228 research outputs found
N-[Bis(benzylamino)phosphoryl]-2,2,2-trichloroacetamide
In the title compound, C16H17Cl3N3O2P, the P atom has a slightly distorted tetrahedral configuration. The conformations of the carbonyl and phosphoryl groups are anti to each other. In the crystal, intermolecular N—H⋯O hydrogen bonds link the molecules into infinite chains parallel to the b axis
Bis(N-{bis[methyl(phenyl)amino]phosphoryl}-2,2,2-trichloroacetamide)dinitratodioxidouranium(VI)
In the title compound, [UO2
L
2(NO3)2] {L = N-{bis[methyl(phenyl)amino]phosphoryl}-2,2,2-trichloroacetamide, C16H17Cl3N3O2P}, the UVI ions are eight-coordinated by axial oxido ligands and six equatorial O atoms from the phosphoryl and nitrate groups in a distorted hexagonal–bipyramidal geometry. There are disordered fragments in the two coordinating L ligands: the trichloromethyl group is rotationally disordered between two orientations [occupancy ratio 0.567 (15):0.433 (15)] in one ligand, and a methyl(phenyl)amine fragment is disordered over two conformations [occupancy ratio 0.60 (4):0.40 (4)] in the other ligand. In the crystal structure, intramolecular N—H⋯O hydrogen bonds between the amine and nitrate groups are observed
Bis{N-[bis(pyrrolidin-1-yl)phosphoryl]-2,2,2-trichloroacetamide}dinitratodioxidouranium(VI)
The crystal structure of the title compound, [U(NO3)2O2(C10H17Cl3N3O2P)2], is composed of centrosymmetric [UO2(L)2(NO3)2] molecules {L is N-[bis(pyrrolidin-1-yl)phosphoryl]-2,2,2-trichloroacetamide, C10H17Cl3N3O2P}. The UVI ion, located on an inversion center, is eight-coordinated with axial oxido ligands and six equatorial oxygen atoms of the phosphoryl and nitrate groups in a slightly distorted hexagonal-bipyramidal geometry. One of the pyrrolidine fragments in the ligand is disordered over two conformation (occupancy ratio 0.58:0.42). Intramolecular N—H⋯O hydrogen bonds between the amine and nitrate groups are found
The Influence of Strong Interaction on the Pionium Wave Functions at Small Distances
The influence of strong interaction of the behaviour of pionium
nS-state wave functions at small distance are investigated both analytically
(perturbatively) and so numerically. It is shown that in the whole the
accounting of strong interaction results in multiplying of pure Coulomb pionium
wave functions by some function practically independent on value of principal
quantum number n. Due to this reason the n-independence of probability of
atom production in nS-state remains the same as in case of pure
Coulomb interactionComment: 4 pages, 2 figure
The Influence of Strong Interaction on the Pionium Wave Functions at Small Distances
The influence of strong interaction of the behaviour of pionium nS-state wave functions at small distance are investigated both analytically (perturbatively) and so numerically. It is shown that in the whole the accounting of strong interaction results in multiplying of pure Coulomb pionium wave functions by some function practically independent on value of principal quantum number n. Due to this reason the n-independence of probability of Coulomb interactio
catena-Poly[calcium-bis[μ-N-(dimethylphosphinoyl)benzenesulfonamidato]]
The crystal structure of the title calcium complex, [Ca(C8H11NO5PS)2]n, is composed of a polymeric chain, which is formed due to two bridging sulfonyl groups linking CaII ions in a O—S—O—Ca manner. Thus, the coordination environment of the CaII ions is composed of six O atoms belonging to the phosphoryl and sulfonyl groups of two chelate rings and two additional O atoms of two bridging sulfonyl groups. The coordination polyhedron of the central atom (2 symmetry) has a distorted octahedral geometry
catena-Poly[neodymium(III)-bis[μ-N-(dimorpholinophosphoryl)benzenesulfonamidato]-sodium(I)-bis[μ-N-(dimorpholinophosphoryl)benzenesulfonamidato]]
The cubic crystal structure of the title compound, [NaNd(C14H21N3O5PS)4]n, is composed of one-dimensional polymeric chains propagating in [100], built up from [Nd(C14H21N3O5PS)4]− anions and sodium cations functioning as linkers. In the complex anion, the Nd3+ ion has an eightfold coordination environment formed by the sulfonyl and phosphoryl O atoms of four bidentate chelating N-(dimorpholinophosphoryl)benzenesulfonamidate ligands: the resulting NdO8 polyhedron can be described as intermediate between dodecahedral and square antiprismatic. The sodium ion adopts an NaO4 tetrahedral geometry arising from four monodentate benzenesulfonamidate ligands. The resulting crystal structure is unusual because it contains substantial voids (800 Å3 per unit cell), within which there is no evidence of included solvent
catena-Poly[sodium-di-μ-aqua-sodium-bis[μ-2,2,2-trichloro-N-(dimorpholinophosphoryl)acetamide]]
The title compound, [Na2(C10H16Cl3N3O4P)2(H2O)2]n, can be considered as a two-dimensional coordination polymer in which one-dimensional chains are connected to each other by intermolecular C—H⋯O hydrogen bonds involving the water molecules. The NaI ion is five-coordinated in a distorted trigonal-bipyramidal geometry. The connection between the two NaI ions is facilitated by the two μ-O atoms of the carbonyl group of the 2,2,2-trichloro-N-(dimorpholinophosphoryl)acetamide (CAPh) ligand. A bridging coordination of the CAPh ligand via the carbonyl O atom is observed for the first time. The bridging water molecules form intermolecular O—H⋯O hydrogen bonds with the O atoms of the morpholine rings and the phosphoryl groups of neighboring CAPh molecules
Quantum Hall Effect induced by electron-electron interaction in disordered GaAs layers with 3D spectrum
It is shown that the observed Quantum Hall Effect in epitaxial layers of
heavily doped n-type GaAs with thickness (50-140 nm) larger the mean free path
of the conduction electrons (15-30 nm) and, therefore, with a three-dimensional
single-particle spectrum is induced by the electron-electron interaction. The
Hall resistance R_xy of the thinnest sample reveals a wide plateau at small
activation energy E_a=0.4 K found in the temperature dependence of the
transverse resistance R_xx. The different minima in the transverse conductance
G_xx of the different samples show a universal temperature dependence
(logarithmic in a large range of rescaled temperatures T/T_0) which is
reminiscent of electron-electron-interaction effects in coherent diffusive
transport.Comment: 6 pages, 3 figures, 1 tabl
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