Superchiral Pd3L6 Coordination Complex and Its Reversible Structural Conversion into Pd3L3Cl6 Metallocycles |
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| Authors: | Dr Ond?ej Jur?ek Pia Bonakdarzadeh Dr Elina Kalenius Dr Juha Matti Linnanto Dr Michael Groessl Dr Richard Knochenmuss Prof Janne A Ihalainen Prof Kari Rissanen |
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| Affiliation: | 1. University of Jyvaskyla, Department of Chemistry, Nanoscience Center, P.O. Box 35, 40014 University of Jyvaskyla (Finland);2. University of Tartu, Institute of Physics, Ravila 14c, 50411 Tartu (Estonia);3. Tofwerk AG, Uttigenstrasse 22, 3600 Thun (Switzerland);4. University of Jyvaskyla, Nanoscience Center, Department of Biological and Environmental Science, P.O. Box 35, 40014 University of Jyvaskyla (Finland) |
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| Abstract: | Large, non‐symmetrical, inherently chiral bispyridyl ligand L derived from natural ursodeoxycholic bile acid was used for square–planar coordination of tetravalent PdII, yielding the cationic single enantiomer of superchiral coordination complex 1 Pd3 L 6 containing 60 well‐defined chiral centers in its flower‐like structure. Complex 1 can readily be transformed by addition of chloride into a smaller enantiomerically pure cyclic trimer 2 Pd3 L 3Cl6 containing 30 chiral centers. This transformation is reversible and can be restored by the addition of silver cations. Furthermore, a mixture of two constitutional isomers of trimer, 2 and 2′ , and dimer, 3 and 3′ , can be obtained directly from L by its coordination to trans‐ or cis‐N‐pyridyl‐coordinating PdII. These intriguing, water‐resistant, stable supramolecular assemblies have been thoroughly described by 1H DOSY NMR, mass spectrometry, circular dichroism, molecular modelling, and drift tube ion‐mobility mass spectrometry. |
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| Keywords: | bile acid chirality metallocycle self‐assembly supramolecular chemistry |
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