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Harriswangler C, Lucio-Martínez F, Rodríguez-Rodríguez A, Esteban-Gómez D, Platas-Iglesias C. Unravelling the 6sp ← 6s absorption spectra of Bi(III) complexes. Dalton Trans 2024; 53:2275-2285. [PMID: 38197124 DOI: 10.1039/d3dt03744d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
We report a spectroscopic and computational study that investigates the absorption spectra of Bi(III) complexes, which often show an absorption band in the UV region (∼270-350 nm) due to 6sp ← 6s transitions. We investigated the spectra of three simple complexes, [BiCl5]2-, [BiCl6]3- and [Bi(DMSO)8]3+, which show absorption maxima at 334, 326 and 279 nm due to 3P1 ← 1S0 transitions. Theoretical calculations based on quasi-degenerate N-electron valence perturbation theory to second order (QD-NEVPT2) provide an accurate description of the absorption spectra when employing CAS(2,9) wave functions. We next investigated the absorption spectra of the [Bi(NOTA)] complex (H3NOTA = 1,4,7-triazacyclononane-1,4,7-triacetic acid), which forms ternary complexes [Bi(NOTA)X]- (X = Cl, Br or I) in the presence of excess halide in aqueous solutions. Halide binding has an important impact on the position of the 3P1 ← 1S0 transition, which shifts progressively to longer wavelengths from 282 nm ([Bi(NOTA)]) to 298 nm (X = Cl), 305 nm (X = Br) and 325 nm (X = I). Subsequent QD-NEVPT2 calculations indicate that this effect is related to the progressive stabilization of the spin-orbit free states associated with the 6s16p1 configuration on increasing the covalent character of the metal-ligand(s) bonds, rather than with significant differences in spin-orbit coupling (SOC). These studies provide valuable insight into the coordination chemistry of Bi(III), an ion with increasing interest in targeted alpha therapy due to the possible application of bismuth isotopes bismuth-212 (212Bi, t1/2 = 60.6 min) and bismuth-213 (213Bi, t1/2 = 45.6 min).
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Affiliation(s)
- Charlene Harriswangler
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Fátima Lucio-Martínez
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Aurora Rodríguez-Rodríguez
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - David Esteban-Gómez
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
| | - Carlos Platas-Iglesias
- Universidade da Coruña, Centro de Interdisciplinar de Química e Bioloxía (CICA) and Departamento de Química, Facultade de Ciencias, 15071, A Coruña, Galicia, Spain.
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Zubenko AD, Shchukina AA, Chernikova EY, Egorova BV, Ikonnikova IS, Priselkova AB, Larenkov AA, Bubenshchikov VB, Mitrofanov AA, Fedorov YV, Fedorova OA. Synthesis of new acyclic chelators H4aPyta and H6aPyha and their complexes with Cu 2+, Ga 3+, Y 3+, and Bi 3. Dalton Trans 2024; 53:1141-1155. [PMID: 38105658 DOI: 10.1039/d3dt03451h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
In this article, we present the synthesis and characterization of new acyclic pyridine-containing polyaminocarboxylate ligands H4aPyta and H6aPyha, which differ in structural rigidity and the number of chelating groups. Their abilities to form complexes with Cu2+, Ga3+, Y3+, and Bi3+ cations, as well as the stability of the complexes, were evaluated by potentiometric titration method, radiolabeling with the corresponding radionuclides, in vitro studies, mass spectrometry, and HPLC. The structures of the resulting complexes were determined using NMR spectroscopy and DFT calculations. The results obtained made it possible to evaluate the influence of the structural features of the complexes on their stability. The developed chelators H4aPyta and H6aPyha were proved to be promising for further research in the field of radiopharmaceuticals.
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Affiliation(s)
- Anastasia D Zubenko
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991 St. Vavilova, 28, GSP-1, Moscow, Russian Federation.
| | - Anna A Shchukina
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991 St. Vavilova, 28, GSP-1, Moscow, Russian Federation.
| | - Ekaterina Y Chernikova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991 St. Vavilova, 28, GSP-1, Moscow, Russian Federation.
| | - Bayirta V Egorova
- Lomonosov Moscow State University, 119991 Leninskie Gory, 1/3, Moscow, Russian Federation
| | - Irina S Ikonnikova
- Lomonosov Moscow State University, 119991 Leninskie Gory, 1/3, Moscow, Russian Federation
| | - Anna B Priselkova
- Lomonosov Moscow State University, 119991 Leninskie Gory, 1/3, Moscow, Russian Federation
| | - Anton A Larenkov
- State Research Center-Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, Zhivopisnaya Str., Bld. 46, 123098 Moscow, Russian Federation
| | - Viktor B Bubenshchikov
- State Research Center-Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, Zhivopisnaya Str., Bld. 46, 123098 Moscow, Russian Federation
| | - Artem A Mitrofanov
- Lomonosov Moscow State University, 119991 Leninskie Gory, 1/3, Moscow, Russian Federation
| | - Yury V Fedorov
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991 St. Vavilova, 28, GSP-1, Moscow, Russian Federation.
| | - Olga A Fedorova
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, 119991 St. Vavilova, 28, GSP-1, Moscow, Russian Federation.
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