Inclusion complex of α-cyclodextrin and the extended viologen dication: a model of an insulated molecular wire

0361419 - ÚFCH JH 2012 RIV NL eng J - Journal Article
Hromadová, Magdaléna - Kolivoška, Viliam - Gál, Miroslav - Pospíšil, Lubomír - Sokolová, Romana - Valášek, Michal
Inclusion complex of α-cyclodextrin and the extended viologen dication: a model of an insulated molecular wire.
Journal of Inclusion Phenomena and Macrocyclic Chemistry. Roč. 70, 3-4 (2011), s. 461-469. ISSN 0923-0750. E-ISSN 1573-1111
R&D Projects: GA MŠMT(CZ) MEB041006; GA MŠMT LC510; GA MŠMT OC 140; GA ČR GA203/08/1157; GA ČR GA203/09/1607; GA AV ČR IAA400400802
Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40550506
Keywords : alpha-cyclodextrin * extended viologen * complex formation
Subject RIV: CG - Electrochemistry
Impact factor: 1.886, year: 2011

An extended viologen dication 1, containing one viologen subunit, was used as a model for the inclusion complex formation between cyclodextrin (CD) molecules and molecular wires comprising several subunits. UV–Vis and fluorescence spectroscopic measurements confirmed the formation of two types of the inclusion complexes 1:1 and 2:1 between αCD and 1 in the aqueous solution containing 20% of ethanol. The complex formation constants were obtained from the fluorescence spectral changes: K a = 25 ± 3 mM−1 for [αCD–1] complex and K a = 0.21 ± 0.07 mM−2 for [(αCD)2–1] complex, respectively. Cyclodextrins βCD and γCD do not form the inclusion complexes with 1 in these aqueous solutions. The time-dependent differential capacitance measurements confirmed the adsorption of 1 in the form of a complex at the electrode/electrolyte interface.
Permanent Link: http://hdl.handle.net/11104/0198732