New dimanganese(III) complexes of pentadentate (N2O3) Schiff base ligands with the [Mn2(μ-OAc)(μ-OR)2]3+ core: Synthesis, characterization and mechanistic studies of H2O2 disproportionation

Self-assembly of a face-shared partial double cubane supported by alkoxo terminal and bridging ligands

“…The azide anions can bind metal ion in a monodentate fashion [24] or show various bridging modes, such as, l-1,1; l-1,1,1; l-1,3; l-1,1,3; l-1,1,3,3 and so forth [25]. Complex 1 can also be synthesized indirectly if Hdfp was mixed previously with a solution of Co(ClO 4 ) 2 AE 6H 2 O in presence of NEt 3 , presumably leading to the formation of an orange intermediate I (Scheme 3) [26]. During the course of this reaction no metal assisted Schiff base condensation between Hdfp and Hael was observed [27].…”

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.…”

“…The parameters obtained by least square fitting are: J = À20.4 cm À1 , zJ 0 = 0.41, g = 2.13, with a least square error of 0.8 Â 10 À4 . Antiferromagnetic interactions with |J| values in the range 6-15 cm À1 have been reported for Type-I [7][8][9][10][11][12][13][14][15] and Type-II [16][17][18][19][20][21][22][23] complexes. Type-V [37][38][39][40][41][42][43][44][45][46][47][48] compounds are weakly coupled with |J| $ 3 cm À1 , with both ferromagnetic and antiferromagnetic examples known.…”

“…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°.…”

Crystal Structure and Magnetic Properties of an Asymmetrical Dinuclear Mn(III) Complex with <i>N</i>-(2-Oxymethylphenyl)salicylideneimine

“…The bond distances between Mn atom and donor atoms of (L1-H) 2- , g = 1.98). 7,8 This work was supported by JSPS KAKENHI Grant Number JP26410075 from Japan Society for the Promotion of Science.…”