Pavel Zasimov

• Doctor of Philosophy
• PostDoc Position at Freie Universität Berlin

We report on the generation of F2B–As=BF, an arsinoborene (boranylidenearsane) with a genuine As=B double bond, where both the As and B atoms are two-coordinate. It was obtained from the reaction of AsF3 with laser-ablated boron atoms under cryogenic conditions in neon and argon matrices. In addition, the single-bonded arsenic–boron radicals FB–AsF...

The mechanism of the chemical transformations of isolated small organic molecules induced by high-energy radiation is of basic interest for astrophysics and astrochemistry. In this work, we first applied a combination of electron paramagnetic resonance (EPR) and Fourier-transform infrared (FTIR) spectroscopy to identify the products of the radiatio...

Context . Propenal (CH 2 CHCHO) and propanal (CH 3 CH 2 CHO) have been detected in various regions of the interstellar medium (ISM), from star-forming regions to a comet’s dusty coma. These molecules attract considerable attention due to their structural similarity to aldose sugars and their potential role in prebiotic astrochemistry. Their reactio...

Free phosphaborenes have a labile boron–phosphorus double bond and therefore require extensive steric shielding by bulky substituents to prevent isomerisation and oligomerisation. In the present work, the small free phosphaborene F2B–PBF was isolated by matrix-isolation techniques and was characterised by infrared spectroscopy in conjunction with q...

The α-hydroxyethyl radical (CH3·CHOH, ²A) is a key intermediate in ethanol biochemistry, combustion, atmospheric chemistry, radiation chemistry, and astrochemistry. Experimental data on the vibrational spectrum of this radical are crucially important for reliable detection and understanding of the chemical dynamics of this species. This study repre...

Ethanol (C2H5OH) is the second important alcohol molecule in various space media (molecular clouds, star formation regions and, highly likely, interstellar ices), where it can be exposed to light and ionizing radiation leading to complex organic molecules (COMs) and eventually to the biologically important species. In order to better understand the...

This paper addresses the basic question of the impact of a chemically inert environment on the radiation-induced transformations of isolated organic molecules in icy media at cryogenic temperatures with possible implications for astrochemical issues. The radicals produced by X-ray irradiation of isolated ethanol molecules (C2H5OH and CH3CD2OH) in s...

Acetylene and ammonia are important constituents of the interstellar medium and their coupled chemistry induced by high-energy radiation may be responsible for the formation of a variety of prebiotically important organic-nitrogen compounds. In this work, we first comprehensively characterized the vibrational spectrum of the 1:1 C 2 H 2 ∙∙∙NH 3 com...

High Surface Area “3D Graphene Oxide” In article number 2200510, Nicolas Boulanger, Alexandr V. Talyzin, and co‐workers apply surface oxidation to carbon material with extremely high surface area to produce “3D graphene oxide”. This material has high oxidation degree typical for graphene oxide but also a rigid 3D structure. Hydrophilic nature, high...

Here preparation of high surface area activated reduced graphene oxide (arGO) oxidized into a 3D analogue of defect‐rich GO (dGO) is reported. Surface oxidation of arGO results in carbon to oxygen ratio C/O = 3.3, similar to the oxidation state of graphene oxide while preserving high BET surface area of about 880 m2 g−1. Analysis of surface oxidize...

We performed a systematic study of the complexes of trivalent lanthanide cations with the hydridotris(1-pyrazolyl)borato (Tp) ligand (LnTp3; Ln = La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Lu) using both high-energy-resolution fluorescence-detected X-ray absorption near-edge structure (HERFD-XANES) and resonant inelastic X-ray scattering (...

Acetaldehyde is one of the key small organic molecules involved in astrochemical and atmospheric processes occurring under the action of ionizing and UV radiation. While the UV photochemistry of acetaldehyde is well studied, little is known about the mechanism of processes induced by high-energy radiation. This paper reports the first systematic st...

Nitriles are important constituents of extraterrestrial media. Nitriles are supposed to play a crucial role in prebiotic chemistry occurring in the interstellar medium. In this work, we have investigated the low-temperature radiation-induced transformations of a 1 : 1 CH4HCN complex as a plausible precursor of the simplest nitriles using the matrix...

In this work we have examined the radiation-induced synthetic chemistry occurring in an astrochemically important C2H2–CO system at the molecular level using a matrix isolation approach. The 1:1 C2H2∙∙∙CO intermolecular complex of linear structure was obtained in the solid low-temperature (5 K) noble gas matrices by deposition of the C2H2/CO/Ng (Ng...

This work was aimed at quantitative determination of the absorbed doses under X-ray irradiation of cryogenic deposited films, particularly related to the matrix isolation experiment. The relative absorbed doses in the layers of solid noble gases of different thickness irradiated with an X-ray tube (46.6 kVp) in the specified cryostat geometry were...

X-radiolysis of the noble-gas matrices containing both H2O and CO was investigated at 5 K using infrared spectroscopy. It was found that formic acid molecule (HCOOH) could be produced from the matrix-isolated H2O⋯CO complexes, either directly as a result of irradiation or upon the subsequent annealing activating the trans-HOCO + H reaction. The for...

Investigations of the low-temperature radiation-induced transformations in the C2H2–H2O system are relevant to the chemistry occurring in interstellar and cometary ices. In this work we applied a matrix isolation technique to study the radiation-driven evolution of this system at molecular level in order to get new mechanistic insight. The 1:1 C2H2...

The radiation-induced transformations of acetylene, ethylene and ethane molecules under X-ray radiolysis in cryogenic media (noble gas matrices and neat hydrocarbon ices) at 5 K were characterized by FTIR spectroscopy. The radiation-chemical yields of decomposition of isolated hydrocarbon molecules were estimated in different solid noble gas matric...