Synthesis, structure, photo- and electroluminescent properties of zinc(II) complexes with aminomethylene derivatives of 1-phenyl-3-methyl-4-formylpyrazol-5-one and 3- and 6-aminoquinolines

[Display omitted] •Pyrazole-quinoline derived N, O bidentate Schiff base ligands and their complexes.•XAFS spectroscopy of complexes.•Photo- and electroluminescent properties of zinc complexes. Quinolyl-3-pyrazole (I) and quinolyl-6-pyrazole (II) azomethines have been used as precursors to novel zin...

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Bibliographic Details
Published in:Synthetic metals 2015-05, Vol.203, p.156-163
Main Authors: Burlov, Anatolii S., Vlasenko, Valery G., Dmitriev, Artem V., Chesnokov, Vasilii V., Uraev, Ali I., Garnovskii, Dmitrii A., Zubavichus, Yan V., Trigub, Alexander L., Vasilchenko, Igor S., Lypenko, Dmitrii A., Mal’tsev, Eugenii I., Lifintseva, Tat’yana V., Borodkin, Gennadii S.
Format: Article
Language:English
Subjects:
Azomethines
Derivatives
Devices
DFT computation
Electroluminescence
LED
Luminance
Luminescence
Mathematical analysis
Quantum chemistry
Spectra
XAFS
Zinc
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Summary:[Display omitted] •Pyrazole-quinoline derived N, O bidentate Schiff base ligands and their complexes.•XAFS spectroscopy of complexes.•Photo- and electroluminescent properties of zinc complexes. Quinolyl-3-pyrazole (I) and quinolyl-6-pyrazole (II) azomethines have been used as precursors to novel zinc complexes (III, IV, correspondingly) that have been synthesized and thoroughly investigated by IR, UV–vis, NMR 1H spectroscopy. The atomic structure of the complexes was determined by quantum-chemical calculations (DFT-optimization of the molecules geometry). The results obtained were compared with quantitative characteristics of the local atomic environment of zinc ions derived from Zn K-edge EXAFS. Theoretical and experimental data on the bond lengths within the metal coordination sites are in a good agreement. Bands in experimental UV–vis spectra have been assigned based on computational results. Photo- and electroluminescent properties of zinc complexes have been investigated. The photoluminescence maximum occurs around λ=478nm for both compounds. Prototypes of electroluminescent devices utilizing the complexes as active media were designed and tested. The device with III as the electroluminescent layer shows a luminance of 800Cd/m2 at 10V with conversion efficiency of 0.5Lm/W, whereas the device with IV as the electroluminescent layer demonstrates somewhat lower characteristics, viz., 200Cd/m2 at 13V.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2015.02.028