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)

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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
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 - Jan 1 1974

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Jones, M. M., Banks, A. J., & Hendricks Brown, C. (1974). Stability constant studies on a new selective chelating agent for mercury(II). Journal of Inorganic and Nuclear Chemistry, 36(8), 1833-1836. https://doi.org/10.1016/0022-1902(74)80519-1

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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.",

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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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10.1016/0022-1902(74)80519-1