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Formation of Dinuclear Copper(II) Complexes from a Macrocycle with Built-in Pyrazole Groups
Richard H. Bode1, Johan E. Bol, Willem L. Driessen
1Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, and Bijvoet Centre for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Inorganic Chemistry
|October 24, 2001
Summary
A novel macrocycle (MePy22Pz) was synthesized and used to create two dinuclear copper(II) compounds. These compounds feature copper ions positioned far apart on opposite sides of the macrocyclic ring, influencing their coordination environment.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Macrocyclic Chemistry
Background:
- Macrocyclic ligands are crucial in coordination chemistry for creating stable metal complexes.
- Designing macrocycles with specific donor atoms allows for control over metal ion coordination and properties.
Purpose of the Study:
- To synthesize a novel 22-membered macrocycle with pyrazole and pyridine groups.
- To prepare and characterize dinuclear copper(II) complexes using this macrocycle.
- To investigate the coordination environment and metal-metal distances in the resulting copper complexes.
Main Methods:
- Multi-step synthesis of the macrocycle (MePy22Pz).
- Preparation of two distinct dinuclear copper(II) compounds through reactions with the macrocycle and different counterions (nitrate and triflate).
- Characterization of the copper(II) compounds, likely involving techniques such as X-ray crystallography to determine structural details and copper-copper distances.
Main Results:
- Successful synthesis of the 22-membered macrocycle (MePy22Pz) containing four pyrazole and two pyridine groups.
- Formation of two dinuclear copper(II) complexes, [Cu(2)(MePy22Pz)(NO(3))(4)](MeOH)(2) and [Cu(2)(MePy22Pz)(CF(3)SO(3))(2)(H(2)O)(2)](CF(3)SO(3))(2)(MeOH)(2).
- Copper(II) ions adopted a square pyramidal N(3)O(2) coordination geometry, with varying oxygen donors from nitrate, triflate, and water molecules. The copper ions were positioned on opposite sides of the macrocycle, resulting in significant Cu-Cu distances (8.668(4) Å and 6.814(1) Å).
Conclusions:
- The synthesized macrocycle effectively coordinates two copper(II) ions in a manner that separates them spatially.
- The coordination environment around the copper ions can be modulated by the choice of counterions and solvent molecules.
- The study demonstrates the utility of this macrocycle in constructing discrete dinuclear copper complexes with tunable properties.