Bis(catecholato-κ² O,O')bis-(dimethyl sulfoxide-κO)titanium(IV)

Area of Science:

• Inorganic Chemistry
• Crystallography
• Coordination Chemistry

Background:

• Titanium(IV) complexes with catecholate ligands are of interest due to their diverse coordination geometries.
• Previous studies have focused on homoleptic or cationic titanium catecholates.
• The synthesis and characterization of heteroleptic titanium catecholates remain less explored.

Purpose of the Study:

• To synthesize and elucidate the crystal structure of a novel heteroleptic titanium(IV) bis-catecholate complex.
• To investigate the coordination geometry and compare it with related titanium complexes.
• To understand the structural implications of using dimethyl sulfoxide (DMSO) as a ligand in titanium catecholate systems.

Main Methods:

• Single-crystal X-ray diffraction analysis was employed to determine the crystal structure.
• The complex was synthesized via thermal reaction of a titanium tris-catecholate precursor in DMSO.
• Structural comparisons were made with existing titanium catecholate complexes, including its bis-DMF analogue.

Main Results:

• The title complex, [Ti(C6H4O2)2(C2H6OS)2], crystallizes in the P21/c space group with two independent molecules.
• Twinning by pseudomerohedry was observed, indicating pseudo-Pbca symmetry.
• The complex exhibits a distorted octahedral geometry with TiO6 metal coordination, similar to its bis-DMF analogue.

Conclusions:

• The successful synthesis and structural determination of this heteroleptic titanium(IV) complex provide valuable insights into titanium coordination chemistry.
• The study highlights the role of DMSO as a ligand and its influence on the geometry of titanium catecholate complexes.
• This work expands the known family of neutral, mono-nuclear bis-catecholate titanium complexes.