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Potassium-telluroether interactions: structural characterisation and computational analysis.

Novan A G Gray1, James F Britten2, David J H Emslie1

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Chemical Communications (Cambridge, England)
|January 27, 2025
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Summary
This summary is machine-generated.

This study reports the first unambiguous examples of s-block-telluroether bonding in potassium complexes. Shorter K-Te distances and computational analysis confirm these novel interactions, expanding knowledge of tellurium chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Computational Chemistry

Background:

  • Potassium complexes with tellurium ligands are of interest for understanding novel bonding interactions.
  • Previous studies have explored related alkali metal-chalcogen bonds, but unambiguous examples involving telluroethers were lacking.

Purpose of the Study:

  • To synthesize and characterize novel potassium-telluroether complexes.
  • To provide the first unambiguous experimental and computational evidence for s-block-telluroether bonding.
  • To investigate the structural diversity of these complexes under varying conditions.

Main Methods:

  • Crystallization of potassium complexes from tetrahydrofuran (THF) and hexanes.
  • X-ray crystallography for structural determination of synthesized compounds.
  • Density Functional Theory (DFT) and Quantum Theory of Atoms in Molecules (QTAIM) calculations to analyze bonding.

Main Results:

  • Synthesis and X-ray crystallographic characterization of [K(ATe2Tripp2)(THF)3] (2-Te), revealing significantly shorter K-Te distances compared to the precursor [K(ATe2Tripp2)(dme)2] (1-Te).
  • Computational studies (DFT and QTAIM) provided strong support for K-TeR2 interactions, confirming the s-block-telluroether bond.
  • Isolation of related complexes [K(ATe2Tripp2)(THF)2] (3-Te), [K(ATe2Tripp2)(THF)] (4-Te), and [K(ATe2Tripp2)] (5-Te) under different preparation conditions.
  • Synthesis and partial characterization of selenium analogues (2-Se, 3-Se, 4-Se).

Conclusions:

  • The study presents the first unambiguous examples of s-block-telluroether bonding.
  • The K-TeR2 interactions are experimentally confirmed and computationally supported.
  • The findings open new avenues for exploring bonding in alkali metal-chalcogen chemistry.