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Updated: Sep 28, 2025
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Published on: March 19, 2020
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Crystal structures of two Co(NCS)2 urotropine coordination compounds with different Co coordinations
Christoph Krebs1, Inke Jess1, Christian Näther1
1Institute of Inorganic Chemistry, University of Kiel, Max-Eyth.-Str. 2, 24118 Kiel, Germany.
Summary
Cobalt(II) thiocyanate reacted with urotropine in ethanol to form two distinct compounds. Crystal structures reveal complex coordination environments and hydrogen-bonding networks in these cobalt complexes.
Area of Science:
- Coordination Chemistry
- Crystal Engineering
- Materials Science
Background:
- Cobalt(II) thiocyanate is a versatile precursor for synthesizing coordination compounds.
- Urotropine (hexa-methyl-ene-tetra-mine) is a unique ligand with multiple nitrogen donor sites.
- Ethanol and water are common solvents influencing crystal packing and coordination.
Purpose of the Study:
- To synthesize and characterize novel cobalt(II) complexes using urotropine and ethanol.
- To elucidate the crystal structures of the resulting coordination compounds.
- To investigate the role of solvent molecules and hydrogen bonding in crystal network formation.
Main Methods:
- Reaction of cobalt(II) thiocyanate with urotropine in ethanol.
- Single-crystal X-ray diffraction analysis.
- Structural characterization and analysis of coordination environments and intermolecular interactions.
Main Results:
- Two distinct cobalt(II) compounds were synthesized and structurally characterized.
- Compound 1 is a mixture of aqua and ethanol cobalt(II) complexes with urotropine ligands, forming 3D networks via hydrogen bonding.
- Compound 2 features discrete cobalt(II) complexes with urotropine and ethanol ligands, also forming layered and 3D structures through hydrogen bonding.
Conclusions:
- The reaction yields complex coordination compounds with varied solvent incorporation.
- Crystal structures are dictated by coordination geometry and extensive intermolecular hydrogen bonding.
- This study highlights the formation of intricate supramolecular architectures in cobalt(II) systems.
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