Eu3+ ternary and tetrakis complexes with carbazole and methyl group substituted dibenzoylmethane derivatives: Induction of aggregation enhanced emission
| Autor: | Natalija Lesina, Kaspars Traskovskis, Aivars Vembris, Ilze Malina |
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| Rok vydání: | 2019 |
| Předmět: |
Dibenzoylmethane
Ligand Carbazole Process Chemistry and Technology General Chemical Engineering Substituent Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Medicinal chemistry 0104 chemical sciences chemistry.chemical_compound Intersystem crossing chemistry 0210 nano-technology Ternary operation Methyl group |
| Zdroj: | Dyes and Pigments. 163:257-266 |
| ISSN: | 0143-7208 |
| Popis: | Two dibenzoylmethane (DBM) derivatives with methyl (Me-DBM) or carbazole (CBZ-DBM) substituents at the para-position of the phenyl ring and their four novel ternary and tetrakis Eu3+ complexes with 1,10-phenanthroline (PHEN) as a secondary ligand or tetraethylamonium ion (N+(Et)4) as the counter-cation were synthesized and characterized. The investigation of the optical properties of the complexes revealed that Me-DBM based compounds exhibit aggregation enhanced emission (AEE), while in the case of CBZ-DBM this effect is not observed. At the same time, the introduction of a carbazole substituent reduces the emission quantum yield of the complexes. The decrease in luminescence efficiency for CBZ-DBM based Eu3+ complexes is mainly attributed to the closely situated S1 and T1 energy levels of the ligand that obstruct the intersystem crossing process. |
| Databáze: | OpenAIRE |
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