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Properties of Transition Metals02:58

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Chromium(IV) siloxide.

Michael P Marshak1, Daniel G Nocera

  • 1Department of Chemistry, Room 6-335, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.

Inorganic Chemistry
|January 24, 2013
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a stable chromium(IV) siloxide complex, Cr(OSi(t)Bu(2)Me)(4). This air- and moisture-stable compound offers insights into tetrahedral chromium(IV) ions in solid oxide lattices.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science

Background:

  • Homoleptic chromium(IV) siloxide complexes are not well-characterized.
  • Understanding the electronic and structural properties of such complexes is crucial for materials science applications.

Purpose of the Study:

  • To synthesize and characterize a novel homoleptic chromium(IV) siloxide complex.
  • To investigate the electronic and structural properties of this complex.
  • To establish a benchmark for tetrahedral chromium(IV) ions in solid oxide lattices.

Main Methods:

  • Reaction of sodium tert-butyldimethylsiloxide with chromium(III) chloride.
  • Crystallization and oxidation to form the target complex.
  • Electronic spectroscopic analysis (UV-Vis) and X-ray crystallography.

Main Results:

  • Synthesis of [Cr(OSi(t)Bu(2)Me)(3)](n) and [Na(THF)][Cr(OSi(t)Bu(2)Me)(4)].
  • Isolation and characterization of the air- and moisture-stable crystalline chromium(IV) siloxide complex, Cr(OSi(t)Bu(2)Me)(4).
  • Spectroscopic data revealed a weak ligand field (Δ(T) = 7940 cm(-1)) and covalent Cr-O bonding.

Conclusions:

  • The study reports the first structural and spectroscopic characterization of a homoleptic chromium(IV) siloxide complex.
  • The complex Cr(OSi(t)Bu(2)Me)(4) serves as a valuable benchmark for tetrahedral chromium(IV) ions in solid oxide materials.
  • The findings contribute to the understanding of chromium-siloxide chemistry and its potential in materials science.