Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid

Kayode Taiwo Ishola; Mary Adelaide Oladipo; Omobola Ajibike Odedokun; Oladapo Tunde Olanipekun

doi:doi:10.11648/j.ajac.20200801.14

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Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid

Kayode Taiwo Ishola, Mary Adelaide Oladipo, Omobola Ajibike Odedokun, Oladapo Tunde Olanipekun

Published in American Journal of Applied Chemistry (Volume 8, Issue 1)

Received: 29 February 2020 Accepted: 19 March 2020 Published: 13 April 2020

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Abstract

Several chelating agents have been widely used as scavengers to transport metals to or away from vulnerable sites due to their ability to form stable complexes with different metal ions. Many of the chelating agents have been reported to be toxic, non-biodegradable and inflexible for the recovery of bound metal ions. The inherent drawbacks with these chelating agents necessitate a search for their replacement. Therefore, the extent of coordination of L-tyrosine, L-histidine (secondary ligands) and Thiobarbituric acid (primary ligand) with Co(II), Cu(II) and Pb(II) in an aqueous medium at 27°C and 35°C has been examined potentiometrically with ionic strength maintained by 0.02M NaNO₃. The potentiometric equilibrium measurements showed that the ligands formed binary and ternary complexes with the metal ions. Ternary complexes were formed by simultaneous mechanisms and they were found to be more stable than the corresponding binary complexes. The order of stability was found to increase with an increase in the covalent index of the metal ions and decrease with increase in temperature. Speciation diagram showed the variation in stability constants of the binary and ternary complexes as the function of pH. The ligands exhibited high coordinating properties and could be used as metal scavengers for transportation of metals to or away from vulnerable sites. The binary metal complexes could be applied as a medium of transporting chemotherapeutic drugs to target sites or detoxifying poisonous substances which possesses donor atoms with chelating capability.

Published in	American Journal of Applied Chemistry (Volume 8, Issue 1)
DOI	10.11648/j.ajac.20200801.14
Page(s)	23-30
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Binary Complexes, Potentiometric, Speciation, Stability Constants, Ternary Complexes

References

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Kayode Taiwo Ishola, Mary Adelaide Oladipo, Omobola Ajibike Odedokun, Oladapo Tunde Olanipekun. (2020). Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. American Journal of Applied Chemistry, 8(1), 23-30. https://doi.org/10.11648/j.ajac.20200801.14

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ACS Style

Kayode Taiwo Ishola; Mary Adelaide Oladipo; Omobola Ajibike Odedokun; Oladapo Tunde Olanipekun. Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. Am. J. Appl. Chem. 2020, 8(1), 23-30. doi: 10.11648/j.ajac.20200801.14

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AMA Style

Kayode Taiwo Ishola, Mary Adelaide Oladipo, Omobola Ajibike Odedokun, Oladapo Tunde Olanipekun. Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. Am J Appl Chem. 2020;8(1):23-30. doi: 10.11648/j.ajac.20200801.14

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@article{10.11648/j.ajac.20200801.14,
  author = {Kayode Taiwo Ishola and Mary Adelaide Oladipo and Omobola Ajibike Odedokun and Oladapo Tunde Olanipekun},
  title = {Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid},
  journal = {American Journal of Applied Chemistry},
  volume = {8},
  number = {1},
  pages = {23-30},
  doi = {10.11648/j.ajac.20200801.14},
  url = {https://doi.org/10.11648/j.ajac.20200801.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajac.20200801.14},
  abstract = {Several chelating agents have been widely used as scavengers to transport metals to or away from vulnerable sites due to their ability to form stable complexes with different metal ions. Many of the chelating agents have been reported to be toxic, non-biodegradable and inflexible for the recovery of bound metal ions. The inherent drawbacks with these chelating agents necessitate a search for their replacement. Therefore, the extent of coordination of L-tyrosine, L-histidine (secondary ligands) and Thiobarbituric acid (primary ligand) with Co(II), Cu(II) and Pb(II) in an aqueous medium at 27°C and 35°C has been examined potentiometrically with ionic strength maintained by 0.02M NaNO3. The potentiometric equilibrium measurements showed that the ligands formed binary and ternary complexes with the metal ions. Ternary complexes were formed by simultaneous mechanisms and they were found to be more stable than the corresponding binary complexes. The order of stability was found to increase with an increase in the covalent index of the metal ions and decrease with increase in temperature. Speciation diagram showed the variation in stability constants of the binary and ternary complexes as the function of pH. The ligands exhibited high coordinating properties and could be used as metal scavengers for transportation of metals to or away from vulnerable sites. The binary metal complexes could be applied as a medium of transporting chemotherapeutic drugs to target sites or detoxifying poisonous substances which possesses donor atoms with chelating capability.},
 year = {2020}
}

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TY  - JOUR
T1  - Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid
AU  - Kayode Taiwo Ishola
AU  - Mary Adelaide Oladipo
AU  - Omobola Ajibike Odedokun
AU  - Oladapo Tunde Olanipekun
Y1  - 2020/04/13
PY  - 2020
N1  - https://doi.org/10.11648/j.ajac.20200801.14
DO  - 10.11648/j.ajac.20200801.14
T2  - American Journal of Applied Chemistry
JF  - American Journal of Applied Chemistry
JO  - American Journal of Applied Chemistry
SP  - 23
EP  - 30
PB  - Science Publishing Group
SN  - 2330-8745
UR  - https://doi.org/10.11648/j.ajac.20200801.14
AB  - Several chelating agents have been widely used as scavengers to transport metals to or away from vulnerable sites due to their ability to form stable complexes with different metal ions. Many of the chelating agents have been reported to be toxic, non-biodegradable and inflexible for the recovery of bound metal ions. The inherent drawbacks with these chelating agents necessitate a search for their replacement. Therefore, the extent of coordination of L-tyrosine, L-histidine (secondary ligands) and Thiobarbituric acid (primary ligand) with Co(II), Cu(II) and Pb(II) in an aqueous medium at 27°C and 35°C has been examined potentiometrically with ionic strength maintained by 0.02M NaNO3. The potentiometric equilibrium measurements showed that the ligands formed binary and ternary complexes with the metal ions. Ternary complexes were formed by simultaneous mechanisms and they were found to be more stable than the corresponding binary complexes. The order of stability was found to increase with an increase in the covalent index of the metal ions and decrease with increase in temperature. Speciation diagram showed the variation in stability constants of the binary and ternary complexes as the function of pH. The ligands exhibited high coordinating properties and could be used as metal scavengers for transportation of metals to or away from vulnerable sites. The binary metal complexes could be applied as a medium of transporting chemotherapeutic drugs to target sites or detoxifying poisonous substances which possesses donor atoms with chelating capability.
VL  - 8
IS  - 1
ER  -

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Author Information

Kayode Taiwo Ishola

Department of Chemistry, Federal College of Education, (Special), Oyo, Nigeria
Mary Adelaide Oladipo

Department of Chemistry, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
Omobola Ajibike Odedokun

Department of Chemistry, Federal College of Education, (Special), Oyo, Nigeria
Oladapo Tunde Olanipekun

Department of Chemistry, Federal College of Education, (Special), Oyo, Nigeria

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APA Style

Kayode Taiwo Ishola, Mary Adelaide Oladipo, Omobola Ajibike Odedokun, Oladapo Tunde Olanipekun. (2020). Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. American Journal of Applied Chemistry, 8(1), 23-30. https://doi.org/10.11648/j.ajac.20200801.14

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ACS Style

Kayode Taiwo Ishola; Mary Adelaide Oladipo; Omobola Ajibike Odedokun; Oladapo Tunde Olanipekun. Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. Am. J. Appl. Chem. 2020, 8(1), 23-30. doi: 10.11648/j.ajac.20200801.14

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AMA Style

Kayode Taiwo Ishola, Mary Adelaide Oladipo, Omobola Ajibike Odedokun, Oladapo Tunde Olanipekun. Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid. Am J Appl Chem. 2020;8(1):23-30. doi: 10.11648/j.ajac.20200801.14

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@article{10.11648/j.ajac.20200801.14,
  author = {Kayode Taiwo Ishola and Mary Adelaide Oladipo and Omobola Ajibike Odedokun and Oladapo Tunde Olanipekun},
  title = {Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid},
  journal = {American Journal of Applied Chemistry},
  volume = {8},
  number = {1},
  pages = {23-30},
  doi = {10.11648/j.ajac.20200801.14},
  url = {https://doi.org/10.11648/j.ajac.20200801.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajac.20200801.14},
  abstract = {Several chelating agents have been widely used as scavengers to transport metals to or away from vulnerable sites due to their ability to form stable complexes with different metal ions. Many of the chelating agents have been reported to be toxic, non-biodegradable and inflexible for the recovery of bound metal ions. The inherent drawbacks with these chelating agents necessitate a search for their replacement. Therefore, the extent of coordination of L-tyrosine, L-histidine (secondary ligands) and Thiobarbituric acid (primary ligand) with Co(II), Cu(II) and Pb(II) in an aqueous medium at 27°C and 35°C has been examined potentiometrically with ionic strength maintained by 0.02M NaNO3. The potentiometric equilibrium measurements showed that the ligands formed binary and ternary complexes with the metal ions. Ternary complexes were formed by simultaneous mechanisms and they were found to be more stable than the corresponding binary complexes. The order of stability was found to increase with an increase in the covalent index of the metal ions and decrease with increase in temperature. Speciation diagram showed the variation in stability constants of the binary and ternary complexes as the function of pH. The ligands exhibited high coordinating properties and could be used as metal scavengers for transportation of metals to or away from vulnerable sites. The binary metal complexes could be applied as a medium of transporting chemotherapeutic drugs to target sites or detoxifying poisonous substances which possesses donor atoms with chelating capability.},
 year = {2020}
}

Copy | Download

TY  - JOUR
T1  - Potentiometric Studies of Stability Constants and Speciation of Binary and Ternary Complexes of Metal (II) Ions with Amino Acids and Thiobarbituric Acid
AU  - Kayode Taiwo Ishola
AU  - Mary Adelaide Oladipo
AU  - Omobola Ajibike Odedokun
AU  - Oladapo Tunde Olanipekun
Y1  - 2020/04/13
PY  - 2020
N1  - https://doi.org/10.11648/j.ajac.20200801.14
DO  - 10.11648/j.ajac.20200801.14
T2  - American Journal of Applied Chemistry
JF  - American Journal of Applied Chemistry
JO  - American Journal of Applied Chemistry
SP  - 23
EP  - 30
PB  - Science Publishing Group
SN  - 2330-8745
UR  - https://doi.org/10.11648/j.ajac.20200801.14
AB  - Several chelating agents have been widely used as scavengers to transport metals to or away from vulnerable sites due to their ability to form stable complexes with different metal ions. Many of the chelating agents have been reported to be toxic, non-biodegradable and inflexible for the recovery of bound metal ions. The inherent drawbacks with these chelating agents necessitate a search for their replacement. Therefore, the extent of coordination of L-tyrosine, L-histidine (secondary ligands) and Thiobarbituric acid (primary ligand) with Co(II), Cu(II) and Pb(II) in an aqueous medium at 27°C and 35°C has been examined potentiometrically with ionic strength maintained by 0.02M NaNO3. The potentiometric equilibrium measurements showed that the ligands formed binary and ternary complexes with the metal ions. Ternary complexes were formed by simultaneous mechanisms and they were found to be more stable than the corresponding binary complexes. The order of stability was found to increase with an increase in the covalent index of the metal ions and decrease with increase in temperature. Speciation diagram showed the variation in stability constants of the binary and ternary complexes as the function of pH. The ligands exhibited high coordinating properties and could be used as metal scavengers for transportation of metals to or away from vulnerable sites. The binary metal complexes could be applied as a medium of transporting chemotherapeutic drugs to target sites or detoxifying poisonous substances which possesses donor atoms with chelating capability.
VL  - 8
IS  - 1
ER  -

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