New Dinuclear Mn^III Compounds with 2‐MeC₆H₄COO and 2‐FC₆H₄COO Bridges – Effect of Terminal Monodentate Ligands (H₂O, ClO₄^– and NO₃^–) on the Magnetic Properties

Abstract

-. The characterization by X-ray diffraction shows an important disorder in the crystal for the nitrate compounds, principally for compound 3, where each monodentate ligand could be a water molecule

Dinuclear MnIII Compounds [{Mn(bpy)(H2O)}2(μ‐4‐RC6H4COO)2(μ‐O)](NO3)2 (R = Me, F, CF3, MeO, tBu): Effect of the R Group on the Magnetic Properties and the Catalase Activity

“…[1] To mimic this enzyme, several dinuclear Mn III complexes with a [Mn 2 (μ-O)(μ-RCOO) 2 ] 2+ core have been reported in the literature, [2][3][4][5][6][7][8][9][10][11][12] and in some cases, they have been magnetically and structurally characterized. [1] To mimic this enzyme, several dinuclear Mn III complexes with a [Mn 2 (μ-O)(μ-RCOO) 2 ] 2+ core have been reported in the literature, [2][3][4][5][6][7][8][9][10][11][12] and in some cases, they have been magnetically and structurally characterized.…”

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

“…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. Strongest interactions occur in Type-IV compounds which are all antiferromagnetic having |J| value in the range, 90-100 cm À1 .…”

“…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°.…”

In situ synthesis of manganese(III) complexes under control: Crystal structure and magnetic properties

“…Dinuclear Mn(III) complexes were treated as models for understanding the effect of structural parameters in determining the sign and magnitude of exchange coupling interactions between manganese(III) centers [8][9][10][11][12][13][14][15].…”