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E. K. Alidzhanov Yu. D. Lantukh S. N. Letuta S. N. Pashkevich I. E. Kareev V. P. Bubnov E. B. Yagubskii 《Optics and Spectroscopy》2010,109(4):578-583
The optical properties of solutions of endometallofullerenes with lanthanides (Gd@C82, Ce@C82, La@C82, Y@C82) in dimethylformamide are studied. It is found that these solutions luminesce in the visible region. This luminescence is
accompanied by enhanced Raman scattering. It is suggested that these processes are related to nanoplasmon excitations in clusters
of endometallofullerenes. It is shown that the luminescence spectrum is described by a superposition of three to four Gaussian
spectral profiles, whose energy positions and intensities nonmonotonically depend on the energy of excitation quanta. A detailed
quantitative dependence of the intensity and shape of the Raman scattering signal on the concentration of endometallofullerenes
in the solutions is determined. Comparative measurements are performed for the emission spectra of solutions of simple fullerenes
and chromatographically pure endometallofullerenes. Complex investigations show that the visible luminescence and Raman scattering
enhancement are only observed in the case of the formation of nanosized anionic complexes of endometallofullerenes in the
solution. 相似文献
2.
Yu. D. Lantukh S. N. Pashkevich S. N. Letuta E. K. Alidzhanov A. A. Kul’sarin 《Optics and Spectroscopy》2011,110(6):880-884
Using electronic absorption, luminescence, and vibrational spectroscopy, we study the properties of DNA-acridine orange biopolymer
films. The conformational structure of DNA molecules in the film is examined at different levels of the relative humidity,
and the state of dye molecules incorporated into the structure of the biopolymer is estimated. These structures were formed
according to the “guest-host” principle and the dye molecule acts as the “guest” and the “host” is the intercalative DNA binding
sites. In such system dye molecules demonstrate high luminescence capability and are the uniform optical centers and their
fluorescence spectrum doesn’t depend on excitation wavelength. 相似文献
3.
Ishemgulov A. T. Letuta S. N. Pashkevich S. N. Alidzhanov E. K. Lantukh Yu. D. 《Optics and Spectroscopy》2017,123(5):828-834
Long-term luminescence of organic dyes (xanthene dyes, halogen substituted fluoroscein) was used for an in vitro study of the photodynamic effect of exogenic probes in malignant tumors and healthy tissues of mice. It is shown that the photodynamic activity of oxygen and the dynamics of its concentration in tissues can be estimated from the delayed fluorescence of exogenic probes caused by singlet–triplet annihilation of singlet oxygen and excited triplet states of the molecules of photosensitizer dyes. It is found that quenching of long-term luminescence of photosensitizers significantly differs in tumors and normal tissues.
相似文献4.
Kareev I. E. Bubnov V. P. Alidzhanov E. K. Pashkevich S. N. Lantukh Yu. D. Letuta S. N. Razdobreev D. A. 《Physics of the Solid State》2020,62(1):206-213
Physics of the Solid State - The photoexcitation energy transfer in donor–acceptor (DA) systems formed from a mixture of semiconductor polymer... 相似文献
5.
Letuta S. N. Pashkevich S. N. Alidzhanov E. K. Lantukh Yu. D. Razdobreev D. A. Chakak A. A. Ishemgulov A. T. 《Optics and Spectroscopy》2019,127(6):1169-1176
Optics and Spectroscopy - The dynamics of the consumption of oxygen during photodynamic processes and the subsequent restoration of its concentration in malignant tumors and healthy tissues of mice... 相似文献
6.
I. E. Kareev V. P. Bubnov E. K. Alidzhanov S. N. Pashkevich Yu. D. Lantukh S. N. Letuta D. A. Razdobreev 《Physics of the Solid State》2016,58(9):1924-1929
The formation of endohedral metallofullerene clusters with Y, Gd, and Ho in an N,N-dimethylformamide solution and on a mica substrate surface has been investigated using static and dynamic light scattering and atomic force microscopy, respectively. It has been found that the size distribution of the clusters depends on the concentration of endohedral metallofullerenes and on the exposure time of the solution. It has been shown that the clusters are resistant to high temperatures and ultrasound effects. The concentration of endohedral metallofullerenes at which only single clusters are formed in the solutions has been determined. It has been established that an increase in the concentration of endohedral metallofullerenes leads to the agglomeration of single clusters. The fractal dimension has been estimated, and the zeta potential of endohedral metallofullerene clusters has been measured. 相似文献
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