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Spectrophotometric Determination of the Stability Constants of Co(II) and DPKBH (Di-2-Pyridyl Ketone Benzoylhydrazone)

Rossi, M. V. and Suárez-Iha, M. E. V. and Hoffmann, M. R. (1995) Spectrophotometric Determination of the Stability Constants of Co(II) and DPKBH (Di-2-Pyridyl Ketone Benzoylhydrazone). Spectroscopy Letters, 28 (8). pp. 1153-1166. ISSN 0038-7010. https://resolver.caltech.edu/CaltechAUTHORS:20150810-152946428

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Abstract

In order to have more information about the thermodynamic properties of the complexes formed by Cobalt(II) and DPKBH (di-2-pyridyl ketone benzoylhydrazone) and for the development of speciation methods for cobalt, the respective stepwise formation constants were determined in ethanolic solution 50% (V/V), at pH 5.3 and 25.0°C. The spectrophotometric method of corresponding solutions was used and the following overall formation constants were obtained: β_1 = 5.305 × 10^6 M^(−1) and β_2 = 8.476 × 10^(10) M^(−2). The molar absorptivities of the 1:1 (ε_1) and 1:2 (ε_2) complexes (Co(II):DPKBH) were determined to be 4.475 × 10^3 and 2.994 × 10^4 (M^(−1)cm^(−1)), respectively. The calculated distribution diagram shows the percentage of the species at equilibrium as a function of the free DPKBH concentration.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org//10.1080/00387019508009454DOIArticle
http://www.tandfonline.com/doi/abs/10.1080/00387019508009454PublisherArticle
ORCID:
AuthorORCID
Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 1995 by Marcel Dekker, Inc. Date Received: May 25, 1995, Date Accepted : July 5, 1995. M. E. V. Suárez-Iha is grateful to the Fundação de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) for the financial support. We are also grateful to the NSF (ATM 9Q15775) for providing the financial resources for this project.
Funders:
Funding AgencyGrant Number
Fundação de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)UNSPECIFIED
NSFATM 9Q15775
Issue or Number:8
Record Number:CaltechAUTHORS:20150810-152946428
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150810-152946428
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59369
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Aug 2015 16:10
Last Modified:03 Mar 2020 13:01

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