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A new polymeric alkyl/alkoxide magnesium-sodium inverse crown complex
Sharon E Baillie1, Victoria L Blair, Eva Hevia
1Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland. sharon.baillie@strath.ac.uk
Summary
A novel magnesium-sodium coordination polymer, [Na(2)Mg(2)(C(4)H(11)OSi)(2)(C(4)H(11)Si)(4)](n), was synthesized. This compound forms a 2D polymer with alternating hydrophobic and hydrophilic layers, offering potential for new material applications.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Coordination Chemistry
Background:
- Sodium magnesates are precursors to novel coordination compounds.
- Controlled oxidation is a viable route to synthesize new materials.
- Understanding heterobimetallic structures is crucial for materials design.
Purpose of the Study:
- To synthesize and characterize a new magnesium-sodium coordination polymer.
- To investigate the structural properties and bonding in the new compound.
- To explore the self-assembly and layering behavior of the coordination polymer.
Main Methods:
- Controlled exposure to oxygen of unsolvated sodium magnesate [NaMg(CH(2)SiMe)(3)](n).
- Single-crystal X-ray diffraction analysis to determine the crystal structure.
- Analysis of coordination modes and intermolecular interactions (e.g., Na-Me contacts).
Main Results:
- Successful synthesis of Poly[bis(μ(3)-trimethylsilylmethanolato)tetrakis(μ(2)-trimethylsilylmethyl)dimagnesiumdisodium], [Na(2)Mg(2)(C(4)H(11)OSi)(2)(C(4)H(11)Si)(4)](n).
- The compound exhibits a centrosymmetric dimeric core with an eight-membered heterobimetallic cationic ring.
- Formation of a 2D coordination polymer in the bc plane via Na-Me contacts, stacking into layers along the a direction.
Conclusions:
- The synthesized compound represents a new class of heterobimetallic coordination polymers.
- The observed Na-Me contacts play a significant role in the polymer's structure and stability.
- The resulting layer structure with alternating hydrophobic and hydrophilic regions suggests potential applications in separation or templating.
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