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21.
Demekhin Oleg D. Zagrebaev Aleksander D. Burov Oleg N. Kletskii Mikhail E. Pavlovich Natal’ya V. Bereznyak Elena A. Tsimbalistova Marina V. Kurbatov Sergey V. 《Chemistry of Heterocyclic Compounds》2019,55(11):1128-1130
Chemistry of Heterocyclic Compounds - A method for the synthesis of berberine 13-vinyl derivatives has been developed consisting of an initial reaction of triethyl orthoformate with CH acids in the... 相似文献
22.
V. S. Pavlovich 《Journal of Applied Spectroscopy》1997,64(2):220-228
The paper sets out a statistical theory of the effect exerted by interactions of constant dipoles in solutions on the fluorescence
spectra of polar compounds. The theory is based on the concept of band structure of the electronic levels of a polar impurity
(dissolved) molecule in polar media.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 2, pp. 209–216, March–April, 1997. 相似文献
23.
24.
Irina Nikolaevna Topchieva Vasily Vladimirovich Spiridonov Nadezhda Anatol’evna Kataeva Sergey Pavlovich Gubin Sergey Konstantinovich Filippov Andrey Vladimirovich Lezov 《Colloid and polymer science》2006,284(7):795-801
Stabilization of metallic nanoparticles may be achieved by the formation of their adducts with polymers and/or nanotubes of various chemical composition. Here, water-soluble nanotubes based on β-cyclodextrin (β-tubes) were used for entrapping of Fe nanoparticles obtained by the reduction of iron-containing precursors ([Fe3(CO)11H][Et4N] cluster and FeSO4). Using methods of light-scattering, viscometry, and isothermal diffusion measurements, it was shown that the adducts are associated in aqueous solutions. The presence of iron nanoparticles and the shape and size of adducts were verified by transmission electron microscopy. The adducts are long (up to 600 nm and longer), translucent associates consisting of denser walls and transparent cores. The width of nanotubes is ∼150 nm and the thickness of the wall 3–25 nm. Their magnetic properties were demonstrated by electron paramagnetic resonance method. The mechanism of self-assembly of the adducts is discussed. 相似文献
25.
26.
6-Methyl-4(3H)-pyrimidinones containing 2-alkyl-, 2-cycloalkyl-, and 2-arylalkylamino groups were synthesized and brominated to obtain 5-bromo derivatives. 相似文献
27.
28.
New quasiparticles hystons and coherent photoinduced dynamics of molecules in polar disordered media
V. S. Pavlovich 《Journal of Applied Spectroscopy》1998,65(2):179-187
Using methods of statistical thermodynamics, it is shown that after pulse excitation the evolution of a “polar luminescent
probe—polar disordered medium” system is described by an equation of damping vibrations. This allows the conclusion that in
the solvate shell of the probe molecule synchronous rotational vibrations (librations) of the molecules of the medium occur,
whose damping is caused by dielectric friction. Such a collective synchronous motion is considered as a motion of a quasiparticle
called a hyston. The moment of inertia Jn and mass Mh of a hyston are defined as Jh=2m2
1a-3Ω0
-2(ε-1)/(2ε+1), Mh=JhMs/Js, where m1 is the dipole moment of the probe molecule in the excited S1-stute; a is the Onsager radius; Ω0 is the cyclic frequency of harmonic vibrations of the hyston; ε is the dielectric constant; Ms and Js are the mass and moment of inertia of a molecule of the medium, respectively. The correlation function of the motion of the
molecules c(t) is a solution of the equation of hyston motion. The fluorescence response s(t) in measurements with time resolution
coincides with the correlation function: s(t)=c(t). The concepts concerning hystons make it possible to describe macroscopic
photoinduced coherent motion that is manifested against a background of thermal motion of the medium molecules.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnei Spektroskopii, Vol 65, No. 2, pp. 176–183, March–April, 1998. 相似文献
29.
V. S. Pavlovich S. V. Zablotskii L. Sh. Afanasiadi 《Journal of Applied Spectroscopy》1990,53(6):1296-1301
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 53, No. 6, pp. 961–967, December, 1990. 相似文献
30.
V. S. Pavlovich 《Journal of Applied Spectroscopy》2007,74(4):501-507
We used known experimental data to analyze the influence of intermolecular interactions on the position of the 0-0-band a1Δg → X3Σ
g
−
phosphorescence of molecular oxygen in solutions. A bathochromic (red) shift caused by dispersion interactions and fluctuations
of the internal electric field (induction effect) is analyzed employing new formulas obtained by us in the framework of the
Onsager model. The contributions from intermolecular repulsion and higher multipole interactions to the shift of the spectrum
are also discussed. It is found that the polarizability in the a1Δg state is higher than in the X3Σ
g
t-
state by 0.19 ± 0.03 Å3. Taking into account the induced nature of O2 phosphorescence in solutions, it is noted that the change of polarizability Δαeg = 0.19 Å3 should differ from the change of Δαeg inherent in free molecular oxygen.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 4, pp. 453–459, July–August, 2007. 相似文献