The asymmetric unit of the title compound, C(18)H(16)Cl(4)N(2)O(2), comprises half of a potentially tetra-dentate Schiff base ligand. It is located about a twofold rotation axis that bis-ects the central C-C bond of the butane-1,4-diamine group. There are two intra-molecular O-H⋯N hydrogen bonds making S(6) ring motifs. In the crystal, mol-ecules are linked by pairs of weak C-H⋯Cl inter-actions...

In the title mol-ecule, C(23)H(16)N(2)O(2), the two exocyclic C=C bonds bearing the tolyl groups have an E configuration and the beznene rings are oriented at 22.1 (1) and 24.8 (1)° with respect to the mean plane of the atoms of the furan ring.

The 30 non-H atoms in title dihydrazine compound, C(20)H(16)N(6)O(4)·2H(2)O, are close to coplanar, the r.m.s. deviation for these atoms being 0.096 Å. The conformation about each of the C=N bonds is E, and the mol-ecule has non-crystallographic 2/m symmetry. The presence of O-H⋯O and N-H⋯O hydrogen bonding leads to a three-dimensional network in the crystal structure. A highly disordered solve...

The title compound, [Al(CH(3))(2)(C(29)H(39)N(2)O(2))], exhibits disorder of one of the tert-butyl groups on the Schiff base ligand, where each methyl group is located over two sites, with occupancy factors of 0.57 (1) and 0.43 (1). The geometry around the Al(III) atom is distorted tetra-hedral, defined by two methyl groups, one N and one O atom from the Schiff base ligand.

In the title compound, C(18)H(17)NO(4), the hy-droxy-ethanimine group is essentially coplanar with the ring to which it is attached [C-C-N-O torsion angle = 179.94 (14)°]. The mol-ecules are linked into cyclic centrosymmetric R(2) (2)(6) dimers via O-H⋯N hydrogen bonds and the crystal packing is further stabilized by C-H⋯O inter-actions.

High-energy physics will begin to explore a new energy frontier when the Large Hadron Collider at CERN turns on in 2007. Our understanding of physics at very small distances will dramatically improve. However, a detailed investigation of the new physics we discover will require a careful study of Standard Model backgrounds, detector responses, and other similar issues. Since many layers separat...

In the crystal structure of the title compound, C(7)H(14)N(4)OS, mol-ecules are linked through N-H⋯S and O-H⋯N hydrogen bonds and C-H⋯S interactions, forming chains propagating along [21-1].

In the title compound, C(20)H(21)NO(4), the two benzene rings are almost perpendicular to each other, making a dihedral angle of 86.1 (7)°. The hy-droxy-ethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane of the hy-droxy-ethanimine [C=N-OH] group being 0.011 (1) Å for the O atom. An intra-molecular C-H⋯O hydrogen bond occurs. The mol-ecules ...

In the title compound, C(20)H(21)NO(5), the dihedral angle between the mean planes through the two rings is 47.1 (8)°. The enoate group assumes an extended conformation. The hy-droxy-ethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.061 (1) Å for the O atom. In the crystal, mol-ecules are linked into cyclic centrosymmetric dimers w...