title: Study of the reaction of complexation of penicillin V with cobalt(II) in methanolic medium.
abstract: As shown by spectrophotometry, two specific complexes with stoichiometry 1:1 and 2:1 are formed when penicillin V reacts with cobalt(II) in a methanolic medium. Stability constants are determined at 20 degrees , as well as the molar absorptivities at 510 nm. The results obtained are: log beta(1:1) = 1.67 +/- 0.01 l.mole(-1) and log beta(2:1) = 5.76 +/- 1.01 l(2).mole(-2), (1:1) = 13.62 +/- 0.73 and (2:1) = 12.95 +/- 0.61 l.mole(-1).cm(-1).
authors.affiliation: Department of Physical Chemistry, Faculty of Pharmacy, University of Granada, Granada, Spain.
authors.forename: J H
authors.initials: JH
authors.lastname: Martinez
authors.forename: P J
authors.initials: PJ
authors.lastname: Martinez
authors.forename: P
authors.initials: P
authors.lastname: Gutierrez
authors.forename: M I
authors.initials: MI
authors.lastname: Martinez