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Sterically Hindered Tellurium(IV) Catecholate as a Lewis Acid.

Pavel A Petrov¹, Elizaveta A Filippova^1,2, Taisiya S Sukhikh¹

¹Nikolaev Institute of Inorganic Chemistry SB RAS, Prosp. Lavrentieva 3, Novosibirsk 630090, Russia.

Inorganic Chemistry

|June 3, 2022

Summary

Sterically hindered tellurium catecholate was synthesized and its adducts characterized. Novel coordination modes and non-covalent interactions were observed, providing insights into tellurium chemistry.

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Area of Science:

Inorganic Chemistry
Organometallic Chemistry
Materials Science

Background:

Sterically hindered ligands are crucial for stabilizing unusual coordination geometries.
Tellurium catecholates offer unique electronic and structural properties.
Understanding intermolecular interactions is key to designing novel materials.

Purpose of the Study:

Synthesize and characterize sterically hindered tellurium catecholate complexes.
Investigate the coordination behavior of O- and N-donors with tellurium catecholates.
Analyze intermolecular interactions in these adducts using computational methods.

Main Methods:

Synthesis of Te(Cat³⁶)₂ from amorphous tellurium and di-tert-butyl-o-benzoquinone.
Isolation and characterization of adducts using single-crystal X-ray diffraction.
Spectroscopic analysis (IR, UV-vis, NMR) and computational studies (DFT, QTAIM).

Main Results:

Successful synthesis of sterically hindered tellurium catecholate Te(Cat³⁶)₂.
Isolation of adducts with O- and N-donors, revealing an unprecedented bridging coordination mode of 2,2'-bipyridine.
Identification and quantification of attractive, non-covalent intermolecular interactions (Te...O, Te...N, Te...C) with strengths of 0.9–5.3 kcal/mol.

Conclusions:

Sterically hindered tellurium catecholates are versatile building blocks for coordination chemistry.
The observed coordination modes and intermolecular interactions offer new avenues for designing tellurium-based materials.
Computational analysis confirms the nature and strength of non-covalent interactions in these systems.