A series of 1,4,2-oxazaphosphorinanes was synthesized by the three-component reaction of chiral pyridylcontaining imines with trialkyl phosphites and monochloroacetic acid, followed by dealkylation ...of the P(O)OAlk-fragments of intermediates. It was established that the major diastereomers of the obtained heterocycles have the same configuration at both chiral centers. The synthesized 1,4,2-oxazaphosphorinanes show catalytic activity in the Friedel–Crafts reaction.
A series of 1 : 1 cocrystals of weak donor–acceptor complexes between toluene and fluorinated derivatives of tetracyanoquinodimethane with alternating donor and acceptor components has been obtained. ...Mutual orientation of the donor and acceptor molecules in the stacks is similar to the geometry of supramolecular dimers corresponding to the energy minimum, according DFT simulation of the pairwise interactions. Thus, despite the fact that the energy of the π–π interactions has not exceeded 4 kcal/mol, they are highly important for the supramolecular organization of the donor and acceptor components in the cocrystals. Due to small size of the donor, the crystal packing is mainly determined by weak lateral interactions involving the acceptor molecules and is strongly dependent on the number of fluorine atoms. The charge transfer is estimated using the QTAIM method and does not exceed 0.06
e
.
Complexes of phosphorylated betaine, butyl (
N
-benzyl-
N
,
N
-dibutylammonio)methyl phosphonate, were studied by IR spectrometry, which, according to X-ray diffraction analysis, crystallizes as a ...zwitterionic compound in the
P
21/
c
space group with one water molecule. Complex formation with mineral acids, as well as with nitrates of rare earth metals, proceeds with the participation of the phosphoryl fragment of the betaine molecule; in metal complexes, the nitro group acts as a counterion.
New quaternary phosphonium salts were synthesized by the reactions of tris(3-fluorophenyl)phosphine with acrylic acid and its derivatives. The structures and composition of the synthesized compounds ...were determined by modern physical methods, including X-ray diffraction. The synthesized phosphonium salts were evaluated for
in vitro
antimicrobial activity.
Aminophosphabetaines containing higher alkyl substituents at the nitrogen atom were synthesized by a three-stage procedure. The structure of the products was proved by IR and NMR spectroscopy, mass ...spectrometry, and X-ray diffraction analysis. All the synthesized compounds showed moderate antimicrobial activity against
B. cereus
and
S. aureus
bacterial strains, as well as
Candida albicans
fungi.
The crystallization of zinc phthalocyanine (ZnPc) by slow diffusion of water into the solution in 1,3-dimethyl-3,4,5,6-tetrahydro-2(1
H
)-pyrimidinone (DMPU) resulted in a formation of a series of ...crystals. The first step of crystallization involved the formation of the ZnPc(DMPU) crystal with 5-coordinated zinc. The second stage resulted in the ZnPc(H
2
O)∙DMPU concomitant polymorphs, though the coordination of the zinc ion by water is less energetically favourable, the intermolecular hydrogen bonds mediated by the coordinated water molecule compensated for this energy difference. The final stage of crystallization produced exclusively thermodynamically favourable polymorph with practically no π–π interactions between the phthalocyanine fragments. The supramolecular arrangement of the ZnPc derivatives is reflected in the optical properties of the crystals.
The nuclear
dd
-fusion reaction can proceed by three possible channels:
,
,
. Interest in
dd
-fusion has been aroused by both fundamental research and astrophysics and applied science, particularly ...in the field of fusion reactor development. In the 1970s, the idea of studying the nuclear
dd
-fusion reaction using polarized deuteron beams was proposed at the Kurchatov Institute. The development of this idea was continued in the PolFusion (polarized fusion) nuclear physics experiment, which aims at studying the reaction of nuclear
dd
synthesis with polarized source particles in the low energy region. The experiment is planned to measured the scattering asymmetries of
dd
-fusion reaction products in the final state at different mutual orientation of the spins of colliding deuterons in the energy range 10–100 keV. The authors present an overview of the status of the experiment.
A series of dialkyl aryl(hydroxy)methylphosphonates with various substituents at the phosphorus atom was obtained by the Abramov reaction. The structure of the isolated products was confirmed by IR ...and NMR spectroscopy, mass spectrometry, and X-ray diffraction analysis. All the obtained compounds demonstrated activity against
B. cereus
and
S. aureus
bacterial strains.
The Abramov reaction was used to obtain a series of dialkyl (4-chlorophenyl)(hydroxy)methylphosphonates with various alkoxy substituents on the phosphorus atom. The structure of the products was ...confirmed by physicochemical methods. The synthesized compounds were found to exhibit an antibacterial effect against B. cereus and S. aureus and antifungal effect against C. albicans, comparable to those of the reference compounds.
A series of muon experiments at the Paul Scherrer Institute in Switzerland deploy ultra-pure hydrogen active targets. A new gas impurity analysis technique was developed, based on conventional gas ...chromatography, with the capability to measure part-per-billion (ppb) traces of nitrogen and oxygen in hydrogen and deuterium. Key ingredients are a cryogenic admixture accumulation, a directly connected sampling system and a dedicated calibration setup. The dependence of the measured concentration on the sample volume was investigated, confirming that all impurities from the sample gas are collected in the accumulation column and measured with the gas chromatograph. The system was calibrated utilizing dynamic dilution of admixtures into the gas flow down to sub-ppb level concentrations. The total amount of impurities accumulated in the purification system during a three month long experimental run was measured and agreed well with the calculated amount based on the measured concentrations in the flow.
