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Stability, Stoichiometry, and Structure of Fe(II) and Fe(III) Complexes with Di-2-pyridyl Ketone Benzoylhydrazone: Environmental Applications

Suárez Iha, Maria E. V. and Pehkonen, Simo O. and Hoffmann, Michael R. (1994) Stability, Stoichiometry, and Structure of Fe(II) and Fe(III) Complexes with Di-2-pyridyl Ketone Benzoylhydrazone: Environmental Applications. Environmental Science and Technology, 28 (12). pp. 2080-2086. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150810-083413666

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Abstract

The stoichiometry, structure, and thermodynamics of Fe-(II) and Fe(III) complexes of di-2-pyridyl ketone benzoylhydrazone (DPKBH) were studied at pH 5.3 and 25.0 °C in water-ethanol solutions. The spectrophotometric method of corresponding solutions was used to obtain overall formation constants for the 1:1 (β_1 = 4.693 X 10^6 M^(-1)) and 1:2 (β_2 = 2.195 X 10^(10) M^(-2)) Fe(III)(H_20)_6^(3+)DPKBH complexes and 1:1(β_1 =1.217 X 10^5 M^(-1)) and 1:2 (β_2 = 7.814 X 10^9 M^(-2)) Fe(II)(H_2O)_6^(2+)-PKBH complexes. Conductance and pH titrations indicate that DPKBH coordinates preferentially as an anion, while FTIR analysis shows that DPKBH exists in the enol form and exhibits tridentate ligand behavior. DPKBH has been shown to be a useful analytical reagent for the simultaneous spectrophotometric determination of Fe(II) and Fe(III) in natural waters: Fe(H_20)_6^(3+) + DPKBH ⇆ Fe(H_2O_)_3- (DPKBH)^(3+) + 3H_2O and Fe(H_2O)_6^(3+) + 2DPKBH ⇆ Fe-(DPKBH)_2^(3+) + 6H_2O.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es00061a016DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es00061a016PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1994 American Chemical Society. Received for review January 12, 1994. Revised manuscript received June 28, 1994. Accepted July 28, 1994. M.E.V.S.I. is grateful to the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for the financial support. We are also grateful to the NSF (ATM 9015775) for providing the financial resources for this project.
Funders:
Funding AgencyGrant Number
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)UNSPECIFIED
NSFATM 9015775
Issue or Number:12
Record Number:CaltechAUTHORS:20150810-083413666
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150810-083413666
Official Citation:Stability, Stoichiometry, and Structure of Fe(II) and Fe(III) Complexes with Di-2-pyridyl Ketone Benzoylhydrazone: Environmental Applications Maria E. V. Suarez Iha, Simo O. Pehkonen, and Michael R. Hoffmann Environmental Science & Technology 1994 28 (12), 2080-2086 DOI: 10.1021/es00061a016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59340
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:10 Aug 2015 21:39
Last Modified:03 Mar 2020 13:01

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