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A paramagnetic Cu(I)/Cu(II)/Zn(II) coordination polymer with multiple CN-binding modes and its solid-state NMR
Liang Ouyang1, Pedro M Aguiar, Raymond J Batchelor
1Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, B.C. V5A 1S6, Canada.
Chemical Communications (Cambridge, England)
|February 9, 2006
Summary
A novel mixed-valent copper-zinc polymer with a 2-D layer structure was synthesized. Its paramagnetic nature and complex cyanide bonding were characterized using advanced NMR spectroscopy.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Coordination Chemistry
Background:
- Mixed-valent metal complexes offer unique electronic and magnetic properties.
- Polymer synthesis provides routes to novel materials with extended structures.
- Cyanide ligands play a crucial role in bridging metal centers and influencing structural dimensionality.
Purpose of the Study:
- To synthesize and characterize a novel mixed-valent Cu(I)/Cu(II)/Zn(II) coordination polymer.
- To investigate the structural complexity, including multiple cyanide bonding modes.
- To explore the utility of solid-state NMR spectroscopy for paramagnetic systems.
Main Methods:
- Single-crystal X-ray diffraction for structural determination.
- Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy (13C and 15N MAS NMR) for structural and electronic insights.
- Magnetic susceptibility measurements to confirm paramagnetic behavior.
Main Results:
- A 2-D layered coordination polymer, [Cu(en)2][Zn(NC)4(CuCN)2], was successfully prepared.
- The structure features six unique cyanide ligands in four distinct coordination environments.
- Paramagnetic 13C and 15N MAS NMR spectra provided valuable structural information, despite the paramagnetic nature of the complex.
Conclusions:
- The synthesis of this complex mixed-valent copper-zinc polymer demonstrates the versatility of coordination chemistry.
- The study highlights the challenges and successes in characterizing paramagnetic materials using solid-state NMR.
- The diverse cyanide coordination modes contribute to the formation of the 2-D layered structure.