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RESEARCH PRODUCT
Eu3+ ternary and tetrakis complexes with carbazole and methyl group substituted dibenzoylmethane derivatives: Induction of aggregation enhanced emission
Natalija LesinaKaspars TraskovskisAivars VembrisIlze Malinasubject
DibenzoylmethaneLigandCarbazoleProcess Chemistry and TechnologyGeneral Chemical EngineeringSubstituentQuantum yield02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesMedicinal chemistry0104 chemical scienceschemistry.chemical_compoundIntersystem crossingchemistry0210 nano-technologyTernary operationMethyl groupdescription
Abstract 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-04-01 | Dyes and Pigments |