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Stability constants of adducts of succinate copper(II) complexes with β‐cyclodextrin determined by capillary electrophoresis
Author(s) -
Sursyakova Viktoria V.,
Rubaylo Anatoly I.
Publication year - 2018
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201700378
Subject(s) - chemistry , adduct , copper , capillary electrophoresis , stability constants of complexes , cyclodextrin , electrophoresis , electrolyte , ionic strength , metal , chelation , ionic bonding , crystallography , inorganic chemistry , ion , chromatography , organic chemistry , aqueous solution , electrode
Cyclodextrins (CD) form inclusion complexes with different “guests” owing to the fact that the shape of the CD molecule is a truncated cone with a hydrophobic cavity. The adducts of CD with metal complexes remain scantily explored. In this study, the stability constants of the adducts between succinate copper(II) complexes and β‐CD was determined using capillary electrophoresis. The β‐CD concentration in background electrolytes (BGE) was found to influence on the effective electrophoretic mobility of the copper(II) complexes in succinate BGEs. It was shown that succinic acid and its anions and copper(II) ions did not form a significant amount of the inclusion complexes with β‐CD and the mobility change was caused by the adduct formation between succinate copper(II) complexes and β‐CD. The stability constants of these adducts were determined at 25°С and ionic strength of 0.100 M: log β (CuL 2 2− /β‐CD) = 1.76 ± 0.06, log β (CuL 0 /β‐CD) = 0.98 ± 0.09. The [CuHL] + and [CuHL 2 ] − species were found to do not form adducts with β‐CD.