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L. A. Lapkina Yu. G. Gorbunova S. E. Nefedov A. Yu. Tsivadze 《Russian Chemical Bulletin》2003,52(7):1633-1636
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A. V. Vannikov A. D. Grishina Yu. G. Gorbunova T. V. Krivenko A. S. Laryushkin L. A. Lapkina V. V. Savelyev A. Yu. Tsivadze 《Polymer Science Series A》2011,53(11):1069-1075
Poly(N-vinylcarbazole) layers containing tetra-5-crown-5-gallium phthalocyaninate (R4Pc)Ga(OH) are shown to possess photoelectric and photorefractive sensitivity at a wavelength of 1064 nm. This effect is associated with the formation of supramolecular ensembles of (R4Pc)Ga(OH) molecules with electronic optical absorption in the near-IR range and nonlinear optical properties. For the composite containing 5 wt % (R4Pc)Ga(OH) supramolecular ensembles, the dependence of the quantum efficiency of mobile-charge photogeneration on electric field E 0 is well fit by the Onsager equation expanded to E 0 3 at a quantum yield of electron-hole pairs of φ0 = 0.9 s with an initial separation radius of r 0 = 9.8 Å susceptibility χ(3) equal to 1.85 × 10?10 esu is measured via the well-known method of electric-field-induced second-harmonic generation. Two-beam-coupling gain coefficient Γ is found to be 80 cm?1 at E 0 = 120 V/μm. 相似文献
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Gorbunova Yu. G. Lapkina L. A. Martynov A. G. Biryukova I. V. Tsivadze A. Yu. 《Russian Journal of Coordination Chemistry》2004,30(4):245-251
Complexing properties of lanthanide ions with respect to crown-substituted phthalocyanine are analyzed. Complexes of lanthanides (La, Nd, Sm, Eu, Gd, Tb, Yb, Lu, Y) with tetra-15-crown-5-phthalocyanine are synthesized and their structures are studied by photoelectronic, IR, 1H NMR, and mass spectrometry methods. 相似文献
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Analysis of a TE011 mode composite sapphire-rutile dielectric resonator has been carried out to study the temperature variation of resonance
frequency, close to the Cs atomic clock hyperfine frequency of 9.192 GHz. The complementary behavior of dielectric permittivity
with temperature of the composite has been exploited to obtain the desired turning point in the resonant frequency. The frequency
of the composite structure is found to be independent of the shield diameter beyond four times the puck diameter. 相似文献
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L. A. Lapkina S. G. Sakharov V. E. Larchenko Yu. G. Gorbunova A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2007,52(4):543-550
The cation-induced aggregation of sandwich crown-substituted complexes [Ln(R4Pc)2] (Ln = Lu (I) and Yb (II), R4Pc2? is the 4,5,4′,5′,4″,5″,4?,5?-tetrakis(1,4,7,10,13-pentaoxatridecamethylene)phthalocyaninate ion) and Ln2(R4Pc)3(Ln = Lu (III) and Yb (IV) in a CDCl3-DMSO-d 6 solution has been studied by 1H NMR. The data obtained are consistent with the conclusions concerning the composition of supramolecular aggregates drawn from spectrophotometric titration data. The molecules of double-decker complexes I and II form supramolecular oligomers, whereas triple-decker complexes III and IV form supramolecular dimers, which is presumably due to the stronger distortion of the planes of the outer decks of the triple-decker complexes as compared to their double-decker analogues. 相似文献
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A. A. Sinelshchikova Yu. G. Gorbunova L. A. Lapkina N. Yu. Konstantinov A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2011,56(9):1370-1379
Erbium mono-, bis-, and tris(phthalocyaninates) with tetra-15-crown-5-phthalocyanine (H2R4Pc) were synthesized and studied by spectroscopic methods. The complexes were obtained by reacting H2R4Pc with erbium salts in high-boiling solvents. To compare the efficiency of two approaches to the synthesis of double-decker
lanthanide phthalocyaninates, bis(phthalocyaninate) [Er(R4Pc)2] was also obtained by a template procedure from dicyanobenzo-15-crown-5. A combination of physicochemical methods (UV and
IR spectroscopy, MALDI-TOF mass spectrometry, 1H NMR) was used for identifying the compounds and proving their individuality and structure. The photoluminescence method
demonstrated that solutions of erbium bis- and tris(phthalocyaninates) in CHCl3 are nonfluorescent in the visible range of light whereas solutions of mono(phthalocyaninate) in CHCl3 and DMSO exhibit fluorescence with maxima at 707 and 695 nm, respectively. The oxidation of erbium mono(phthalocyaninate)
leads to fluorescence quenching. 相似文献
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L. Kh. Minacheva G. G. Aleksandrov L. A. Lapkina Yu. G. Gorbunova S. V. Demin V. E. Larchenko V. S. Sergienko A. Yu. Tsivadze 《Russian Journal of Coordination Chemistry》2005,31(9):671-682
The products of 4′,5′-dibromobenzo-15-crown-5 (I) cyanation by the Rosenmund-Braun reaction are studied by the 1H NMR and IR spectroscopy methods. X-ray diffraction analysis of two isolated products, i.e., di(4′,5′-dicyanobenzo-15-crown-5) 1.6 hydrate {(CN)2B15C5}2 · 1.6H2O (IIa) and 4′,5′-dicyanobenzo-15-crown-5,4′-cyano-5′-cyano(bromo)benzo-15-crown-5 dihydrate (CN)3.85Br0.15(B15C5)2 · 2H2O (III) is performed. Crystals IIa are monoclinic, a = 15.882(2) Å, b = 11.412(2) Å, c = 18.484(3) Å, β = 100.717(3)°, V = 3291.7(9) Å3, Z = 4, space group P21/c, R = 0.0746 for 4775 reflections with I > 2σ(I). Crystals III are monoclinic, a = 15.956(3) Å, b = 11.425(2) Å, c = 18.865(4) Å, β = 99.32(3)°, V = 3394(1) Å3, Z = 4, space group P21/c, R = 0.0692 for 2070 reflections with I > 2σ(I). Compounds IIa and III have similar structures with two crystallographically independent molecules in each (A and B in IIa; C and D in III). Four of the five O atoms of a macrocycle in molecules A and C form hydrogen bonds with the water molecules. The latter molecules lie above and below the cycle plane at a distance of ~2 Å from this plane. The A and C molecules have identical conformations (TTG TTG TTG TTG TTC) that differ from those of molecules B (TTG TGG STT SSG TTC) and D (TTC TSG STT SSG TTC). 相似文献
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L. A. Lapkina S. E. Nefedov Yu. G. Gorbunova A. Yu. Tsivadze 《Russian Chemical Bulletin》2013,62(8):1930-1933
X-ray diffraction analysis was used to establish the structure of aluminum(iii) alkoxide tetra-15-crown-5-phthalocyaninate complex. 相似文献