The title compound was synthesized by the reaction between a manganese(II) carboxylate and the tetradentate Schiff base ligand, 5-Br-salpnH2 [
Recent advances in the coordination chemistry of manganese has been intimately connected to diverse fields such as, asymmetric catalysis [
All chemicals were purchased from E-Merck and used without further purification. IR spectrum was recorded on a
The starting material, [Mn2(Hsal)4(H2O)4], was prepared as reported earlier or alternatively by mixing hot aqueous solutions of sodium saliyclate and manganese(II)chloride (2 : 1 molar ratio), which gave pale pink crystals of the compound in yields greater than 80% in a day’s time [
Data were collected on a Bruker APEX II diffractometer, equipped with a CCD area detector (Cu-K
Crystal data and parameters for data collection for [MnIII(5-Br-salpn)(DMF)2][B(C6H5)4].
Empirical formula | C47H48BBr2MnN4O4 |
Formula weight | 958.46 |
Temperature | 100(2) K |
Wavelength | 1.54178 |
Crystal system | monoclinic |
Space group |
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Unit cell dimensions |
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Volume | 4419.41(7) Å3 |
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4 |
Density (calculated) | 1.441 mg/m3 |
Absorption coefficient | 4.924 mm−1 |
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1960 |
Crystal size | 0.48 × 0.22 × 0.08 mm |
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3.12–67.31° |
Limiting indices | −14 < |
Reflections collected | 36039 |
Independent reflections | 7606 |
Absorption correction | SADABS |
Refinement method | full-matrix least-squares on |
Data/restraints/ |
7606/0/537 |
Goodness-of-fit on |
1.096 |
Final |
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The complex crystallizes in the monoclinic space group,
Molecular structure of [
The Mn–Ophenol bonds [Mn–O2B = 1.8852(12) Å and Mn–O3B = 1.8955(12) Å] are slightly stronger than the Mn–Nimine bonds [Mn–N1 = 2.0259(14) Å and Mn–N4 = 2.0459(14) Å]. Oxygen atoms of the DMF solvent molecules coordinate with the manganese(III) ion and occupy the
Selected bond distances (Å) and bond angles (°) of [MnIII(5-Br-salpn)(DMF)2]+.
Mn–O2B | 1.8852(12) | Mn–N4 | 2.0459(14) |
Mn–O3B | 1.8955(12) | Mn–O2 | 2.2119(12) |
Mn–N1 | 2.0259(14) | Mn–O1 | 2.2282(13) |
O2B–Mn–O3B | 84.32(5) | N1–Mn–O2 | 86.02(5) |
O2B–Mn–N1 | 90.08(5) | N4–Mn–O2 | 83.99(5) |
O3B–Mn–N1 | 174.39(5) | O2B–Mn–O1 | 94.76(5) |
O2B–Mn–N4 | 174.61(5) | O3B–Mn–O1 | 92.88(5) |
O3B–Mn–N4 | 90.62(5) | N1–Mn–O1 | 87.72(5) |
N1–Mn–N4 | 94.97(5) | N4–Mn–O1 | 87.34(5) |
O2B–Mn–O2 | 94.50(5) | O2–Mn–O1 | 168.83(5) |
O3B–Mn–O2 | 94.25(5) |
Symmetry transformations:
Crystal structure of [
Section of the crystal structure of [
The present work investigated a single-step reaction for the synthesis of a Schiff base complex of manganese(III) from a manganese(II) carboxylate. X-ray diffraction analysis of the complex has shown that the high spin
The authors are grateful to Prof. R. Lalancette, Rutgers University, Newark, NJ, USA, for X-ray diffraction analysis.