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Host–guest complexes of mixed glycol-phenanthroline cryptands: prediction of ion selectivity by quantum chemical calculations IV

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Abstract

Structures and complex-formation energies, calculated with DFT (B3LYP/LANL2DZp) for the cryptands [2.2.phen] and [2.phen.phen] with endohedrally complexed alkali and alkaline earth metal ions, were utilized to predict their ion selectivity. Both cryptands [2.2.phen] and [2.phen.phen] have a cavity size smaller than [2.2.2], [phen.phen.phen] and [bpy.bpy.bpy], and prefer to bind K+ and Sr2+, whereas [2.2.phen] that is larger than [2.phen.phen], has a preference for Ba2+, and [2.phen.phen] favours Na+ and Ca2+. The cryptand flexibility is mainly attributed to the presence of CH2–NSP3···NSP3–CH2 groups.

Graphical abstract

Host–Guest Complexes of mixed Glycol-Phenanthroline Cryptands—Prediction of Ion Selectivity by Quantum Chemical Calculations III

Ralph Puchta* and Rudi van Eldik

Keywords

Cation selectivity

Host–guest

DFT

DFT-studies allow a sensitive analysis of selectivity and cage size. Calculations predict a favourable binding of K+, Sr2+ and Ba2+ by [2.2.phen], and binding of K+, Na+, Ca2+ and Sr2+ by [2.phen.phen]. The cryptands fold around the ions by twisting their torsion angles in order to reach the best coordination mode for each cation.

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Acknowledgements

The authors gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft. We thank Prof. Tim Clark for hosting this work at the Computer Chemistry Center, Nico van Eikema Hommes for helpful discussions and the Regionales Rechenzentrum Erlangen (RRZE) for a generous allotment of computer time.

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Correspondence to Ralph Puchta.

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For “Prediction of ion selectivity by quantum chemical calculations III” see, R. Puchta, R. van Eldik. Aust. J. Chem. 60, 889–897 (2007).

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Puchta, R., van Eldik, R. Host–guest complexes of mixed glycol-phenanthroline cryptands: prediction of ion selectivity by quantum chemical calculations IV. J Incl Phenom Macrocycl Chem 60, 383–392 (2008). https://doi.org/10.1007/s10847-007-9388-y

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