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The structural conversion of multinuclear titanium(IV) μ-oxo-complexes.

Aleksandra Radtke1, Piotr Piszczek, Tadeusz Muzioł

  • 1Nicolaus Copernicus University , Faculty of Chemistry, ul. Gagarina 7, 87-100 Toruń, Poland.

Inorganic Chemistry
|October 7, 2014
PubMed
Summary
This summary is machine-generated.

This study details the transformation of hexanuclear titanium-oxo clusters into tetranuclear ones. Solvent choice critically influences the formation of these multinuclear titanium-oxo complexes.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Coordination Chemistry

Background:

  • Multinuclear oxo-titanium(IV) complexes are versatile materials with diverse applications.
  • Understanding their structural dynamics is key to controlling their properties.
  • Previous research has focused on synthesis, but conversion pathways remain less explored.

Purpose of the Study:

  • To elucidate the structural conversion process from hexanuclear to tetranuclear μ-oxo-titanium(IV) complexes.
  • To identify intermediate species and reaction mechanisms involved in this transformation.
  • To investigate the influence of synthetic conditions, specifically solvent, on cluster formation.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination of hexanuclear and tetranuclear complexes.
  • Spectroscopic techniques including Carbon-13 Nuclear Magnetic Resonance ((13)C NMR), Infrared (IR) spectroscopy, and Mass Spectrometry (MS) for characterizing intermediates.
  • Systematic variation of branched carboxylic acids and solvents during synthesis.

Main Results:

  • Metastable hexanuclear μ-oxo-titanium(IV) complexes, [Ti6O6(O(t)Bu)(O2CR')6], are formed initially.
  • These hexanuclear complexes convert to tetranuclear μ-oxo-titanium(IV) complexes, [Ti4O4(O(t)Bu)4(O2CR')4].
  • The conversion involves the formation and decomposition of smaller titanium-oxo units and intermediate species, such as [Ti3O(O(t)Bu)8(O2CR')2], [Ti4O2(O(t)Bu)6(O2CR')6], and [Ti9O8(O(t)Bu)14(O2CR')6].

Conclusions:

  • The structural conversion from hexanuclear to tetranuclear μ-oxo-titanium(IV) complexes is a stepwise process involving defined intermediates.
  • The choice of solvent significantly impacts the outcome of the cluster formation, dictating the final nuclearity.
  • This work provides fundamental insights into the reactivity and assembly of multinuclear titanium-oxo clusters.