2-{[4-(Dimethyl-amino)-benzyl-idene]amino}-phenyl disulfide.

In the title mol-ecule, C(30)H(30)N(4)S(2), the two benzene rings connected through the disulfide chain form a dihedral angle of 88.7 (1)°, and the two benzene rings in the benzyl-ideneaniline fragments form dihedral angles of 34.0 (1) and 35.4 (1)°. The crystal packing exhibits no significantly short inter-molecular contacts.

1,5-Bis[1-(2,4-dihy-droxy-phen-yl)ethyl-idene]carbonohydrazide dimethyl-formamide disolvate.

In the title compound, C(17)H(18)N(4)O(5)·2C(3)H(7)NO, two solvent mol-ecules are linked to the main mol-ecule via N-H⋯O and O-H⋯O hydrogen bonds, forming a hydrogen-bonded trimer. Intra-molecular O-H⋯N hydrogen bonds influence the mol-ecular conformation of the main mol-ecule, and the two benzene rings form a dihedral angle of 10.55 (18)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds link hydrogen-bonded trimers into ribbons extending along the b axis.

1,2-Dibenzoyl-hydrazine-dimethyl-formamide (3/1).

The title compound, 3C(14)H(12)N(2)O(2)·C(3)H(7)NO, was synthesized by reaction of benzoyl chloride with hydrazine hydrate under microwave irradition. The asymmetric unit comprises three 1,2-dibenzoyl-hydrazine mol-ecules and one dimethyl-formamide mol-ecule. The 1,2-dibenzoyl-hydrazine mol-ecules are linked by pairs of N-H⋯O hydrogen bonds into chains propagating along [010].

The inhibition of Saccharomyces cerevisiae cells by acetic acid quantified by electrochemistry and fluorescence.

In this paper, the effect of acetic acid on S. cerevisiae metabolism was studied for the first time with the combinational utilization of the mediated electrochemical method and intrinsic fluorescence method, and the results from both methods were compared with each other. It was confirmed in vivo that not only the glycolysis enzymes but also the NADH dehydrogenase were sensitive to acetic acid. The established technique might also be applicable in studying the toxicity of other environmental pollutants, such as phenol and its derivatives.

Ethyl 6-(2-chloro-phen-yl)-4-methyl-1-(3-oxobut-yl)-2-thioxo-1,2,3,6-tetra-hydro-pyrimidine-5-carboxyl-ate.

In the title mol-ecule, C(18)H(21)ClN(2)O(3)S, the pyrimidine ring exhibits a half-chair conformation. The ethyl group is disordered between two positions in a ratio 0.74:0.26. In the crystal structure, the mol-ecules are linked into chains along the a axis by N-H⋯O hydrogen bonds.

Bis[2,4-penta-nedionato(1-)]bis-[4,4,5,5-tetra-methyl--2-(4-pyrid-yl)-imidazoline-1-oxyl 3-oxide]manganese(II).

In the title compound, [Mn(C(5)H(7)O(2))(2)(C(12)H(16)N(3)O(2))], the manganese(II) cation (site symmetry ) is hexa-coordinated by four O and two N atoms in a distorted trans-MnN(2)O(4) octa-hedral geometry. The four O atoms belonging to two 2,4-penta-nedionate anions lie in the equatorial plane and the two N atoms occupy the axial coordination sites.

catena-Poly[[aqua-(2,2'-bipyridyl)cobalt(II)]-µ-5-nitro-isophthalato].

In the crystal structure of the title compound, [Co(C(8)H(3)NO(6))(C(10)H(8)N(2))(H(2)O)](n), there are two symmetry-independent one-dimensional coordination polymers, which are approximately related by noncrystallographic inversion symmetry. Each zigzag chain is constructed from one Co(II) ion, one O-monodentate 5-nitro-isophthalate (ndc) dianion, one N,N'-bidentate 2,2'-bipyridyl ligand and one water mol-ecule. A symmetry-generated O,O'-bidentate ndc dianion completes the cobalt coordination environment, which could be described as very distorted cis-CoN(2)O(4) octa-hedral. The bridging ndc ligands result in parallel chains running along the a direction, and O-H⋯O hydrogen bonds arising from the water mol-ecules complete the structure.

Triaqua-(2,2'-bipyridine)(5-nitro-isophthal-ato-κO)nickel(II) monohydrate.

In the title compound, [Ni(C(8)H(3)NO(6))(C(10)H(8)N(2))(H(2)O)(3)]·H(2)O, the Ni(II) cation is six-coordinated by a chelating 2,2'-bipyridine ligand, one carboxyl-ate O atom from a 5-nitro-isophthalate dianion and three water mol-ecules, with a slightly distorted cis-NiN(2)O(4) octa-hedral geometry. The neutral complex is isolated, in contrast to coordination polymers formed by Mn(II), Co(II) and Cu(II) with the same ligand set, but forms an extensive network of O-H⋯O hydrogen bonds between the coordinated and uncoordinated water mol-ecules and carboxyl-ate groups of the 5-nitro-isophthalate ions.

3-Phenyl-1,5-di-2-thienylpentane-1,5-dione.

The asymmetric unit of the title compound, C(19)H(16)O(2)S(2), contains two independent mol-ecules with slightly different conformations. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds [C⋯O = 3.279 (15) and 3.407 (16) Å] link the mol-ecules into chains extended along the c axis.

Bis(pentane-2,4-dionato-κO,O')bis-[4,4,5,5-tetra-methyl-2-(4-pyridyl)-imidazoline-1-oxyl 3-oxide-κN]manganese(II).

The title compound, [Mn(C(5)H(7)O(2))(2)(C(12)H(16)N(3)O(2))(2)], is isostructural with its Ni(II)-containing analogue [Hao, Mu & Kong (2008 ▶). Acta Cryst. E64, m957]. The asymmetric unit comprises one-half of the mol-ecule and the Mn(II) ion is located on an inversion centre. The coordination geometry around the Mn(II) ion is slightly distorted octa-hedral, comprised of four O and two N atoms, in which the four O atoms in the equatorial plane come from two pentane-2,4-dionate ligands and the two N atoms in the axial coordination sites from 4,4,5,5-tetra-methyl-2-(4-pyrid-yl)imidazoline-1-oxyl 3-oxide.

3-[4-(Dimethylamino)phenyl]-1,5-di-phenylpentane-1,5-dione.

The asymmetric unit of the title compound, C(25)H(25)NO(2), contains two independent mol-ecules. The crystal packing exhibits weak inter-molecular C-H⋯O, C-H⋯π and π-π inter-actions.

1,5-Bis(4-bromo-phen-yl)-3-phenyl-pentane-1,5-dione.

The asymmetric unit of the title compound, C(23)H(18)Br(2)O(2), contains two independent mol-ecules with slightly different conformations. In the absence of classical inter-molecular inter-actions, the crystal packing is stabilized by van der Waals forces.

The interaction mechanisms between Saccharomyces cerevisiae and menadione and its application in toxicology study.

This study describes interaction mechanism between menadione and the yeast with the aid of the catabolite assay and the culture fluorescence method, with a view towards exploitting the potential of the mediator in toxicology study. Double mediator system containing menadione and the hydrophilic mediator, ferricyanide, was employed for evaluating the toxic effects of furfural on the yeast and the results showed the well consistence between the MICREDOX method and the conventional method.