Complexation ability of octaazamacrocyclic ligand toward Co2+, Ni2+, Cu2+ and Zn2+ metal cations: Experimental and theoretical study
| Autor: | Sofija P. Sovilj, Vladislava M. Jovanović, Dalibor M. Stanković, Ivan Stambolic, Branka Petković, Dragan Manojlović, Miloš Milčić |
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| Rok vydání: | 2013 |
| Předmět: |
Conductometry
General Chemical Engineering Binding energy Inorganic chemistry 010402 general chemistry 01 natural sciences Co2+ Ni2+ Zn2+ and Cu2+ ions Metal chemistry.chemical_compound Electrochemistry Acetonitrile Aqueous solution 010405 organic chemistry Chemistry Ligand Zn2+ ions Cu2+ ions Conductance 0104 chemical sciences Conformations Crystallography visual_art Co2+ ions visual_art.visual_art_medium N N ' N '' N '''-Tetrakis(2-pyridylmethyl)-1 4 8 11-tetraazacyclotetradecane (tpmc) Ni2+ ions Selectivity |
| Zdroj: | Electrochimica Acta |
| ISSN: | 0013-4686 |
| Popis: | 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. Supplementary material: [http://cherry.chem.bg.ac.rs/handle/123456789/3473] |
| Databáze: | OpenAIRE |
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