Structure of triaquatris(1,1,1-trifluoro-4-oxopentan-2-olato)cerium(III) as a possible fluorescent compound
| Autor: | Kenji Toda, Taoyun Zhu, Atsushi Itadani, Atsuya Koizumi, Takuya Hasegawa, Mineo Sato |
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| Rok vydání: | 2018 |
| Předmět: |
crystal structure
Denticity Quenching (fluorescence) 010405 organic chemistry Chemistry Hydrogen bond Coordination number chemistry.chemical_element General Chemistry Crystal structure 010402 general chemistry Condensed Matter Physics 01 natural sciences Research Communications 0104 chemical sciences Cerium Crystallography 1 1 1-trifluoroacetylacetone Atom cerium complex General Materials Science fluorescence Luminescence |
| Zdroj: | Acta Crystallographica Section E: Crystallographic Communications |
| ISSN: | 2056-9890 |
| DOI: | 10.1107/s2056989018001135 |
| Popis: | The title complex has two kinds of ligands, trifluoroacetylacetonate and water. As a result of the presence of F atoms in the 1,1,1-trifluoro-4-oxopentan-2-olate ligand, the metal–metal distance is longer than in the case of the analogous yttrium complex containing an acetylacetonato ligand and also for the analogous lanthanum complex containing acetylacetonate. Luminescence due to the d–f transition of Ce3+ is quite rare in metal–organic complexes where concentrate quenching frequently occurs. One of the possible ways to avoid this is to design an architecture with elongated metal–metal distances. In the structure of the title complex, triaquatris(1,1,1-trifluoro-4-oxopentan-2-olato-κ2 O,O′)cerium(III), [Ce(C5H4F3O2)3(H2O)3], the CeIII complex is linked to neighbouring ones by hydrogen bonding. Within the complex, the CeIII atom is coordinated by nine O atoms from three 1,1,1-trifluoro-4-oxopentan-2-olate (tfa) anions as bidentate ligands and three water molecules as monodentate ligands. Thus, the coordination number of CeIII atom is nine in a monocapped square–antiprismatic polyhedron. The F atoms of all three independent CF3 groups in tfa are disordered over two positions with occupancy ratios of about 0.8:0.2. The intermolecular hydrogen bonds between the ligands involve tfa–water interactions along the [110] and [1-10] directions, generating an overall two-dimensional layered network structure. The presence of the F atoms in the tfa anion is responsible for an increased intermolecular metal–metal distance compared to that in the analogous acetylacetonate (acac) derivatives. Fluorescence from Ce3+ is, however, not observed. |
| Databáze: | OpenAIRE |
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