Solid-state structures and solution studies of novel cyclopentadienyl mercury compounds

Area of Science:

• Organometallic Chemistry
• Inorganic Chemistry
• Materials Science

Background:

• Mercury cyclopentadienyl complexes are of interest due to their unique bonding and structural properties.
• Understanding the coordination chemistry of mercury is crucial for various applications.

Purpose of the Study:

• To synthesize and characterize novel mercury cyclopentadienyl complexes.
• To investigate the structural diversity and bonding characteristics of these complexes.
• To explore the influence of substituents on the mercury coordination environment.

Main Methods:

• Synthesis of mercury cyclopentadienyl complexes via reaction of HgCl2 with KCp' salts or transmetalation with ZnCp'2.
• Characterization using solution NMR spectroscopy.
• Solid-state structure determination via X-ray diffraction studies.
• Computational analysis using Density Functional Theory (DFT).

Main Results:

• Six new mercury cyclopentadienyl complexes, Hg(eta1-Cp')Cl and HgCp'2, were successfully prepared.
• NMR studies indicated nonfluxional behavior for SiMe3-substituted complexes.
• X-ray crystallography revealed eta1-Cp' coordination and linear/almost linear C-Hg-Cl/C-Hg-C environments.
• HgCp'2 compounds displayed insular structures, while HgCp'Cl derivatives formed polymeric chains or tetrameric structures through Hg...Cl interactions.

Conclusions:

• The synthesis provides access to a range of mercury cyclopentadienyl complexes with diverse structures.
• Secondary Hg...Cl interactions play a significant role in dictating the solid-state architectures.
• DFT investigations offer insights into the electronic structure of these mercury compounds.