Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties
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2019
Authors
Pradhan, R.N.Hossain, S.M.
Lakma, A.
Stojkov, D.D.
Verbić, Tatjana
Angelovski, G.
Pujales-Paradela, R.
Platas-Iglesias, C.
Singh, A.K.
Article (Published version)
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Two macrocyclic triamide octadentate chelator scaffolds L1 and L2 were synthesized, characterized by several spectroscopic techniques, and their pKa values were determined by potentiometric titration. Using these ligands, two water soluble paramagnetic Eu(III) complexes, [EuL1(OH2)](NO3)3·H2O (EuL1) and [EuL2(OH2)](NO3)3·H2O (EuL2) were synthesized and characterized in the solid state and in solution. Single crystal X ray diffraction measurement of [EuL1(OH2)](NO3)3.H2O (EuL1) reveals octadentate binding of the ligand to Eu(III) and ninth coordination being completed by an oxygen atom of a solvent molecule (H2O). X-ray diffraction data of [EuL2(OH2)](NO3)3·H2O (EuL2) were severely disordered and hence its chloride analogue [EuL2(DMF)]Cl3·H2OMeOH (EuL2-Cl) was synthesized and characterized using single-crystal X-ray diffraction measurements. The crystal data of [EuL2(DMF)](Cl)3·H2OMeOH (EuL2-Cl) reveal octadentate binding of the ligand to Eu(III), with the ninth coordination being compl...eted by an oxygen atom of a solvent molecule (DMF). Luminescence measurements confirm the presence of a water molecule coordinated to Eu(III) in aqueous solution. The stability of the Eu(III) complexes was investigated using spectrophotometric molar ratio method. Cyclic voltammetry studies obtained from aqueous solutions of the Eu(III) complexes show reversible one electron reduction processes at the glassy carbon electrode with E1/2 = −0.799 V and −0.777 V (versus Ag/AgCl) for the complexes of L1 and L2. © 2018 Elsevier B.V.
Keywords:
DFT calculation / Eu(III) macrocyclic complexes / Luminescence / pKa & stability constant / Redox properties / X-RaySource:
Inorganica Chimica Acta, 2019, 486, 252-260Funding / projects:
- Rational design and synthesis of biologically active and coordination compounds and functional materials, relevant for (bio)nanotechnology (RS-MESTD-Basic Research (BR or ON)-172035)
DOI: 10.1016/j.ica.2018.10.050
ISSN: 0020-1693
WoS: 000454151300033
Scopus: 2-s2.0-85055901372
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Hemijski fakultet / Faculty of ChemistryTY - JOUR AU - Pradhan, R.N. AU - Hossain, S.M. AU - Lakma, A. AU - Stojkov, D.D. AU - Verbić, Tatjana AU - Angelovski, G. AU - Pujales-Paradela, R. AU - Platas-Iglesias, C. AU - Singh, A.K. PY - 2019 UR - https://cherry.chem.bg.ac.rs/handle/123456789/359 AB - Two macrocyclic triamide octadentate chelator scaffolds L1 and L2 were synthesized, characterized by several spectroscopic techniques, and their pKa values were determined by potentiometric titration. Using these ligands, two water soluble paramagnetic Eu(III) complexes, [EuL1(OH2)](NO3)3·H2O (EuL1) and [EuL2(OH2)](NO3)3·H2O (EuL2) were synthesized and characterized in the solid state and in solution. Single crystal X ray diffraction measurement of [EuL1(OH2)](NO3)3.H2O (EuL1) reveals octadentate binding of the ligand to Eu(III) and ninth coordination being completed by an oxygen atom of a solvent molecule (H2O). X-ray diffraction data of [EuL2(OH2)](NO3)3·H2O (EuL2) were severely disordered and hence its chloride analogue [EuL2(DMF)]Cl3·H2OMeOH (EuL2-Cl) was synthesized and characterized using single-crystal X-ray diffraction measurements. The crystal data of [EuL2(DMF)](Cl)3·H2OMeOH (EuL2-Cl) reveal octadentate binding of the ligand to Eu(III), with the ninth coordination being completed by an oxygen atom of a solvent molecule (DMF). Luminescence measurements confirm the presence of a water molecule coordinated to Eu(III) in aqueous solution. The stability of the Eu(III) complexes was investigated using spectrophotometric molar ratio method. Cyclic voltammetry studies obtained from aqueous solutions of the Eu(III) complexes show reversible one electron reduction processes at the glassy carbon electrode with E1/2 = −0.799 V and −0.777 V (versus Ag/AgCl) for the complexes of L1 and L2. © 2018 Elsevier B.V. T2 - Inorganica Chimica Acta T1 - Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties VL - 486 SP - 252 EP - 260 DO - 10.1016/j.ica.2018.10.050 ER -
@article{ author = "Pradhan, R.N. and Hossain, S.M. and Lakma, A. and Stojkov, D.D. and Verbić, Tatjana and Angelovski, G. and Pujales-Paradela, R. and Platas-Iglesias, C. and Singh, A.K.", year = "2019", abstract = "Two macrocyclic triamide octadentate chelator scaffolds L1 and L2 were synthesized, characterized by several spectroscopic techniques, and their pKa values were determined by potentiometric titration. Using these ligands, two water soluble paramagnetic Eu(III) complexes, [EuL1(OH2)](NO3)3·H2O (EuL1) and [EuL2(OH2)](NO3)3·H2O (EuL2) were synthesized and characterized in the solid state and in solution. Single crystal X ray diffraction measurement of [EuL1(OH2)](NO3)3.H2O (EuL1) reveals octadentate binding of the ligand to Eu(III) and ninth coordination being completed by an oxygen atom of a solvent molecule (H2O). X-ray diffraction data of [EuL2(OH2)](NO3)3·H2O (EuL2) were severely disordered and hence its chloride analogue [EuL2(DMF)]Cl3·H2OMeOH (EuL2-Cl) was synthesized and characterized using single-crystal X-ray diffraction measurements. The crystal data of [EuL2(DMF)](Cl)3·H2OMeOH (EuL2-Cl) reveal octadentate binding of the ligand to Eu(III), with the ninth coordination being completed by an oxygen atom of a solvent molecule (DMF). Luminescence measurements confirm the presence of a water molecule coordinated to Eu(III) in aqueous solution. The stability of the Eu(III) complexes was investigated using spectrophotometric molar ratio method. Cyclic voltammetry studies obtained from aqueous solutions of the Eu(III) complexes show reversible one electron reduction processes at the glassy carbon electrode with E1/2 = −0.799 V and −0.777 V (versus Ag/AgCl) for the complexes of L1 and L2. © 2018 Elsevier B.V.", journal = "Inorganica Chimica Acta", title = "Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties", volume = "486", pages = "252-260", doi = "10.1016/j.ica.2018.10.050" }
Pradhan, R.N., Hossain, S.M., Lakma, A., Stojkov, D.D., Verbić, T., Angelovski, G., Pujales-Paradela, R., Platas-Iglesias, C.,& Singh, A.K.. (2019). Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties. in Inorganica Chimica Acta, 486, 252-260. https://doi.org/10.1016/j.ica.2018.10.050
Pradhan R, Hossain S, Lakma A, Stojkov D, Verbić T, Angelovski G, Pujales-Paradela R, Platas-Iglesias C, Singh A. Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties. in Inorganica Chimica Acta. 2019;486:252-260. doi:10.1016/j.ica.2018.10.050 .
Pradhan, R.N., Hossain, S.M., Lakma, A., Stojkov, D.D., Verbić, Tatjana, Angelovski, G., Pujales-Paradela, R., Platas-Iglesias, C., Singh, A.K., "Water soluble Eu(III) complexes of macrocyclic triamide ligands: Structure, stability, luminescence and redox properties" in Inorganica Chimica Acta, 486 (2019):252-260, https://doi.org/10.1016/j.ica.2018.10.050 . .