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Early- and Late-Lanthanide Pyridinethiolates: Synthesis, Redox Stability, and Structure
M. Berardini1, Jongseong Lee, Deborah Freedman
1Department of Chemistry, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854-8087.
Inorganic Chemistry
|October 24, 2001
Summary
Lanthanide pyridinethiolate complexes exhibit varying solubility and structural properties. These compounds, including cerium, holmium, thulium, and ytterbium, offer insights into lanthanide coordination chemistry and electronic transitions.
Area of Science:
- Inorganic Chemistry
- Coordination Chemistry
- Lanthanide Chemistry
Background:
- Lanthanides form stable complexes with pyridinethiolate (SPy) ligands.
- Solubility of neutral lanthanide complexes (Ln(SPy)3) increases with decreasing lanthanide ion size.
Purpose of the Study:
- To synthesize and characterize early and late lanthanide pyridinethiolate complexes.
- To investigate the structural and electronic properties of these complexes.
Main Methods:
- Synthesis of homoleptic lanthanide thiolates.
- Low-temperature structural characterization using X-ray crystallography.
- Spectroscopic analysis to understand electronic transitions.
Main Results:
- Formation of soluble homoleptic cerium thiolate [PEt4][Ce(SPy)4] (1).
- Isolation of isostructural [PEt4][Ln(SPy)4] complexes for Holmium (2) and Thulium (3).
- Characterization of divalent and trivalent Ytterbium complexes, Yb(SPy)2 (4) and Yb(SPy)3 (5), with distinct structures and colors.
Conclusions:
- Lanthanide pyridinethiolate complexes display tunable solubility and structural diversity.
- Electronic properties, such as charge transfer excitations, are observed in Ytterbium complexes.
- The study provides a foundation for understanding lanthanide coordination chemistry with sulfur-containing ligands.