Mamiko Odoko

fac‐Tris(2‐ethyl‐4‐oxo‐4H‐pyran‐3‐olato‐κ2O3,O4)­iron(III) and its aluminium(III) analog

The crystal structures of the title iron(III) and aluminium(III) ethyl maltolate complexes, [Fe(C(7)H(7)O(3))(3)] and [Al(C(7)H(7)O(3))(3)], respectively, are isomorphous. In each case, the three bidentate ligand molecules are bound to the metal atom, forming a distorted octahedral coordination geometry in a fac configuration.

Cobalt(II), nickel(II) and copper(II) complexes of isoquinoline-3-carboxylate.

The crystal structures of the title complexes, namely trans-bis(isoquinoline-3-carboxylato-kappa2N,O)bis(methanol-kappaO)cobalt(II), [Co(C10H6NO2)2(CH3OH)2], and the corresponding nickel(II) and copper(II) complexes, [Ni(C10H6NO2)2(CH3OH)2] and [Cu(C10H6NO2)2(CH3OH)2], are isomorphous and contain metal ions at centres of inversion. The three compounds have the same distorted octahedral coordination geometry, and each metal ion is bonded by two quinoline N atoms, two carboxylate O atoms and two methanol O atoms. Two isoquinoline-3-carboxylate ligands lie in trans positions, forming the equatorial plane, and the two methanol ligands occupy the axial positions. The complex molecules are linked together by O-H...O hydrogen bonds between the methanol ligands and neighbouring carboxylate groups.

catena-Poly­[[(1,10-phenanthroline-κ2N,N′)silver(I)]-μ-chloro]

In the title compound, [AgCl(C12H8N2)]n, the Ag atom is four-coordinate in a highly distorted tetrahedral environment formed by two N atoms of phenanthroline and two Cl atoms. The Ag atoms are bridged by Cl atoms and the compound forms a one-dimensional polymer. Ag and Cl atoms lie on twofold rotation axes.

catena-Poly­[[[aqua(2-methyl-4-oxo-4H-pyran-3-olato-κO3,O4)copper(II)]-μ-chloro] monohydrate]

In the title complex, {[Cu(C6H5O3)Cl(H2O)]·H2O}n, the CuII atom has a deformed square-pyramidal coordination geometry formed by two O atoms of the maltolate ligand, two bridging Cl atoms and the coordinated water O atom. The Cu atoms are bridged by Cl atoms to form a polymeric chain. The deprotonated hydroxyl and ketone O atoms of the maltolate ligand form a five-membered chelate ring with the Cu atom. Stacking interactions and hydrogen bonds exist in the crystal.

The crystallographic study of left-handed Z-DNA d(CGCGCG)2 and thermine complexes crystallized at various temperatures and at various concentration of cations

In crystals of complexes of thermine and d(CGCGCG)2 molecules grown at 4, 10, and 20 degrees C, the numbers of thermine molecules connected to the DNA molecule were dependent on the temperature of the crystallization. Two molecules of thermine and one Mg2+ ion were connected to DNA molecule when thermine and d(CGCGCG)2 were co-crystallized at 4 and at 20 degrees C. When an increased concentration of magnesium and thermine molecules were co-crystallized with d(CGCGCG)2 molecules at 10 degrees C, three Mg2+ ions and only one thermine molecule were bound with a d(CGCGCG)2 molecule. The number of polyamines and of Mg2+ ions connected to DNA was dependent on the atomic values of the polyamine and of the metal ion. The binding of more Mg2+ ions occurred when the atomic value of Mg2+ exceeded that of the corresponding mono- or polyamine, and when the Mg2+ ion concentration was elevated. Furthermore, this study is the first documentation of a naturally occurring polyamine bound to the minor groove of DNA in a crystal structure.

catena-Poly[[bis­(μ2-4-methyl­benzo­ato-κ2O:O′)disilver(I)(Ag—Ag)]-μ2-di-2-pyridylamine-κ2N2:N2′] and catena-poly[[(di-2-pyridylamine-κN2)(μ2-4-nitro­benzoato-κ2O:O′)disilver(I)(Ag—Ag)]-μ3-4-nitro­benzoato-κ3O:O′:O′]

Both title compounds are polynuclear polymeric complexes with binuclear units. In the former compound, [Ag2(C8H7O2)2(C10H9N3)]n, the two Ag(I) atoms display distorted square-planar coordinations. This compound contains a twofold axis and a crystallographic inversion centre, and di-2-pyridylamine (DPA) ligands crosslink adjacent binuclear units to form infinite polymeric chains. Crystal packing is stabilized by van der Waals interactions and partial pi-pi stacking interactions between the chains. The latter compound, [Ag2(C7H4NO4)2(C10H9N3)]n, contains crystallographic inversion centres and the two Ag(I) atoms exhibit two types of distorted square-pyramidal coordination. Ag-Ag argentophilic interactions and Ag-O crosslinking between adjacent binuclear units contribute to form infinite polymeric chains. Weak pi-pi stacking interactions are observed in the polymer chain. Crystal packing is stabilized by C-H...O hydrogen bonds and by weak pi-pi stacking interactions.

Redetermination of (2,2′-bipyridyl-κ2N,N′)chloro­(glycinato-κ2N:O)copper(II) dihydrate

The redetermined structure of the title compound, [Cu(C2H4NO2)Cl(C10H8N2)]·2H2O, confirms that reported earlier [Neitzel & Desiderato (1975). Cryst. Struct. Commun. 4, 333–336] with respect to the non-H atoms. All the H atoms have been located in the present study and the network of N—H⋯O, N—H⋯Cl, O—H⋯O and O—H⋯Cl hydrogen bonds has been elucidated.