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排序方式: 共有105条查询结果,搜索用时 15 毫秒
1.
N. V. Petrochenkova A. G. Mirochnik M. V. Petukhova V. E. Karasev 《Polymer Science Series B》2006,48(4):194-197
The photochemical behavior of monomer and polymer complexes of Eu3+ that are based on dibenzoylmethane and acrylic acid has been studied. It has been shown that these complexes differ from their low-molecular-mass analogs by properties: in the course of photolysis, the intensity of luminescence of the studied Eu3+ complexes increases by a factor of 1.3 to 2.5. The mechanism describind the effect of the composition of polymer formulation on the rate of photodegradation is discussed. 相似文献
2.
B. V. Bukvetskii E. V. Fedorenko A. G. Mirochnik V. E. Karasev 《Journal of Structural Chemistry》2007,48(6):1148-1151
The crystal structure of boron difluoride 3-phenylthiopentane-2,4-dionate was determined. The relationship between the structure and luminescent properties is traced in the series of boron difluoride acetyl acetonates (acetyl acetonate, phenylacetyl acetonate, and phenylthioacetyl acetonate). The presence of the π stacking interactions in boron difluoride phenylthioacetyl acetonate crystals leads to increased intensity and bathochromic shift of the fluorescence band. 相似文献
3.
A. G. Mirochnik B. V. Bukvetskii P. A. Zhikhareva N. V. Polyakova V. E. Karasev 《Russian Journal of Inorganic Chemistry》2006,51(5):737-742
The crystal structure of the [Tb(BTFA)2(NO3)(TPPO)2] complex (TPPO is triphenylphosphine oxide, BTFA is benzoyltrifluoracetone), which exhibits strong triboluminescence, has been established by X-ray crystallography. The crystals are triclinic: a = 11.668(3) Å, b = 11.700(3) Å, c = 12.512(3) Å, α = 65.161(4°), β = 79.120(4)°, γ = 61.860(4)°, space group P1, Z = 1. The central terbium(III) atom coordinates two oxygen atoms from two triphenylphosphine oxide molecules (Tb-O, 2.264(3) and 2.273(3) Å), two oxygen atoms from the nitrate group (Tb-O, 2.460(3) and 2.476(3) Å), and four oxygen atoms from two benzoyltrifluoroacetonate groups (Tb-O, 2.329(3), 2.399(3), 2.351(3), and 2.367(3) Å). The coordination polyhedron of the Tb(III) atom is a distorted dodecahedron. The photoluminescence and triboluminescence spectra of the [Tb(BTFA)2(NO3)(TPPO)2] complex are identical and caused by the f-f luminescence of Tb3+. 相似文献
4.
Yu. N. Kul’chin O. B. Vitrik A. Yu. Zhizhchenko A. G. Mirochnik E. V. Fedorenko 《Optics and Spectroscopy》2012,112(4):514-518
The optical properties of a new photorecording polymer based on 2,2-difluoro-4-(9-anthracyl)-6-methyl-1,3,2-dioxaborine have
been investigated. This material is found to change its absorption coefficient and refractive index in the visible range under
illumination with a wavelength λ = 405.9 nm. This circumstance makes it possible to record static holograms with a spatial
frequency up to 2500 lines/mm, a diffraction efficiency above 60%, and a lifetime more than 6 months. A dynamic change in
the effective refractive index of this material under 405.9-nm irradiation is found, due to which one can form control optical
elements of the light-light type with a modulation frequency up to 50 Hz in it. 相似文献
5.
N. V. Petrochenkova I. A. Tkachenko A. G. Mirochnik V. E. Karasev V. Ya. Kavun 《Optics and Spectroscopy》2010,109(6):917-920
This paper reports on the results of an investigation of the luminescence and magnetic properties of europium(III) carboxylates, which are determined by the structure of the Stark and Zeeman sublevels. It has been established that the energy splittings λlum between the 7 F 0 ground level and the 7 F 1 term in the luminescence spectra of these compounds well correlate with the energy splittings λmagn obtained from magnetochemical measurements. 相似文献
6.
A. G. Mirochnik B. V. Bukvetskii E. V. Gukhman V. E. Karasev 《Journal of fluorescence》2003,13(2):157-162
The comparative study of the crystal structures of benzoylacetonato- (1), p-toluylacetonato- (2) and p-ethylbenzoylacetonatoboron (3) difluoride was carried out. Correlation of the luminescence properties of the complexes 1–3 and their crystal structures was revealed. The excimer formation in these compounds occurred the most efficiently for the complexes 1 characterized by the formation of stacks of molecules, unlike the complex 3, where individual dimers behaved as excimer-forming centers. The maximal fluorescence intensity was observed for the complex 2, which had the highest structural ordering. 相似文献
7.
8.
N. V. Petrochenkova A. G. Mirochnik P. A. Zhikhareva V. E. Karasev 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(9):1628-1630
The effect of Y(III) and Gd(III) coactivator ions on the intensity of Eu(III) and Tb(III) luminescence in monomer and polymer
mixed-metal complexes was studied. Isomorphic replacement of Eu(III) and Tb(III) ions by Y(III) and Gd(III) ions in macromolecular
complexes led to sensitization of Eu(III) and Tb(III) ion luminescence. A mechanism of columinescence was suggested. It involves
a charge transfer and the ligand orbitals and the vacant orbitals of Eu(III) and Tb(III) ions and coactivators. 相似文献
9.
B. V. Bukvetskii T. V. Sedakova A. G. Mirochnik 《Russian Journal of Coordination Chemistry》2010,36(9):651-656
The crystal structure of (C2H5)4N)2TeCl6 was determined by X-ray diffraction (a = 14.130(2) Å, b = 14.547(2)Å, c = 13.296(2)Å, β= 90.356(3)°; space group C2/c, Z = 4, ρ(calcd) = 1.387 g/cm3). The crystal structure is composed of the [TeCl6]2? anions and tetraethylammonium cations ((C2H5)4N)+. The electronic and geometric aspects that determine the spectral luminescence and thermochromic properties of the complex are discussed. 相似文献
10.
I. V. Kalinovskaya I. A. Tkachenko A. G. Mirochnik V. E. Karasev V. Ya. Kavun 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(8):1452-1454
The luminescence and magnetic properties of mixed-ligand europium trifluoroacetates with nitrogen- and phosphorus-containing
neutral ligands [Eu(TFA)3 · 3H2O]2 and Eu(TFA)3 · 2D · nH2O were studied (here TFA is the trifluoroacetic acid anion, and D is Phen (1,10-phenanthroline), n = 1; DMF (dimethylformamide), n = 1; or TPPO (triphenylphosphine oxide), n = 3). The molar magnetic susceptibility increased in the series of complex compounds Eu(TFA)3 · 2Phen · H2O < [Eu(TFA)3 · 3H2O]2 < Eu(TFA)3 · 2DMF · H2O < Eu(TFA)3 · 2TPPO · 3H2O. Correlations were found between the luminescent and magnetic characteristics of the complex compounds. 相似文献