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 | |
| State | Published - Jan 1 1974 |
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Stability constant studies on a new selective chelating agent for mercury(II). / Jones, Mark M.; Banks, Alton J.; Hendricks Brown, C.
In: Journal of Inorganic and Nuclear Chemistry, Vol. 36, No. 8, 01.01.1974, p. 1833-1836.Research output: Contribution to journal › Article
}
TY - JOUR
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.
PY - 1974/1/1
Y1 - 1974/1/1
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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U2 - 10.1016/0022-1902(74)80519-1
DO - 10.1016/0022-1902(74)80519-1
M3 - Article
AN - SCOPUS:0346215510
VL - 36
SP - 1833
EP - 1836
JO - Polyhedron
JF - Polyhedron
SN - 0277-5387
IS - 8
ER -