The complexation reactions between octaazamacrocyclic ligand N,N',N '',N'"-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) and Co2+, Ni2+, Zn2+ and Cu2+ metal cations have been studied conductometrically in acetonitrile and aqueous solutions. The conductance data exhibit different stoichiometry of the complexes in two studied solutions. In most cases 1:1 (ML) complexes were formed while in some cases 2:1 (M2L) complexes are evident. The stability constants of the resulting 1:1 complexes were determined by computer fitting of the conductance/mole ratio data. Theoretical DFT calculations were used to explain metal binding capability of tpmc ligand and the binding sequences were found to follow the order: Cu2+ gt gt Ni2+ gt Co2+ gt Zn2+. The combination of results obtained by this theoretical approach and conductometric study successfully explains sensitivity and selectivity of recently developed tpmc based ISE and could play a guiding role in planning experiment...s with large macrocyclic ligands.
Keywords:
N,N ',N '',N '''-Tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) / Co2+, Ni2+, Zn2+ and Cu2+ ions / Binding energy / Conductometry / Conformations
TY - JOUR
AU - Petković, Branka B.
AU - Milčić, Miloš K.
AU - Stanković, Dalibor
AU - Stambolić, I.
AU - Manojlović, Dragan D.
AU - Jovanović, V. M.
AU - Sovilj, Sofija P.
PY - 2013
UR - http://cherry.chem.bg.ac.rs/handle/123456789/1607
AB - The complexation reactions between octaazamacrocyclic ligand N,N',N '',N'"-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) and Co2+, Ni2+, Zn2+ and Cu2+ metal cations have been studied conductometrically in acetonitrile and aqueous solutions. The conductance data exhibit different stoichiometry of the complexes in two studied solutions. In most cases 1:1 (ML) complexes were formed while in some cases 2:1 (M2L) complexes are evident. The stability constants of the resulting 1:1 complexes were determined by computer fitting of the conductance/mole ratio data. Theoretical DFT calculations were used to explain metal binding capability of tpmc ligand and the binding sequences were found to follow the order: Cu2+ gt gt Ni2+ gt Co2+ gt Zn2+. The combination of results obtained by this theoretical approach and conductometric study successfully explains sensitivity and selectivity of recently developed tpmc based ISE and could play a guiding role in planning experiments with large macrocyclic ligands.
PB - Pergamon-Elsevier Science Ltd, Oxford
T2 - Electrochimica Acta
T1 - Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study
VL - 89
SP - 680
EP - 687
DO - 10.1016/j.electacta.2012.11.100
ER -
@article{
author = "Petković, Branka B. and Milčić, Miloš K. and Stanković, Dalibor and Stambolić, I. and Manojlović, Dragan D. and Jovanović, V. M. and Sovilj, Sofija P.",
year = "2013",
url = "http://cherry.chem.bg.ac.rs/handle/123456789/1607",
abstract = "The complexation reactions between octaazamacrocyclic ligand N,N',N '',N'"-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) and Co2+, Ni2+, Zn2+ and Cu2+ metal cations have been studied conductometrically in acetonitrile and aqueous solutions. The conductance data exhibit different stoichiometry of the complexes in two studied solutions. In most cases 1:1 (ML) complexes were formed while in some cases 2:1 (M2L) complexes are evident. The stability constants of the resulting 1:1 complexes were determined by computer fitting of the conductance/mole ratio data. Theoretical DFT calculations were used to explain metal binding capability of tpmc ligand and the binding sequences were found to follow the order: Cu2+ gt gt Ni2+ gt Co2+ gt Zn2+. The combination of results obtained by this theoretical approach and conductometric study successfully explains sensitivity and selectivity of recently developed tpmc based ISE and could play a guiding role in planning experiments with large macrocyclic ligands.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Electrochimica Acta",
title = "Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study",
volume = "89",
pages = "680-687",
doi = "10.1016/j.electacta.2012.11.100"
}
Petković BB, Milčić MK, Stanković D, Stambolić I, Manojlović DD, Jovanović VM, Sovilj SP. Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study. Electrochimica Acta. 2013;89:680-687
Petković, B. B., Milčić, M. K., Stanković, D., Stambolić, I., Manojlović, D. D., Jovanović, V. M.,& Sovilj, S. P. (2013). Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study.
Electrochimica ActaPergamon-Elsevier Science Ltd, Oxford., 89, 680-687.
https://doi.org/10.1016/j.electacta.2012.11.100
Petković Branka B., Milčić Miloš K., Stanković Dalibor, Stambolić I., Manojlović Dragan D., Jovanović V. M., Sovilj Sofija P., "Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study" 89 (2013):680-687,
https://doi.org/10.1016/j.electacta.2012.11.100 .
