Estimating the Individual Spectroscopic Properties of Three Unique EuIII Sites in a Coordination Polymer
| Autor: | André Luiz Barboza Formiga, Fernando Aparecido Sigoli, José Diogo L. Dutra, Jorge H. S. K. Monteiro, Italo Odone Mazali, Ana de Bettencourt-Dias, Riicardo O. Freire |
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| Rok vydání: | 2018 |
| Předmět: |
010405 organic chemistry
Coordination polymer Ligand Triclinic crystal system 010402 general chemistry 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Dimethylformamide Molecule Physical and Theoretical Chemistry Spectroscopy Excitation |
| Zdroj: | Inorganic Chemistry. 57:15421-15429 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | We isolated a coordination polymer with the formula [Eu3(3,5-dcba)9(H2O)(dmf)3]·2dmf, with three unique EuIII coordination sites in the asymmetric unit, with the EuIII ions bridged by 3,5-dichlorobenzoato (3,5-dcba) ligands. The coordination polymer crystallized in the triclinic space group P1 with unit cell dimensions a = 12.4899(15), b = 16.326(2), and c = 25.059(3) A, α = 84.271(3)°, β = 84.832(3)°, and γ = 68.585(3)° and V = 4725.2(10) A3. The characteristic 5D0 → 7FJ (J = 0–4) EuIII transitions were observed upon ligand-centered excitation. Emission lifetimes of 0.825 ± 0.085 and 1.586 ± 0.057 ms were observed and were attributed to the sites with coordination of water or dimethylformamide (dmf) molecules to each ion, respectively. Through a combination of spectroscopy and calculations, we determined the photophysical properties of each unique EuIII site. Energy-transfer rates ligand → EuIII were determined for each unique site using the overlapped polyhedra method. The rates depend on the coordinat... |
| Databáze: | OpenAIRE |
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