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1

Mechanochemical synthesis of thenoyltrifluoroacetone-1,10-phenanthroline europium complex

100%

Zaharieva J., Milanova M., Todorovsky D.

Open Chemistry

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2012

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vol. 10

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issue 6

1907-1912

EN

The paper considers the possibilities for mechanochemical synthesis of rare earth complexes. The complex Eu(TTA)3·phen (HTTA - 2-thenoyltrifluoroacetone, phen - 1,10-phenanthroline) is synthesized by mechanical treatment of a mixture of EuCl3.6H2O, HTTA, phen and NaOH in planetary ball mill Pulverisette 7 for 30 min at 800 min−1. The non reacted starting reagents and reaction side products are separated by treating activated mixture with water-ethanol solution following a procedure proposed in the literature. The elemental composition, X-ray diffraction pattern, IR spectra, optical properties (excitation and emission spectra, luminescence lifetime) and morphology of the mechanochemically synthesized complex are compared with those of the complex prepared from solution by the conventional method. The results confirm close similarity in the molecular structure and identity of the elemental composition, X-ray diffractograms and fluorescence properties of the compounds prepared by both methods. [...]

2

Synthesis of terbium(III) complex with a biscoumarin derivative and its immobilization in PMMA-based composite thin films with fluorescent properties

100%

Elenkova D., Getsova M., Zaharieva J., Manolov I., Milanova M.

Open Chemistry

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2013

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vol. 11

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issue 7

1032-1041

EN

An amorphous complex of Tb(III) with the biscoumarin derivative 3,3′-[(4-hydroxyphenyl)methylene)]bis-(4-hydroxy-2H-1-benzopyran-2-one), Tb(H2L)3, was successfully synthesized and characterized. IR- and 1H-NMR-spectroscopy were used to investigate the coordination of the ligand around the Tb(III) ion. Values for the quantum yield and the life time of the excited state of the complex were obtained. The complex was immobilized in transparent and flexible PMMA-based films by a simple casting technique. PMMA/chloroform solutions were used in synthetic procedures that resulted in both glass-supported and self-supporting nanocomposite films. The morphology of the films was studied by scanning electron microscopy, atomic force microscopy and transmission electron microscopy, showing the formation of crack-free films. The presence of the Tb(III) complex in the matrix was proven by the presence of characteristic bands in the IR spectra. Fluorescence microscopy and fluorescence spectroscopy demonstrated the promising optical properties of the films showing the characteristic emission bands of the Tb(III) ions. The longer life time of the excited state of the immobilized complex confirmed the protective role of the PMMA matrix on the optical properties of the complex. The composite films possessing optical properties have the potential for application as active components in optical devices. [...]

3

Shape-controlled synthesis of polyhedral CdS flowerlike architectures and their optical properties

100%

Kong Q., Wu H., Zhang X., Yao S., Zhang J., Zhang X.

Open Chemistry

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2013

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vol. 11

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issue 10

1682-1688

EN

Fabrication of polyhedral CdS flower-like architectures have been achieved on a large scale through a mixed solvothermal method. The obtained CdS are characterized by X-ray diffraction, field-emission scanning electron microscopy and transmission electron microscopy, and the results indicate that the CdS flower-like architectures with diameters of 1.5–2.0 µm are hexagonal wurtzite phase and are assembled by some pyramids with the bottom side length of about 440 nm, which have some crystallographic faces. A series of relevant experiments through altering experimental parameters, indicate that the temperature, starting materials and solvent play key roles for the shape evolution of CdS flower-like architectures. The studies of optical properties for polyhedral CdS flower-like architectures indicate that the UV-vis spectroscopy shows a blue-shift absorption peak at 500 nm compared to that of bulk CdS, the photoluminescence spectroscopy shows an emission peak at 640 nm and another strong emission peak at 695 nm, which are believed to be attributed to excitonic emission and deep levels. [...]

4

Significant Increment of the Dielectric Permittivity and Domain Properties in the (1-x)PbTiO3-x(Na0.5Bi0.5)TiO3 Crystals

100%

Czaja P., Piasecki M., Zapart M. B., Suchanicz J., Konieczny K., Michniowski J., Sitko D., Stachowski G., Kluczewska-Chmielarz K., Czaja P., Piasecki M., Zapart M. B., Suchanicz J., Konieczny K., Michniowski J., Sitko D., Stachowski G., Kluczewska-Chmielarz K.

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vol. 65

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issue 1

5

Synthesis and optical properties of self-assembled flower-like CdS architectures by mixed solvothermal process

100%

Zhang J., Wu Y., Zhu J., Huang S., Zhang D., Yin Q.

Open Chemistry

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2010

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vol. 8

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issue 5

1027-1033

EN

Self-assembled CdS architectures with flower-like structures have been synthesized by a mixed solvothermal method using ethylene glycol and oleic acid as the mixed solvent at 160°C for 12 h. The results of X-ray diffraction (XRD) patterns, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images indicate that the product exists as the hexagonal wurtzite phase and conatins of larger numbers of flower-like CdS architectures with diameters of 1.8–3 μm. The selected-area electron diffraction (SAED) pattern and the high resolution transmission electron microscope (HRTEM) image reveal that the grain has better crystallinity. The optical properties of flower-like CdS architectures were also investigated by ultraviolet-visable (UV-vis) and photoluminescence spectroscopy at room temperature. A strong peak at 490 nm is shown in the UV-vis absorption, while an emission at 486 nm and another strong emission at 712 nm are shown in the PL spectrum. [...]

6

The Ru Impurity Effect on Electronic, Optical and Thermoelectric Properties of MoS2 Nano-Sheet: a DFT Study

86%

Dezfuli F. M., Boochani A., Parhizgar S. S., Darabi E., Dezfuli F. M., Boochani A., Parhizgar S. S., Darabi E.

Archives of Metallurgy and Materials

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2021

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vol. 66

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issue 2

Refine search results

Mechanochemical synthesis of thenoyltrifluoroacetone-1,10-phenanthroline europium complex

Synthesis of terbium(III) complex with a biscoumarin derivative and its immobilization in PMMA-based composite thin films with fluorescent properties

Shape-controlled synthesis of polyhedral CdS flowerlike architectures and their optical properties

Significant Increment of the Dielectric Permittivity and Domain Properties in the (1-x)PbTiO3-x(Na0.5Bi0.5)TiO3 Crystals

Synthesis and optical properties of self-assembled flower-like CdS architectures by mixed solvothermal process

The Ru Impurity Effect on Electronic, Optical and Thermoelectric Properties of MoS2 Nano-Sheet: a DFT Study