[Sc2(μ-OH)2(H2O)6(NO3)2](NO3)2: aqueous synthesis and characterization

Area of Science:

• Inorganic Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Scandium nitrate solutions are precursors for scandium compounds.
• Controlling pH is crucial for precipitating scandium complexes.
• Hydroxo-bridged dimers represent an interesting structural motif in metal chemistry.

Purpose of the Study:

• To develop a scalable synthesis for a novel scandium compound.
• To characterize the structure and properties of the synthesized scandium complex.
• To investigate the thermal decomposition pathway of the scandium compound.

Main Methods:

• Synthesis from aqueous scandium nitrate using zinc powder as a reducing agent.
• Single-crystal X-ray diffraction for structural determination.
• Fourier-transform infrared (FTIR) spectroscopy combined with ab initio computations for spectral analysis.

Main Results:

• Successful synthesis of [Sc(2)(μ-OH)(2)(H(2)O)(6)(NO(3))(2)](NO(3))(2) with a 65% yield.
• X-ray diffraction confirmed a dimeric structure featuring hydroxo bridges between scandium atoms.
• FTIR analysis, aided by computational modeling, identified characteristic vibrational frequencies.

Conclusions:

• A facile and scalable method for preparing a hydroxo-bridged scandium dimer was established.
• The structural and spectroscopic characterization provides a foundation for further studies.
• Initial thermal analysis indicates transformation to scandium oxide (Sc(2)O(3)).