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Structure-directing influence of halide in mercury thiolate clusters
Mohan S Bharara1, Thanhhoa H Bui, Sean Parkin
1Department of Chemistry, University of Kentucky, Lexington, 40506, USA.
Inorganic Chemistry
|August 3, 2005
Summary
Researchers synthesized novel hexanuclear and nonanuclear mercury complexes using 2-aminoethanethiol hydrochloride. These complexes exhibit unique coordination environments and structural features, including halide-mediated secondary structures and intermolecular hydrogen bonding.
Area of Science:
- Inorganic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- 2-aminoethanethiol hydrochloride is a versatile ligand in coordination chemistry.
- Mercury(II) halides are known to form diverse polynuclear complexes.
Purpose of the Study:
- To synthesize and characterize novel mercury-thiolate complexes.
- To investigate the coordination environments and structural properties of the resulting complexes.
Main Methods:
- Reaction of 2-aminoethanethiol hydrochloride with mercury(II) chloride and bromide.
- Single X-ray crystallography for structural determination.
- Spectroscopic characterization (NMR, UV-Vis, IR, Raman) and thermogravimetric analysis.
Main Results:
- Formation of discrete hexanuclear ([Hg(6)Cl(8)(SCH(2)CH(2)NH(3))(8))]Cl(4).4H(2)O) and nonanuclear ([Hg(9)Br(15)(SCH(2)CH(2)NH(3))(9)](Cl(0.8)Br(0.2))(3)) mercury complexes.
- Observation of unusual coordination environments around mercury atoms (3-, 4-, and 5-coordinate).
- Halide-mediated secondary structures and intermolecular hydrogen bonding forming 3D networks.
- Short Hg...Hg interactions observed in both complexes.
Conclusions:
- The study successfully synthesized novel mercury-thiolate complexes with unique structural motifs.
- The coordination geometry around mercury is highly variable, influenced by thiolate and halide ligands.
- Intermolecular interactions play a crucial role in the overall network structure of these compounds.