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Updated: Jun 11, 2025
10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
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Solvent-Controlled Separation of Integratively Self-Sorted Pd2LA 2LB 2 Coordination Cages
Kristina E Ebbert1, Fabian Sendzik1, Laura Neukirch1
1Department of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Str. 4a/6, 44227, Dortmund, Germany.
Angewandte Chemie (International Ed. in English)
|October 8, 2024
Summary
Metallosupramolecular self-assemblies can be controllably disassembled and reassembled. Solvent choice and guest molecules enable precise control over complex coordination cage structures, demonstrating advanced self-sorting and separation strategies.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Synthesizing complex metallosupramolecular assemblies requires strategies to prevent statistical mixtures.
- Previous work focused on thermodynamically driven transformations from homoleptic to heteroleptic structures.
Purpose of the Study:
- To demonstrate the reversal of integrative self-sorting in metallosupramolecular cages.
- To achieve full separation ('unsorting') of complex assemblies.
- To investigate solvent-specific modulation of cage conversion equilibria.
Main Methods:
- Utilized Pd2LA2LB2-type coordination cages.
- Investigated solvent effects (DMSO vs. MeCN) on self-sorting and re-segregation.
- Employed selective guest-induced precipitation for separation.
- Conducted experimental and theoretical investigations (liquid-state integral equation theory).
Main Results:
- Integrative self-sorting in Pd2LA2LB2 cages was reversed by changing solvent from DMSO to MeCN, favoring homoleptic species.
- Complete separation of homoleptic precursors was achieved via selective precipitation of Pd3LB6 with guest G1.
- In DMSO, a mixture of homoleptic and heteroleptic cages formed defined host-guest complexes upon addition of di-anions G1 and G2.
- Solvent expulsion from Pd2LA4 was identified as a key entropic factor for cage conversion in DMSO.
Conclusions:
- Solvent-specific control over metallosupramolecular self-assembly and disassembly is achievable.
- Selective guest binding and precipitation offer powerful tools for separating complex assemblies.
- Thermodynamic and entropic factors, particularly solvent effects, play crucial roles in modulating self-sorting equilibria.
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