In the structure of the title salt, C(12)H(10)N(3)O(4) (+)·C(7)H(3)N(2)O(7) (-), the cations and the anions are linked by a single N(+)-H⋯O(carbox-yl) hydrogen bond, the discrete cation-anion unit having no inter-molecular associations other than weak cation-anion aromatic ring π-π inter-actions [ring centroid separation = 3.7320 (14) Å] and a number of weak inter-unit aromatic C-H⋯O contacts. ...

I study the effectiveness of fault-tolerant quantum computation against correlated Hamiltonian noise, and derive a sufficient condition for scalability. Arbitrarily long quantum computations can be executed reliably provided that noise terms acting collectively on k system qubits are sufficiently weak, and decay sufficiently rapidly with increasing k and with increasing spatial separation of th...

In the title compound, C(15)H(13)Cl(2)NO(2), the dihedral angle between the aromatic rings is 63.80 (12)°. The conformation may be stabilized by a weak N-H⋯O hydrogen bond. In the crystal structure, a short C-Cl⋯π interaction occurs, with a Cl⋯π separation of 3.5706 (13) Å.

In the title compound, C14H14O4, the dihedral angle between the hydro-furan and benzene rings is 88.41 (15)°. The hydro-pyran ring adopts an envelope conformation, with the O-bound methyl-ene C atom as the flap. In the crystal, weak aromatic π-π stacking is observed [centroid-centroid separation = 3.848 (2) Å].

There are two mol-ecules in the asymmetric unit of the title compound, C(12)H(9)BrF(2)N(2)O. They have very similar conformations: the dihedral angles between their pyrazole and benzene ring systems are 78.4 (3) and 78.6 (4)°. In the crystal, weak aromatic π-π stacking [centroid-centroid separation = 3.696 (5) Å] helps to establish the packing.

A molecular gel system was assembled on carrier particles and the integrated effect of weak interaction sites enabled highly efficient separation of the bioactive and shape-constrained isomers of tocopherols, β-carotene, and polycyclic aromatic hydrocarbons (PAHs) by multiple interaction mechanisms.

Cellular oxidative stress has been implicated as a key mechanism of cell differentiation provoked by several compounds (doxorubicins, fibrades, edelfosine). Phenylacetate and its derivatives in submillimolar to millimolar concentrations induce cell differentiation. Ion-exclusion chromatography is widely used for separation and analysis of weak acids. We applied it to the analysis of phenylaceti...

In the mononuclear title complex, [HgCl2(C20H21N3)], synthesized from the quinoline-derived Schiff base N (1),N (1)-diethyl-N (4)-(quinolin-2-yl-methyl-idene)benzene-1,4-di-amine (QMBD), the coordination geometry around the Hg(2+) atom is distorted tetra-hedral, comprising two Cl atoms [Hg-Cl = 2.3654 (19) and 2.4394 (18) Å] and two N-atom donors from the QMBD ligand, viz. one imine and quinoli...

In the title compound, C13H13NO3, the conformation across the C=C bond is synperiplanar, the torsion angle of the segment C(ring)-C=C-C(N) being 3.2 (5)°. In the crystal, mol-ecules are linked into inversion dimers, arranged in a zigzag pattern, through two C-H⋯O inter-actions generating R 2 (2)(10) and R 2 (2)(14) motifs. These dimers are arranged in a zigzag pattern in the crystal structure. ...

Symmetric branching random walk on a homogeneous tree exhibits a weak survival phase: For parameter values in a certain interval, the population survives forever with positive probability, but, with probability one, eventually vacates every finite subset of the tree. In this phase, particle trails must converge to the geometric boundary of the tree. The random subset 3 of the boundary consisti...