DETERMINATION OF CONCENTRATION AND EXTRACTION OF VANADYLPORPHYRIN COMPLEXES FROM OIL OF OIL-AND-GAS REGION «NORTH BUZACHI»

For the extraction of vanadylporphyrin complexes from oils of the oil-and-gas bearing region «North Buzachi» at 20 °C, N-N-Dimethylformamide (DMF) was used as an extractant, which shows a good isolating ability of porphyrin complexes into fractions with increasing the polarity. In the visible region the electronic spectra of metalporphyrin concentrates isolated from oil differ slightly and have two intense absorption bands at 573 nm and 534 nm, corresponding to vanadylporphyrin complexes, and at 550 nm, related to nickel porphyrins. According to the calculation method of graphical extrapolation, using the Lambert-Ber formula, content of nickel porphyrins in the extract is 11 times less than vanadylporphyrins. In the FT-IR spectra of porphyrinates, strong deformation vibrations of C-H-pyrrole fragments were detected in the absorption area 809.27 and 3024.79 cm-1, which indicate the presence of vanadium (IV) porphyrinate in the isolated fraction.

Stand-Alone CuFeSe2 (Eskebornite) Nanosheets for Photothermal Cancer Therapy

Two-dimensional CuFeSe2 nanosheets have been successfully obtained via solution-phase synthesis using a sacrificial template method. The high purity was confirmed by X-ray diffraction and the two-dimensional morphology was validated by transmission electron microscopy. The intense absorption in the 400–1400 nm region has been the basis for the CuFeSe2 nanosheets’ photothermal capabilities testing. The colloidal CuFeSe2 (CFS) nanosheets capped with S2− short ligands (CFS-S) exhibit excellent biocompatibility in cell culture studies and strong photothermal effects upon 808 nm laser irradiation. The nanosheets were further loaded with the cancer drug doxorubicin and exposed to laser irradiation, which accelerated the release of doxorubicin, achieving synergy in the therapeutic effect.

ANALYSIS OF ECOLOGICAL AND GEOCHEMICAL INDICES FOR PLANTS OF THE SPECIES POTENTILLA TANACETIFOLIA GROWING IN THE CONDITIONS OF THE CITY OF CHITA AND THE CHITA REGION

The use of biogeochemical research methods is necessary when studying the technogenic migration of toxic elements in urban ecosystems. Using the values of the ecological and geochemical indices, we assessed the degree of accumulation and movement of zinc, lead, cadmium, and copper from the soil to the organs of plants of the species Potentilla tanacetifolia. The content of elements was determined by the method of inverse voltammetry on a «TA-Universal» analyzer. According to the results of the studies and the values of environmental and geochemical coefficients, it was found that, according to the level of soil pollution, the studied areas of the city of Chita and the Chita region were classified as territories with a low level of pollution. According to the values of ecological and geochemical indices for plants of the P. tanacetifolia species, intense absorption of cadmium by the root system and active movement of zinc and copper from the root layer of soils were noted. The translocation coefficient (TF) values indicated the intake of copper, lead, and cadmium into the aboveground organs in almost all the studied sites. According to the value of the discrimination coefficient, it was found that this species intensively accumulates cadmium. The results presented by us indicate that plants of the P. tanacetifolia species can be attributed to accumulator species with a rather high degree of accumulation of heavy metals at a low concentration in the medium.

Electron-Deficient Heteroacenes that Contain Two Boron Atoms: Near-Infrared Fluorescence Based on a Push–Pull Effect

Electron-deficient heteroacenes that contain two tricoordinate boron atoms in their acene skeletons and planarized phenyl ether moieties at their periphery were synthesized via the borylation of the corresponding silicon-bridged precursors. X-ray crystallographic analysis revealed quinoidal structures, which give rise to two-step reversible redox processes for both the reduction and oxidation. These compounds exhibit intense absorption and sharp fluorescence bands with vibronic structures in the near-infrared (NIR) region. These properties originate from the push–pull effect along the long axis of the molecule derived from the electron-donating ether moiety and the electron-accepting boron moieties. Of particular note is the NIR emission of the thienothiophene-centered heteroacene, which has a maximum at 952 nm with a narrow band width of 309 cm–1 in cyclohexane. A Franck–Condon analysis revealed the crucial role of the sterically less-hindered thienothiophene spacer in achieving this sharp emission band.

Electron-Deficient Heteroacenes that Contain Two Boron Atoms: Near-Infrared Fluorescence Based on a Push–Pull Effect

Electron-deficient heteroacenes that contain two tricoordinate boron atoms in their acene skeletons and planarized phenyl ether moieties at their periphery were synthesized via the borylation of the corresponding silicon-bridged precursors. X-ray crystallographic analysis revealed quinoidal structures, which give rise to two-step reversible redox processes for both the reduction and oxidation. These compounds exhibit intense absorption and sharp fluorescence bands with vibronic structures in the near-infrared (NIR) region. These properties originate from the push–pull effect along the long axis of the molecule derived from the electron-donating ether moiety and the electron-accepting boron moieties. Of particular note is the NIR emission of the thienothiophene-centered heteroacene, which has a maximum at 952 nm with a narrow band width of 309 cm–1 in cyclohexane. A Franck–Condon analysis revealed the crucial role of the sterically less-hindered thienothiophene spacer in achieving this sharp emission band.

Don’t help them to bury the light. The interplay between intersystem crossing and hydrogen transfer in photoexcited curcumin revealed by state-hopping dynamics

Curcumin is a natural compound extracted from turmeric (curcuma longa), which has shown remarkable antiinflammatory, antibacterial, and possibly anticancert properties. The intense absorption in the visible domain, and the possibility...

The Importance of Finite Temperature and Vibrational Sampling in the Absorption Spectrum of a Nitro-Functionalized Ru(II) Water Oxidation Catalyst

Consideration of finite temperature and vibrational motion can be an essential component for accurate simulations of absorption spectra. Here we use finite-temperature Wigner phase-space sampling to investigate the intense absorption...

Phenomenology

This chapter argues that phenomenology can be methodologically enriched by engaging in second-person methods, exemplified by this chapter’s interviews with the Danish String Quartet about “losing oneself” in music. It points to the importance of relinquishing control in order to enter into an intense absorption and “losing oneself.” The chapter criticizes existing accounts of expertise and absorption for getting stuck on the question of whether one can reflect while performing, at the expense of overlooking the sense of relinquishing control or “letting the music play itself.” It elucidates the meaning of this relinquishing by pointing to the importance of bodily habitualities, the sense of agency, and affective intentionality, and concludes how this perspective can account for the conditions of possibility of playing sophisticated music while having “lost oneself.”

Merocyanine Dyes with Extended Polymethine Chains by Simple Two-Step Condensation Sequence

We describe a synthetic method for the synthesis of merocyanine dyes containing a bridge with three conjugated double bonds. This method consists of two successive condensation reactions. The first one is made between CH-acidic indane-1,3-dione acceptor units and an appropriate ketone (here acetone or hexan-2-one). The extended acceptor thus obtained is condensed with an aldehyde in the next step. The dyes show high tinctorial strength due to intense absorption bands at wavelengths between 500 and 750 nm.

SPECTROSCOPIC STUDY OF THE PROCESS OF HYPOCHROMIC EFFECT IN SOL T IN SOLUTIONS OF N UTIONS OF NATURAL D TURAL DYES AND VI YES AND VITAMIN B2 AMIN B2

The process of self-assembly of riboflavin molecules in aqueous and binary mixtures of solvents was investigated by the spectroscopic method. It was shown that during the assembly of vitamin B2 molecules, dipole-dipole interaction occurs, as a result of which resonant splitting of excited electronic levels of riboflavin molecules occurs. And the observable hypo chromic effect is due to a decrease in the intense absorption capacity of the aggregated riboflavin molecules themselves.