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Formation and decay of a triplet state of dipyrido[3,2-a:2′,3′-c]phenazine
Mendeleev Communications. 2020. Vol. 30. No. 3. P. 322–324.
Glebov E., Bakulina O. D., Shushakov A. A., Matveeva S. G., Pozdnyakov I., Grivin V., Plyusnin V., Vasilchenko D., Melnikov A., Chekalin S.
The photophysical and photochemial properties of dipyrido[3,2-a:2′,3′-c]phenazine (dppz) in acetonitrile have been investigated by laser flash photolysis and ultrafast pump-probe spectroscopy. The excitation of dppz to the first singlet excited state was followed by vibrational cooling with solvent relaxation for ∼3 ps and then intersystem crossing for ∼50 ps. Spectral and kinetic characteristics of the triplet excited state have been determined.
Migulin A. V., MIlyutin C V, Lichitsky B. V. et al., Organic and Biomolecular Chemistry 2025 Vol. 23 No. 17 P. 4172–4185
In the present communication, a comprehensive study of the photochemical behavior of terarylenes with a 2-aminothiazole bridge unit and an allomaltol substituent was performed. It was shown that for the considered substrates, two types of photoprocesses can be realized. By controlling the structure of the starting material, the photoprocess can be directed toward the 6π-electrocyclization ...
Added: September 10, 2025
Paukov M. I., Starchenko V. V., Melnikov A. et al., Materials Today Chemistry 2024 No. 36 Article 101886
Added: July 24, 2025
Telegina L., Strelkova T., Ezernitskaya M. et al., Journal of Organometallic Chemistry 2020 Vol. 926 Article 121465
A series of 3-cymantrenylalkylisothioureas (2) was synthesized. DFT calculations showed that
compounds 2 in solutions are dimers. The photolysis of 2 was studied by IR, UV-vis and NMR spectroscopic
methods. Irradiation of compounds 2 results in the formation of two type chelates, in which the manganese atom is
coordinated to the S (3) or N (4) atoms of ...
Added: March 6, 2021
Фельдман В. И., Рязанцев С. В., Каменева С. В., Russian Chemical Reviews 2021 Vol. 90 P. 1145–1165
Recent progress in observational astronomy and astrophysics has stimulated the intensive laboratory studies aimed at elucidation of the mechanisms of evolution of molecular matter in interstellar space and various space objects. One of the most intriguing and rapidly developing areas of these studies is the so-called "cold astrochemistry" devoted to the complex processes occurring in ...
Added: February 28, 2021
Glebov E., Pozdnyakov I., Semionova V. V. et al., Mendeleev Communications 2020 Vol. 30 No. 1 P. 61–63
Early processes in photochemistry of 2,3-bis(2,5-dimethylthiophen-3-yl)cyclopent-2-enone were explored using the ultrafast pump-probe spectroscopy. The photocyclization occurs from the antiparallel conformation of an open form on a time scale of 7 ps, while the parallel conformation exhibits an intersystem crossing within 130 ps. The mechanism and timescales were revealed as typical of other thiophene-containing diarylethenes. ...
Added: January 18, 2021
Melnikov A., Pozdnyakov I., Chekalin S. et al., Mendeleev Communications 2020 Vol. 30 No. 4 P. 509–511
The time of ultrafast intersystem crossing for the PtIVBr62– complex in aqueous solution was measured by a fluorescence up-conversion technique. The corresponding time constant (140 ± 40 fs) is in agreement with that estimated from previous ultrafast transient absorption measurements and with the reported results of theoretical calculations. ...
Added: January 18, 2021
Shushakov A. A., Matveeva S. G., Pozdnyakov I. et al., Photochemical and Photobiological Sciences 2020 Vol. 19 P. 1222–1229
It is known that trans,cis,cis-[RuCl2(DMSO)2(H2O)2] (1a) complexes, which are formed upon dissolution of trans-[RuCl2(DMSO)4] in water, demonstrate light-induced cytotoxicity. The mechanistic study of 1a photochemistry has been performed using ultrafast pump–probe spectroscopy, laser flash photolysis and stationary photolysis. The first stage of 1a photochemistry is the photoexchange of a DMSO ligand to a water molecule; its quantum yield is wavelength-dependent (estimating ...
Added: January 18, 2021
Glebov E., Matveeva S. G., Pozdnyakov I. et al., Photochemical and Photobiological Sciences 2020 Vol. 19 P. 1569–1579
The photochemistry of the OsIVCl62− complex in ethanol was studied by means of stationary photolysis, nanosecond laser flash photolysis, ultrafast pump–probe spectroscopy and quantum chemistry. The direction of the photochemical process was found to be wavelength-dependent. Irradiation in the region of the d–d and LMCT bands results in the photosolvation (with the wavelength-dependent quantum yield) and ...
Added: January 18, 2021
Kameneva S., Volosatova A. D., Feldman V. I., Radiation Physics and Chemistry 2017 No. 141 P. 363–368
The transformations of isolated CH3CN molecules in various solid noble-gas matrices (Ne, Ar, Kr, and Xe) under the action of X-ray irradiation at 5 K were investigated by FTIR spectroscopy. The main products are CH3NC, CH2CNH and CH2NCH molecular isomers as well as CH2CN and CH2NC radicals. The matrix has a strong effect on the distribution of reaction channels. ...
Added: November 20, 2019
Kameneva S.V., Tyurin D. A., Feldman V. I., Physical Chemistry Chemical Physics 2017 No. 19 P. 24348–24356
The HCN⋯CO complex and its X-ray induced transformation to HNC⋯CO in solid noble gas (Ng) matrices (Ng = Ne, Ar, Kr, Xe) was first characterized by matrix isolation FTIR spectroscopy at 5 K. The HCN⋯CO complex was obtained by deposition of HCN/CO/Ng gaseous mixtures. The assignment was based on extensive quantum chemical calculations at the ...
Added: November 20, 2019
Kameneva S.V., Volosatova A. D., Feldman V. I., Physical Chemistry Chemical Physics 2019 No. 24 P. 13014–13021
Acetonitrile and the species resulting from its dehydrogenation play an important role in the radiation-induced evolution of organic matter in the space environment. In this work, we report on FTIR spectroscopic studies of the degradation of isolated CH3CN and CD3CN molecules induced by prolonged X-ray irradiation in solid noble gas matrices at 5 K. The ...
Added: November 20, 2019
Glebov E., Pozdnyakov I., Vasilchenko D. et al., , in: Journal of Photochemistry and Photobiology A: Chemistry. Special Issue: Molecular Photonics.: Elsevier, 2018. P. 78–85.
Diiodido Pt(IV) complexes (earlier tested as prodrugs in photodynamic therapy) could be considered as model mixed-ligand platinum complexes. In this work, photochemistry of cis,trans-[Pt-IV(en)(I)(2)(OH)(2)] complex (1) in aqueous solutions was examined in time interval from hundreds of femtoseconds to hours. UV and NMR spectroscopy, nanosecond laser flash photolysis and ultrafast spectroscopy were applied to study ...
Added: February 15, 2019
Pozdnyakov I., Melnikov A. A., Šípoš R. et al., Chemical Physics Letters 2016 Vol. 660 P. 209–213
Transient absorption spectroscopy is used to study photophysical processes of 1:1 Fe(III) complexes with all four fluorosalicylic acid isomers (Fe-FSAs) in aqueous solutions. Excited states of Fe-FSAs decay to the ground electronic state with two time constants. The faster process is interpreted as internal conversion to the vibrationally hot electronic ground state and the slower ...
Added: October 31, 2018