Solvothermal synthesis and structural characterization of three polyoxotitanium-organic acid clusters

Area of Science:

• Inorganic Chemistry
• Materials Science
• Nanotechnology

Background:

• Titanium oxo-clusters are crucial in materials science for modeling surface interactions.
• Understanding the synthesis and structure of these clusters is key to developing new functional materials.

Purpose of the Study:

• To synthesize and characterize novel titanium oxo-clusters.
• To investigate the structural diversity and potential applications of these clusters.

Main Methods:

• Solvothermal synthesis of titanium(iv) isopropoxide, alcohols, and carboxylic acids.
• Characterization using single-crystal and powder X-ray diffraction, TGA/DSC, microscopy, FTIR, and NMR spectroscopy.
• Hirshfeld surface calculations for packing analysis.

Main Results:

• Three new titanium oxo-clusters (Ti4 and two Ti6 complexes) were successfully synthesized.
• Structural analysis revealed six-coordinated titanium(iv) ions and distinct core structures (Ti4O2, Ti6O4, Ti6O6).
• Cluster geometry is influenced by steric hindrance of carboxylate ligands and reaction concentration.

Conclusions:

• The synthesized titanium oxo-clusters exhibit diverse structures and can be formed through a facile one-step solvothermal process.
• These clusters can serve as molecular models for organic molecules on titania surfaces.
• Potential applications include organic photovoltaics (dye-sensitized solar cells) and other optoelectronic devices.