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[NdI2 (thf)5 ], the First Crystallographically Authenticated Neodymium(II) Complex.

Mikhail N Bochkarev1, Igor L Fedushkin1, Sebastian Dechert2

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Angewandte Chemie (International Ed. in English)
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Summary

Researchers developed new low-valent lanthanide compounds, featuring the first crystallographically characterized molecular complexes of neodymium(II) and thulium(II) ions. These novel compounds exhibit a pentagonal-bipyramidal structure with axial iodine atoms.

Keywords:
lanthanidesneodymiumstructure elucidationsubvalent compoundsthulium

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Area of Science:

  • Inorganic Chemistry
  • Lanthanide Chemistry
  • Materials Science

Background:

  • Low-valent lanthanide compounds are crucial for developing new chemical transformations.
  • Characterization of molecular complexes involving rare lanthanide ions like Nd(II) and Tm(II) is limited.
  • Understanding the structural and electronic properties of these species is key to unlocking new reactivity.

Purpose of the Study:

  • To synthesize and characterize novel low-valent lanthanide compounds.
  • To establish new starting materials for low-valent lanthanide chemistry.
  • To investigate the structural features of rare Nd(II) and Tm(II) molecular complexes.

Main Methods:

  • Crystallographic characterization of synthesized complexes.
  • Use of tetrahydrofuran (thf) and 1,2-dimethoxyethane (dme) as coordinating solvents.
  • Synthesis of lanthanide iodide complexes.

Main Results:

  • The first crystallographically characterized molecular complexes of Nd(II) and Tm(II) ions were successfully synthesized: [NdI2(thf)5] (1) and [TmI2(thf)(dme)2] (2).
  • Both complexes adopt a pentagonal-bipyramidal structure.
  • The two iodine atoms in these complexes occupy axial positions.

Conclusions:

  • These findings introduce new starting materials for the burgeoning field of low-valent lanthanide chemistry.
  • The established pentagonal-bipyramidal structure provides insights into the coordination preferences of low-valent lanthanides.
  • This work paves the way for further exploration of the unique reactivity and applications of these rare earth metal compounds.