(5,5,7,12,12,14-Hexameth­yl-1,4,8,11-tetra­aza­cyclo­tetra­deca­ne-1,8-diacetato)cobalt(II) tetra­hydrate

The Co atom in the title compound, [Co(C₂₀H₃₈N₄O₄)]·4H₂O, is chelated by the four N atoms of the macrocycle and also covalently bonded to two carboxyl­ate O atoms in a cis-N₄O₂Co octa­hedral environment. The mononuclear mol­ecule inter­acts with the non-coordinated water mol­ecules by way of O—H...O inter­actions to form a three-dimensional network.

Salicyl­idene­acetone

The title compound, (E)-4-(2-hydroxy­phenyl)­but-3-en-2-one, C₁₀H₁₀O₂, was synthesized from salicyl­aldehyde and acetone. The mol­ecule is essentially planar, suggesting a high degree of conjugation throughout the system. Intermolecular hydrogen bonds link adjacent mol­ecules to form one-dimensional chains.

1,4,8,11-Tetra­kis(carboxy­meth­yl)-5,5,7,12,12,14-hexa­meth­yl-1,4,8,11-tetra­azoniacyclo­tetra­deca­ne tetra­chloride octa­hydrate

The crystal structure of the centrosymmetric title compound, C₂₄H₄₈N₄O₈⁴⁺·4Cl^-·8H₂O, consists of a 14-membered meth­yl-substituted C₁₀N₄ cationic ring which inter­acts with the chloride ions and water molecules of crystallization to give a three-dimensional hydrogen-bonded network structure.

Chloro­metronidazole

In the title compound, 1-(2-chloro­ethyl)-2-methyl-5-nitro-1H-imidazole, C₆H₈ClN₃O₂, the dihedral angle between the imidazole ring and the attached nitro group is 6.5 (1)°.

Iodo­metronidazole

In the title compound, 1-(2-iodo­ethyl)-2-methyl-5-nitro-1H-imidazole, C₆H₈IN₃O₂, the dihedral angle between the imidazole ring and the nitro group attached to it is 7.8 (1)°.