1. From Specific γ-CD/[Nb 6 Cl 12 (H 2 O) 6 ] 2+ Recognition to Biological Activity Tuning.
- Author
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Ivanov AA, Pozmogova TN, Solovieva AO, Frolova TS, Sinitsyna OI, Lundovskaya OV, Tsygankova AR, Haouas M, Landy D, Benassi E, Shestopalova LV, Falaise C, Cadot E, Shestopalov MA, Abramov PA, and Sokolov MN
- Subjects
- Biological Phenomena, Calorimetry, Magnetic Resonance Spectroscopy, Water chemistry, Niobium chemistry, gamma-Cyclodextrins chemistry
- Abstract
Specific molecular recognition of γ-cyclodextrin (γ-CD) by the cationic hexanuclear niobium [Nb
6 Cl12 (H2 O)6 ]2+ cluster complex in aqueous solutions results in a 1:1 supramolecular assembly {[Nb6 Cl12 (H2 O)6 ]@γ-CD}2+ . NMR spectroscopy, isothermal titration calorimetry (ITC), and ESI-MS were used to study the interaction between the inorganic cluster and the organic macrocycle. Such molecular association affects the biological activity of [Nb6 Cl12 (H2 O)6 ]2+ , decreasing its cytotoxicity despite enhanced cellular uptake. The 1:1 stoichiometry is maintained in solution over a large window of the reagents' ratio, but crystallization by slow evaporation produces a 1:2 host-guest complex [Nb6 Cl12 (H2 O)6 @(γ-CD)2 ]Cl2 ⋅20 H2 O featuring the cluster encapsulated between two molecules of γ-CD. The 1:2 complex was characterized by XRD, elemental analysis, IR spectroscopy, and thermogravimetric analysis (TGA). Quantum chemical calculations were performed to model host-guest interaction., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)- Published
- 2020
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