Stability constant studies on a new selective chelating agent for mercury(II)

Mark M. Jones; Alton J. Banks; C. Hendricks Brown

doi:10.1016/0022-1902(74)80519-1

Stability constant studies on a new selective chelating agent for mercury(II)

Mark M. Jones, Alton J. Banks, C. Hendricks Brown

Epidemiology & Public Health-Med

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

A new chelating agent, phthalytetrathioacetic acid, (PTTA), has been characterized and found to be highly selective for Hg²⁺. All four of its ionization constants have been determined and the stability constants of its complexes with Hg²⁺, Ca²⁺, Zn²⁺, Co²⁺, Pb²⁺, Ni²⁺, and Cd²⁺ estimated. The mercury complex has a stability constant greater than those of the other complexes by a factor of at least 10¹⁰. The high selectivity for the Hg²⁺ ion is due to a closely spaced group of thioether sulfurs and a rather wide separation of the carboxylic acid groups which are potential members of chelate rings. The mercury complexes present in aqueous solution are Hg(PTTA)H₂, log K = 18·8 at low pH and Hg(PTTA) (OH)₂, log K = 45 at high pH. The presence of thioether, rather than thiol sulfur atoms has the result that the chelate with Pb²⁺ is of low stability.

Original language	English (US)
Pages (from-to)	1833-1836
Number of pages	4
Journal	Journal of Inorganic and Nuclear Chemistry
Volume	36
Issue number	8
DOIs	https://doi.org/10.1016/0022-1902(74)80519-1
State	Published - Aug 1974

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@article{eb6f4676701b4b76b2ff3e913902a56e,

title = "Stability constant studies on a new selective chelating agent for mercury(II)",

abstract = "A new chelating agent, phthalytetrathioacetic acid, (PTTA), has been characterized and found to be highly selective for Hg2+. All four of its ionization constants have been determined and the stability constants of its complexes with Hg2+, Ca2+, Zn2+, Co2+, Pb2+, Ni2+, and Cd2+ estimated. The mercury complex has a stability constant greater than those of the other complexes by a factor of at least 1010. The high selectivity for the Hg2+ ion is due to a closely spaced group of thioether sulfurs and a rather wide separation of the carboxylic acid groups which are potential members of chelate rings. The mercury complexes present in aqueous solution are Hg(PTTA)H2, log K = 18·8 at low pH and Hg(PTTA) (OH)2, log K = 45 at high pH. The presence of thioether, rather than thiol sulfur atoms has the result that the chelate with Pb2+ is of low stability.",

author = "Jones, {Mark M.} and Banks, {Alton J.} and {Hendricks Brown}, C.",

note = "Funding Information: Ackmm'ledgement This work was performed Under the auspices of the Center of Toxicology, Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37235, and supported by the United States Public Health Services Center Grant ES00267.",

year = "1974",

month = aug,

doi = "10.1016/0022-1902(74)80519-1",

language = "English (US)",

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pages = "1833--1836",

journal = "Polyhedron",

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T1 - Stability constant studies on a new selective chelating agent for mercury(II)

AU - Jones, Mark M.

AU - Banks, Alton J.

AU - Hendricks Brown, C.

N1 - Funding Information: Ackmm'ledgement This work was performed Under the auspices of the Center of Toxicology, Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37235, and supported by the United States Public Health Services Center Grant ES00267.

PY - 1974/8

Y1 - 1974/8

N2 - A new chelating agent, phthalytetrathioacetic acid, (PTTA), has been characterized and found to be highly selective for Hg2+. All four of its ionization constants have been determined and the stability constants of its complexes with Hg2+, Ca2+, Zn2+, Co2+, Pb2+, Ni2+, and Cd2+ estimated. The mercury complex has a stability constant greater than those of the other complexes by a factor of at least 1010. The high selectivity for the Hg2+ ion is due to a closely spaced group of thioether sulfurs and a rather wide separation of the carboxylic acid groups which are potential members of chelate rings. The mercury complexes present in aqueous solution are Hg(PTTA)H2, log K = 18·8 at low pH and Hg(PTTA) (OH)2, log K = 45 at high pH. The presence of thioether, rather than thiol sulfur atoms has the result that the chelate with Pb2+ is of low stability.

AB - A new chelating agent, phthalytetrathioacetic acid, (PTTA), has been characterized and found to be highly selective for Hg2+. All four of its ionization constants have been determined and the stability constants of its complexes with Hg2+, Ca2+, Zn2+, Co2+, Pb2+, Ni2+, and Cd2+ estimated. The mercury complex has a stability constant greater than those of the other complexes by a factor of at least 1010. The high selectivity for the Hg2+ ion is due to a closely spaced group of thioether sulfurs and a rather wide separation of the carboxylic acid groups which are potential members of chelate rings. The mercury complexes present in aqueous solution are Hg(PTTA)H2, log K = 18·8 at low pH and Hg(PTTA) (OH)2, log K = 45 at high pH. The presence of thioether, rather than thiol sulfur atoms has the result that the chelate with Pb2+ is of low stability.

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