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We synthesized novel ligands to create stable manganese(II) complexes. These complexes exhibit rapid water exchange and unique electronic properties, confirmed by X-ray crystallography and NMR spectroscopy.

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Area of Science:

  • Coordination Chemistry
  • Bioinorganic Chemistry
  • Materials Science

Background:

  • Manganese complexes are crucial in various biological and catalytic processes.
  • Understanding the structure-property relationships of manganese complexes is vital for developing new applications.
  • Ligand design plays a key role in tuning the stability and reactivity of metal complexes.

Purpose of the Study:

  • To synthesize and characterize novel macrocyclic ligands (Hnompa, Hdompa, Htempa) and their manganese(II) complexes.
  • To investigate the thermodynamic stability and dissociation kinetics of these Mn(II) complexes in aqueous solution.
  • To elucidate the coordination environment and dynamic properties of Mn(II) complexes in both solid-state and solution using advanced spectroscopic and computational methods.

Main Methods:

  • Ligand synthesis and characterization.
  • Determination of complex stability constants using potentiometric titrations.
  • Kinetic studies of complex dissociation.
  • X-ray crystallography for solid-state structure determination.
  • Nuclear magnetic relaxation dispersion ((1)H NMRD) and (17)O NMR spectroscopy for solution-state characterization.
  • Density Functional Theory (DFT) calculations.

Main Results:

  • The ligands formed thermodynamically stable Mn(II) complexes with varying stability constants (logKMnL: nompa 10.28, dompa 14.48, tempa 12.53).
  • Dissociation kinetics at neutral pH primarily followed a spontaneous mechanism.
  • X-ray structure revealed a seven-coordinate Mn(II) in the solid state for [Mn2(nompa)2(H2O)2](ClO4)2.
  • Solution studies indicated six-coordinate Mn(II) in [Mn(nompa)](+) with a high water exchange rate (kex = 2.8 × 10(9) s(-1)) and an unusually high (17)O hyperfine coupling constant (AO/ℏ = 73.3 rad s(-1)).
  • DFT calculations accurately predicted the experimental (17)O hyperfine coupling constant.

Conclusions:

  • The synthesized ligands effectively stabilize Mn(II) ions, forming robust complexes.
  • The Mn(II) complexes exhibit distinct solid-state and solution structures and dynamics.
  • The rapid water exchange and unique electronic properties of the [Mn(nompa)](+) complex suggest potential applications in catalysis or as MRI contrast agents.
  • The study highlights the interplay between ligand structure, metal coordination, and complex properties.