In the title compound, C18H16BrNO3S, the dihedral angle between the phenyl ring and the indole ring system is 89.91 (11)°. The mol-ecular structure features weak C-H⋯O and C-H⋯Br hydrogen bonds. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds, forming chains along the a-axis direction. The chains are further linked by C-H⋯π inter-actions, forming a layer parallel to the ab pl...

The non-H atoms of the title mol-ecule, C10H10N2O, are essentially coplanar, with a maximum deviation of 0.046 (4) Å for the O atom. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds, forming chains along [010]. In addtion, weak C-H⋯π inter-actions and π-π stacking inter-actions between benzene and pyrimidine rings, with a centroid-centroid distance of 3.730 (3) Å, link the cha...

Rabbi Avraham Weiss begins his recent article, “Women and the Reading of the Megillah,” with the questions: “May women read the Megillah for other women, and for that matter, may women read the Megillah for men?” Rabbi Weiss devotes the great majority of his essay to the first issue, and while a number of points as well as the conclusion remain debatable, his essential arguments in favor of a w...

A gent internal mechanisms form the basis for many of the languages proposed for describing agent behavior and interagent protocols. These mechanisms include Soar, a general cognitive architecture for developing systems that exhibit intelligent behavior, and the Knowledge Query and Manipulation Language, a language and protocol for developing large-scale sharable and reusable knowledge bases. F...

In the title compound, C18H23N5, the imidazole ring makes a dihedral angles of 3.96 (8) and 19.02 (8)°, respectively, with the pyrazine and benzene rings while the dihedral angle between the pyrazine and benzene rings is 16.96 (7)°. In the crystal, mol-ecules are linked via N-H⋯N hydrogen bonds, forming chains along [010]. These chains are linked by C-H⋯N hydrogen bonds, forming two-dimensional...

Learning happens through interaction with others. The purpose of this study is to investigate how online interaction patterns affect students’ text revisions. As a sample, 25 undergraduate students were recruited to play multiple roles as writers, editors, and commentators in online text revisons. In playing different roles, they chose to read peer writers’ texts, edit peer writers’ errors, eva...

The asymmetric unit of the title compound, C(8)H(8)O(4)·H(2)O, contains two organic mol-ecules which are connected by the two water mol-ecules through O-H⋯O hydrogen bonds, forming an R(4) (4)(12) ring. Further O-H⋯O hydrogen bonds assemble these rings through R(6) (6)(18) rings, giving rise to infinite helical chains arranged around the b axis. These helical chains are assembled by offset π-π ...

Haldane conjectures the fundamental difference in energy spectrum of Heisenberg antiferromagnetic (HAF) spin S chain is that half-integer and integer have gapless gapped spectrums, respectively. The ground state (gs) HAF spin-1/2 spin-1 chains a quasi-long-range short-range correlation, We study effect exchange interaction between an forming normal ladder system its gs properties. inter-chain J...

The electronic structures of the low-lying excited states for two parallel chains of poly (p-phenylene-vinylene! with arbitrary relative positions are studied. The interchain interaction is treated microscopically. The energy and charge transfer fraction of the ~light-emitting! lowest singlet state are found to depend sensitively on the horizontal shift of the two chains, which is in turn deter...