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This study synthesized and characterized novel uranium complexes featuring bulky m-terphenylthiolate ligands. These complexes, including rare nido-metalloboranes, offer insights into uranium-sulfur bonding interactions.

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Area of Science:

  • Organometallic Chemistry
  • Uranium Chemistry
  • Coordination Chemistry

Background:

  • Uranium complexes are of interest for their unique electronic properties and potential applications.
  • The development of novel ligand systems is crucial for controlling the reactivity and structure of uranium compounds.
  • Bulky ligands can stabilize unusual oxidation states and coordination geometries.

Purpose of the Study:

  • To synthesize and characterize new crystalline uranium complexes supported by the bulky m-terphenylthiolate ligand system, SAr.
  • To investigate the reactivity of uranium precursors with the SAr ligand under various conditions.
  • To explore the structural diversity and bonding characteristics of these novel uranium complexes.

Main Methods:

  • Synthesis of uranium complexes using various uranium precursors (UCl4, U(BH4)4, U(BH3)3(toluene)) and the SAr ligand (KSAr, HSAr).
  • Characterization techniques including single-crystal and powder X-ray diffraction, multinuclear NMR, IR, UV-Vis-NIR spectroscopy, SQUID magnetometry, and elemental analysis.
  • Quantum chemical calculations to elucidate U-S bonding interactions.

Main Results:

  • Successful synthesis of five crystalline uranium complexes (1-5) with varying uranium oxidation states (U(IV) and U(III)) and ligand coordination.
  • Isolation of [UIV(SAr)2(Cl)2] (1), [UIV(μ-SAr)(BH4)2(μ-BH4)(μ3-BH4)K]2 (2), [UIII(H3B·SAr κS,H,H)(BH4)2] (3), a mixture of [UIII(SAr)(BH4)2] (4a) and [{UIII(SAr)(BH4)}2{μ-B2H6}] (4b), and [UIII(SAr)2(BH4)] (5).
  • Identification of complex 4b as a rare example of a nido-metalloborane.
  • Detailed characterization of the structural, spectroscopic, magnetic, and electronic properties of the synthesized complexes.
  • Computational analysis provided insights into the nature of uranium-sulfur bonds.

Conclusions:

  • The bulky SAr ligand effectively supports the synthesis of diverse uranium complexes across different oxidation states.
  • The study demonstrates the versatility of uranium precursors in reactions with terphenylthiolate ligands.
  • The characterization of these complexes, including the nido-metalloborane, expands the understanding of uranium coordination chemistry and bonding.
  • Quantum chemical calculations are valuable tools for interpreting bonding in complex uranium systems.