Interaction of beta-cyclodextrin with cadmium(II) ions.
Reduction of Cd(II) on a dropping mercury electrode was used to study interaction of beta-cyclodextrin with Cd(II) ions. It was found that Cd(II) forms Cdbeta-CD(OH)(2)(2-) hydroxy-complex with the anion of beta-cyclodextrin in alkaline solutions (pH>11), the logarithm of stability constant being 10.4+/-0.1 (20 degrees C; I=1.0). The calculated value of the diffusion coefficient equal to 1.0x10(-6)cm(2)/s shows a large size Cd(II) complex species formation in alkaline solutions containing beta-CD.
Norkus
Eugenijus
E
Institute of Chemistry, Laboratory of Catalysis, A. Gostauto 9, Vilnius LT-2600, Lithuania. norkus@ktl.mii.lt
Grinciene
Giedre
G
Vuorinen
Tapani
T
Vaitkus
Rimantas
R
Butkus
Eugenijus
E
D002104:Cadmium / Q000737:chemistry* / Q000378:metabolism; D003505:Cyclodextrins / Q000737:chemistry* / Q000378:metabolism; D004058:Diffusion; D011048:Polarography / Q000379:methods; D012996:Solutions; D047392:beta-Cyclodextrins
D003505:Cyclodextrins; D012996:Solutions; D047392:beta-Cyclodextrins; D002104:Cadmium; C031215:betadex