined by 27-90°.…”

Spectroscopic characterization of some metal complexes derived from 4-acetylpyridine nicotinoylhydrazone

“…The bond distances from Cu, Zn, Mn and Fe to carbonyl oxygen (M-O1) and azomethine nitrogen (M-N2) are shorter than the bond distances in corresponding crystal structures [20][21][22][23]. This behavior may be explained on the basis of strong electrostatic attraction between the donor atoms and the metal cations.…”