Abstract
This paper describes the X-ray crystal structure of a complex of acridono-18-crown-6 ether 3 and lead(II) perchlorate. The structure shows a π–π bonded heterodimer in the crystal. One part of the dimer moves to 9-hydroxyacridine tautomeric form upon lead(II) complexation, in which the lead(II) ion is eight-coordinated and fits well into the cavity of the macrocycle. The other part of the dimer stays in the 9(10H)-acridone tautomeric form, which favors water complexation. The average bond distance of the two tricyclic units (3.5 Å) indicates a strong π–π interaction. The X-ray studies also revealed a cation–π interaction between lead(II) and the electron-rich acridone moiety.
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Financial supports of the Hungarian Scientific Research Fund (OTKA K112289, K109486 and NK84008), the CRP/HUN14-01 ICGEB Research Grant and the New Széchenyi Development Plan (TÁMOP-4.2.1/B-09/1/KMR-2010-0002) are gratefully acknowledged.
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Dedicated to Professor Magdolna Hargittai on the occasion of her 70th birthday.
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Németh, T., Golcs, Á., Leveles, I. et al. Structural characterization of a complex derived from lead(II) perchlorate and acridono-18-crown-6 ether. Struct Chem 26, 1467–1471 (2015). https://doi.org/10.1007/s11224-015-0657-x
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DOI: https://doi.org/10.1007/s11224-015-0657-x