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排序方式: 共有66条查询结果,搜索用时 31 毫秒
1.
Salimgareeva V. N. Polevoi R. M. Kolesov S. V. Ostakhov S. S. Ponomareva V. A. Leplyanin G. V. 《Russian Journal of Applied Chemistry》2003,76(5):804-808
The luminescence and scintillation properties of poly(methyl methacrylate) containing 1,1,3-trimethyl-3-phenylindan were studied. 相似文献
2.
V. P. Kazakov A. I. Voloshin S. S. Ostakhov N. Sh. Ableeva 《Russian Chemical Bulletin》1995,44(3):432-436
The thermal decomposition of dispiro(1,2-dioxetane-diadamantane) (1) sorbed on silipore containing EuCl3 ando-phenanthroline was investigated. The observed chemiluminescence is caused by radiative deactivation of EU*(iii) formed according to an energy transfer mechanism. Chemiluminescence decay in the course of the decomposition of1 is exponential with the rate constantk. The activation parameters of the decomposition of1 sorbed on silipore were determined from the temperature dependence ofk. These parameters are independent of the Eu(iii) content. A kinetic compensating effect was found: the dependence of logA onE
a as a function of the content of1. The mechanism of the compensating effect is discussed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 447–451, March, 1995. 相似文献
3.
The complex formation of alicyclic ketones, viz., camphor, cyclohexanone, menthone, and cytisine, with the Eu(fod)3 chelate (fod is 7,7-dimethyl-1,1,1,2,2,3,3-heptafluorooctane-4,5-dione) in the ground and excited states was studied by chemiluminescence and kinetic luminescence spectroscopy, respectively. The stability constants and thermodynamic parameters of complex formation were determined. An increase in the stability of the electron-excited complexes [Eu(fod)3*·Ketone] is explained by the enhancement of the acceptor ability of the Eu3+ chelate due to an increase in the fraction of the covalent component caused by the involvement of 4f-orbitals. The results obtained give direct evidence for the effect of the 4f-shell excitation of Eu(fod)3 on complex formation due to the involvement of f-electrons in the chemical bonds. 相似文献
4.
The processes of complexation and solvation in the Tb(ClO4)3 · nH2O –adamantylideneadamantane-1,2-dioxetane (I)–benzophenone (II) system in acetonitrile solutions were studied at 280–320 K. The complexation of Tb(ClO4)3 · nH2O in ground and electronically excited states with I and II was found out. An anomalous increase in the lifetime of Tb(ClO4)*
3 · nH2O with temperature was observed; this anomalous increase is indicative of a structural change in the environment of the terbium ion in solution. It was found that of Tb(III)* increased because of rearrangement of the inner sphere of solvation aqua complexes toward the replacement of H2O molecules by solvent molecules that exhibit a lower quenching ability. 相似文献
5.
V. P. Kazakov A. I. Voloshin S. S. Ostakhov E. V. Zharinova 《Russian Chemical Bulletin》1998,47(3):386-393
Catalysis of decomposition of dispiro(diadamantane-1,2-dioxetane) (1) in the presence of EuIII and TbIII tris(benzoyltrifluoroacetonate) complexes (Ln(btfa)3) accompanied by the formation of adamantanone (2) and chemiluminescence (CL) was studied. The rate constants (k 2) of decomposition of compound1 in the1·Ln(btfa)3 complexes and their stability constants (K 1) have been determined. The Arrhenius parameters of decomposition of1 (E a= 22.4±0.7 kcal mol?1, logA=10.2±0.8 for1·Tb(btfa)3 andE a=23.4±0.6 kcal mol?1, logA=10.6±0.8 for1·Eu(btfa)3) and thermodynamic parameters of complex formation (ΔH=?5.5±0.5 kcal mol?1, ΔS=?10.4±0.7 e.u. for1·Tb(btfa)3 and ΔH=?5.8±0.5 kcal mol?1, ΔS=?10.9±0.7 e.u. for1·Eu(btfa)3) have been calculated from the temperature dependences ofk 2 andK 1. The yields of excitation of the Ln(btfa)3 chelates φ Eu * =0.021±0.006 and φ Tb * =0.12±0.04 have been determined. A higher efficiency of the occupation of the5D4-level of Tb3+ compared to those of the5D1- and5D0-levels of Eu3+ is caused by different efficiencies of the non-radiative energy dissipation in the Ln3+ ion after the intracomplex energy transfer from the3n,π*-state of2 to the resonance excited levels of lanthanides. 相似文献
6.
7.
S. S. Ostakhov M. V. Sultanbaev M. Yu. Ovchinnikov R. R. Kayumov S. L. Khursan 《High Energy Chemistry》2017,51(2):108-112
A spectral-luminescence study of neutral (pH 7) and alkaline (pH 11 and 14) aqueous solutions of the anticancer drugs 5-fluorouracil (FU) and tegafur has been performed. The fluorescence spectra of the N3- and N1-centered anions of 5-fluorouracil, its dianion, and the tegafur monoanion with emission maxima at wavelengths (λem) of 358, 372, 366, and 358 nm and photoluminescence quantum yields (φ) of 11.2 × 10–4, 35.1 × 10–4, 26.5 × 10–4, and 8.6 × 10–4, respectively, have been recorded for the first time. The fluorescence characteristics of the FU anionic forms have been related to the magnetic shielding constant as one of the criteria of aromaticity. 相似文献
8.
High Energy Chemistry - The quenching of fluorescence (FL) of uranyl ion $${\text{UO}}_{2}^{{2 + }}$$ and tryptophan Trp during their selective intracomplex photoexcitation in aqueous and methanol... 相似文献
9.
Ostakhov S. S. Masyagutova G. A. Tsyrlina E. M. Gabbasov T. M. Khursan S. L. Yunusov M. S. 《Chemistry of Natural Compounds》2021,57(6):1051-1055
Chemistry of Natural Compounds - The photophysical and photochemical processes of N-deacetyllappaconitine (DAL) and its hydrobromide (DAL·HBr) in aqueous solutions were investigated. Their... 相似文献
10.