Subcomponent self‐assembly of a cyclic tetranuclear Fe(II) helicate in a highly diastereoselective self‐sorting manner
Anhäuser, J., Puttreddy, R., Glanz, L., Schneider, A., Engeser, M., Rissanen, K., & Lützen, A. (2019). Subcomponent self‐assembly of a cyclic tetranuclear Fe(II) helicate in a highly diastereoselective self‐sorting manner. Chemistry : A European Journal, 25(33), 12294-12297. https://doi.org/10.1002/chem.201903164
Published inChemistry : A European Journal
© 2019 The Authors
An enantiomerically pure diamine based on the 4,15‐difunctionalized [2.2]paracyclophane scaffold and 2‐formylpyridine self‐assemble into an optically pure cyclic metallosupramolecular Fe₄L₆ helicate upon mixing with iron(II) ions in a diastereoselective subcomponent self‐assembly process. The cyclic assembly results from steric strain that prevents the formation of a smaller linear dinuclear triple‐stranded helicate, and hence, leads to the larger strain‐free assembly that fulfils the maximum occupancy rule. Interestingly, use of the racemic diamine also leads to a racemic mixture of the homochiral cyclic helicates as the major product in a highly diastereoselective narcissistic chiral self‐sorting manner given the fact that the assembly contains ten stereogenic elements which can in principle give rise to 149 different diastereomers. The metallosupramolecular aggregates could be characterized by NMR, UV‐Vis and CD spectroscopy, mass spectrometry and X‐ray crystallography.
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Related funder(s)Academy of Finland
Funding program(s)Postdoctoral Researcher, AoF
Additional information about fundingAuthors acknowledge the Studienstiftung des deutschen Volkes for a doctoral scholarship and the Bonn International Graduate School of Chemistry for an international research scholarship (J.A.), the Academy of Finland (R.P.298817)and the University of Jyväskylä, Finland for the financial support.
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