14,269 research outputs found
Square-planar copper(II) complexes with tetradentate amido-carboxylate ligands. Crystal structure of Na2[Cu(obap)]2.H2O. Strain and spectral assignments of complexes
No full textNovel N–N–N–O-type of tetradentate ligands H3obap (H3obap = oxamido-N-aminopropyl-N0-benzoic acid) and H3maeb
(H3maeb = malamido-N-aminoethyl-N0-benzoic acid) and the corresponding square-planar copper(II) complexes have been prepared
and characterized. The obap3 and maeb3 ligands coordinate to the copper(II) ion via four ligating atoms (three deprotonated
atoms: one carboxylate oxygen and two deprotonated amide nitrogens; one amine nitrogen) with in-plane square chelation. A
four coordinate, square-planar geometry has been established crystallographically for the binuclear Na2[Cu(obap)]2 Æ 2H2O complex.
Structural data correlating the square-planar geometry of the [Cu(obap)] unit and an extensive strain analysis are discussed
in relation to the information obtained for similar complexes. The infrared and electronic absorption spectra of the complexes are
discussed in comparison to the related complexes of known geometries. Antibacterial activity of ligands and copper(II) complexes
towards common Gram-negative and Gram-positive bacteria are reported as well
Square Planar copper(II) complexes with a novel tetradentate amido- carboxilate ligand. Crystal structure of [Co(H2O)6][Cu(mda)]2H2O
No full textStructural, biological and computational study of oxamide derivative|СТРУКТУРНА, БИОЛОШКА И РАЧУНСКА ИПИТИВАЊА ДЕРИВАТА ОКСАМИДА
No full textA dicarboxylato-diamide-type compound 2,2'-[(1,2-dioxoethane-1,2--diyl)diimino]dibenzoicacid (H(4)obbz) (1) was synthesized and characterized. The crystal structure of K(2)H(2)obbz center dot 2H(2)O (2) was determined by X-ray diffract-tion analysis. The cytotoxic activities of the compounds were tested against four different cancer cell lines MCF-7, A549, HT-29, HeLa and a human nor-mal cell line MRC-5. The results indicate reasonable dose-dependent cytotox-icity of the ligands that show selectivity against the tested carcinoma and healthy cell lines. Flow cytometric analysis and fluorescence microscopy showed that the most active compound, H(4)obbz, induced apoptosis and G0/G1 cell cycle arrest, indicating blockage of DNA synthesis as a possible mechanism that trig-gers apoptosis. Docking and molecular dynamics simulations gave similar res-ponses regarding interactions (binding) between their ligands and chaperon Grp78. The MMGBSA determined Delta G binding energies were in the range from -104 to -140 kJ mol(-1)
Characterization of two geometrical isomers of (1,3-propanediamine-N,N'-diacetato-N,N'-di-3-propionato)nickelate(II). X-ray structure of the binuclear complex trans(O5)-[Ni2(1,3pddadp)(H2O)4].4H2O and octahedral distortion of edta-type chelates
No full textBrudno's theorem for Z(d) (or Z(+)(d)) subshifts
No full textWe generalize Brudno's theorem of 1-dimensional shift dynamical system to Z(d) (or Z(+)(d)) subshifts. That is to say, in Zd (or Z(+)(d) subshift, the Kolmogorov-Sinai entropy is equivalent to the Kolmogorov complexity density almost everywhere for an ergodic shift-invariant measure. (C) 2017 Elsevier Inc. All rights reserved
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
Z(c)(3900) as a (D)over-barD* molecule from the pole counting rule
No full textA comprehensive study on the nature of the Zc(3900) resonant structure is carried out in this work. By constructing the pertinent effective Lagrangians and considering the important final-state-interaction effects, we first give a unified description to all the relevant experimental data available, including the J/psi pi and pi invariant mass distributions from the e(+)e(-) -> J/psi pi process, the h(c)pi distribution from e(+)e(-) -> h(c)pi pi, and also the D (D) over bar* spectrum in the e(+)e(-) -> D (D) over bar*pi process. After fitting the unknown parameters to the previous data, we search the pole in the complex energy plane and find only one pole in the nearby energy region in different Riemann sheets. Therefore, we conclude that Z(c)(3900) is of D (D) over bar* molecular nature, according to the pole counting rule method [Nucl. Phys. A543, 632 (1992); Phys. Rev. D 35, 1633 (1987)]. We emphasize that the conclusion based upon the pole counting method is not trivial, since both the D (D) over bar* contact interactions and the explicit Z(c) exchanges are introduced in our analyses andNational Nature Science Foundations of China (NSFC) [10925522, 11021092, 11575052, 11105038]; Natural Science Foundation of Hebei Province [A2015205205]; inoGerman Collaborative Research Center "Symmetries and the Emergence of Structure in QCD" [CRC 110]; DFG; NSFCSCI(E)ARTICLE119
Two-body open charm decays of Z(+)(4430)
No full textThe two-body open charm decays Z(+)(4430)-> D(+)(D) over bar*(0), D*(+)(D) over bar (0), D*(+)(D) over bar*(0) occur through the rescattering mechanism and their branching ratios are strongly suppressed if Z(+)(4430) is a D(1)(D) over bar* molecular state. In contrast, Z(+)(4430) falls apart into these modes easily with large phase space and they become the main decay modes if Z(+)(4430) is a tetraquark state. Experimental search of these two-body open charm modes and the hidden charm mode chi(cJ)rho will help distinguish different theoretical schemes.Astronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)0ARTICLE11null7
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