Note on a non-critical holographic model with a magnetic field

We consider a noncritical holographic model constructed from an intersecting brane configuration D4/$\bar{\rm{D4}}$-D4 with an external magnetic field. We investigate the influences of this magnetic field on strongly coupled dynamics by the gauge/gravity correspondence.Comment: 18 pages, references added and typos revise

2,2′-(4-Amino-4H-1,2,4-triazole-3,5-di­yl)diphenol

The structure of the title compound, C14H12N4O2, was determined as part of a project on the coordination chemistry of 1,2,4-triazole derivatives. In the crystal structure, one of the two benzene rings is almost coplanar with the five-membered triazole ring (mean deviation = 0.019 Å), whereas the second benzene ring is rotated by 51.973 (2)°. The two N—C—N—N torsion angles [170.365 (2) and −170.942 (3)°] indicate that the amido group is slightly twisted away from the triazole plane. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal structure, inter­molecular N—H⋯O and O—H⋯N hydrogen bonding is found

2-(4-Isopropyl-4-methyl-5-oxo-4,5-dihydro-1H-imidazol-2-yl)-5-methyl­nicotinic acid

In the title herbicideh/phytocide, known as imaza­pic, C14H17N3O3, the pyridine and imidazole rings are almost coplanar [dihedral angle = 3.08 (5)°]. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, an N—H⋯O hydrogen bond links mol­ecules into a chain parallel to [010]

catena-Poly[[bis­(nitrato-κ2 O,O′)cobalt(II)]-μ-4,4′-bis­(pyrazol-1-ylmeth­yl)biphenyl-κ2 N 2:N 2′]

In the title compound, [Co(NO3)2(C20H18N4)]n, the CoII atom lies on a crystallographic twofold axis and the coordination geometry can be considered as a slightly distorted tetra­hedron defined by two O atoms from two nitrate groups and two N atoms from two ligand mol­ecules. A distorted octa­hedron may be assumed when two of the symmetry-related nitrate O atoms with Co—O distances of 2.3449 (19) Å are added to the coordination environment. Another twofold axis, passing through the middle of the biphenyl bonds, is observed in the crystal structure. A chain is built up by the ligands linking the CoII ions along [101]

catena-Poly[[bis­(nitrato-κO)cobalt(II)]-bis­[μ-1,4-bis­(pyridin-3-ylmeth­oxy)benzene-κ2 N:N′]]

In the title compound, [Co(NO3)2(C18H16N2O2)2]n, the CoII ion is located on an inversion center and is six-coordinated in an octa­hedral environment defined by four N atoms of the pyridine rings and two O atoms of the nitrate anions. The ligands link the CoII ions into a linear chain running along [201]. One O atom of the nitrate ligand is disordered over two positions with site-occupancy factors of 0.59 (4) and 0.41 (4)

1,4-Bis(4-pyridylmeth­oxy)benzene

The mol­ecule of the title compound, C18H16N2O2, lies about a center of inversion. The central phenyl­ene ring is aligned at 62.7 (1)° with respect to the pyridyl ring. In the crystal, weak inter­molecular C—H⋯N hydrogen bonds link mol­ecules into sheets parallel to (104). C—H⋯O inter­actions are also present

4,4′-(o-Phenyl­enedioxy­dimethyl­ene)dipyridinium dinitrate

The cation of the salt, C18H18N2O2 2+·2NO3 −, lies about a twofold rotation axis. The pyridinium ring is almost coplanar with the phenyl­ene ring [dihedral angle between rings = 5.69 (9)°]. The crystal structure shows π–π stacking inter­actions [centroid–centroid distance = 3.70 (1) Å] between the pyridinium rings and the phenyl­ene rings, generating a linear chain structure. The cation also forms two N—H⋯O hydrogen bonds to two nitrate groups