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Related Experiment Videos

Syntheses and Structure Determinations of Calcium Thiolates.

Scott Chadwick1, Ulrich Englich, Bruce Noll

  • 1Contribution from the Department of Chemistry, 1-014 Center for Science and Technology, Syracuse University, Syracuse, New York 13244-4100, and Department of Chemistry and Biochemistry, University of Colorado at Boulder, Boulder, Colorado 80309-0215.

Inorganic Chemistry
|October 24, 2001
PubMed
Summary

Researchers developed new synthetic methods for heavy alkaline-earth chalcogenolates, successfully preparing and characterizing several calcium thiolates. These findings advance the understanding of calcium-sulfur chemistry and coordination complexes.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Heavy alkaline-earth metals, particularly calcium, are less explored in chalcogenolate chemistry compared to lighter congeners.
  • Synthetic routes to well-defined heavy alkaline-earth chalcogenolates are limited, hindering structural and reactivity studies.

Purpose of the Study:

  • To develop novel synthetic methodologies for preparing heavy alkaline-earth chalcogenolates.
  • To structurally characterize new calcium thiolate complexes using advanced spectroscopic and crystallographic techniques.
  • To explore the reactivity of calcium precursors with sterically demanding thiol ligands.

Main Methods:

  • Synthesis of calcium thiolates using various calcium precursors (e.g., amide, metal) and fluorinated/sterically hindered thiols.

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  • Characterization via single-crystal X-ray crystallography, infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy.
  • Exploration of different reaction conditions, including solvent choice (pyridine, THF, liquid ammonia) and additives (crown ethers).

    • Main Results:

    • Preparation and structural elucidation of three distinct calcium thiolate complexes: [Ca(SC(6)F(5))(2)(py)(4)], [Ca(18-crown-6)(NH(3))(3))][SMes](2).2THF, and [Ca(18-crown-6)(SMes)(2)].THF.
    • Isolation and characterization of unexpected reaction products, including a lithium-calcium bromide complex and an ammonium thiolate salt.
    • Demonstration of diverse coordination modes and aggregation states in calcium thiolate chemistry.

    Conclusions:

    • Established effective synthetic routes for novel calcium thiolates with varying steric and electronic properties.
    • Highlighted the versatility of calcium in forming diverse coordination environments with chalcogenolate ligands.
    • Provided fundamental insights into the synthesis and structural diversity of heavy alkaline-earth chalcogenolates.