The ring skeleton of the title compound, C(14)H(4)Cl(2)N(2)O(6), is close to planar (r.m.s. deviation of the carbon atoms 0.091 Å); the nitro goups are twisted with respect to the mean plane of the ring system by 70.8 (1) and 86.7 (2)°. The crystal studied was found to be a merohedral twin, with a domain ratio of 0.61 (8):0.39 (8).

In the title compound, C(22)H(22)ClN(3)O(3), the dihedral angles between the planes of the benzene rings and the pyrazole ring are 16.05 (10) and 84.84 (10)°. The conformation of the six-membered heterocyclic ring is close to a screw-boat. The crystal packing is stabilized by weak inter-molecular C-H⋯O inter-actions and is also consolidated by C-H⋯π inter-actions.

We study the properties of two quantum particles which are confined in a ring. The interact via long-range gauge potential proportional to distance between particles. It is found that two-body ground state corresponds with non-zero angular momentum provided interaction strong enough. In addition, correlated sense depending on strength there propensity be close together or separated discuss effe...

In this work, we realize a low loss negative refraction using indefinite metamaterial of a close arrangement of split-ring resonator (SRR) arrays. A beam shift experiment has been performed to verify the negative refraction and demonstrate the low loss property. The enhanced magnetic resonance between two neighbouring SRRs broadens the resonance range and produces a frequency range with low los...

The synthesis of QRSTUVWXYZA' domains 7, 8, and 9 of the highly potent marine neurotoxin maitotoxin (1), the largest secondary metabolite isolated to date, is described. The devised synthetic strategy entailed a cascade Takai-Utimoto ester olefination/ring closing metathesis to construct ring Y, a hydroxydithioketal cyclization/methylation sequence to cast ring X, a Horner-Wadsworth-Emmons coup...

In this paper, we present a comparison of the blocking performance in unidirectional and bi-directional wavelength routed ring networks. This performance comparison reveals that, for the same load per node and equal number of wavelengths per link, the performance of a unidirectional ring with N nodes is very close to the performance of a bi-directional ring with 4N nodes. This comparison also s...

Cassini images of Saturn's small inner satellites (radii of less than approximately 100 kilometers) have yielded their sizes, shapes, and in some cases, topographies and mean densities. This information and numerical N-body simulations of accretionary growth have provided clues to their internal structures and origins. The innermost ring-region satellites have likely grown to the maximum sizes ...

Large solitary meanders form on the Agulhas Current at irregular intervals as it travels along the east coast of South Africa. These so-called Natal pulses are thought to have a significant effect on the shedding of Agulhas rings downstream at the Agulhas Retrofiection and thereby on the exchange of water properties between the Indian and the Atlantic Ocean. Data from the Geosat, ERS 1, and TOP...