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2.  2,2′-{1,1′-[2,2′-Oxalylbis(hydrazin-2-yl-1-yl­idene)]diethyl­idyne}dipyridinium bis­(perchlorate) dihydrate 
The title salt, C16H18N6O2 2+·2ClO4 −·2H2O, was obtained unintentionally as a major product in the reaction of Zn(ClO4)2·6H2O with the N′,N′2-bis­[(1E)-1-(2-pyrid­yl)ethyl­idene]ethanedihydrazide (H2 L) ligand. The (H4 L)2+ cation lies across a centre of inversion. The pyridiniumimine fragments of (H4 L)2+ adopt syn orientations. Intra­molecular N—H⋯N and N—H⋯O hydrogen bonds lead to the formation of S(5) motifs. In the crystal, neighbouring cations are connected by π–π inter­actions between pyridinium units with a centroid–centroid distance of 3.600 (1) Å. Moreover, the crystal components are assembled into two-dimensional layers via N—H⋯O and O—H⋯O hydrogen bonds, with no direct hydrogen-bonding inter­actions between cations.
PMCID: PMC2983988  PMID: 21580717
3.  (S,S)-N,N′-Bis(1-carb­oxy-2-methyl­prop­yl)ethyl­enediammonium dihalide cyclo­penta­nol tetra­solvate (halide = bromide/chloride ≃ 1:12) 
In the crystal structure of the title compound, C12H26N2O4 2+·2(Br0.085Cl0.915)−·4C5H9OH, the complete cation is generated by crystallographic twofold symmetry. Contamination of the chloride counter-anion with bromide occured during the preparation, due to the use of 1,2-dibromo­ethane. One of the solvent mol­ecules is disordered, with occupancies 0.53 (3):0.47 (3). The crystal packing is stabilized by an infinite two dimensional ⋯X⋯H—N—H⋯X⋯ hydrogen-bonding network (X: Br−/Cl− ≃ 1:12). In addition, O—H⋯X and O—H⋯O hydrogen bonds involving solvent mol­ecules are observed.
PMCID: PMC2968532  PMID: 21582304
4.  Bis[1,2-bis­(dimethyl­phosphino)ethane-κ2 P,P′]rhodium(I) dichlorido[(1,2,5,6-η)-1,5-cyclo­octa­diene]rhodium(I) 
In the title complex, [Rh(C6H16P2)2][RhCl2(C8H12)], the asymmetric unit contains two [Rh(dmpe)2] [dmpe = 1,2-bis­(dimethyl­phosphino)ethane] half-cations, lying on inversion centers, and an [RhCl2(cod)]− (cod = 1,5-cyclo­octa­diene) anion, wherein Rh is coordinated by two chloride ligands and two olefinic π-bonds of the cyclo­octa­diene ligand. The Rh atoms in the cations and anion exhibit square-planar coordination and are separated without any unusual inter­actions.
PMCID: PMC2959718  PMID: 21580855
5.  Hexaaqua­magnesium(II) bis­(d-camphor-10-sulfonate) 
The structure of the title complex, [Mg(H2O)6](C10H15O4S)2, consists of regular octa­hedral [Mg(H2O)6]2+ cations and d-camphor-10-sulfonate anions. A three-dimensional supra­molecular architecture is formed via hydrogen-bond inter­actions [O—H⋯O = 2.723 (2)–2.833 (2) Å] to give alternating layers of [Mg(H2O)6]2+ cations and d-camphor-10-sulfonate anions. The title compound is isomorphous with the zinc, copper, cadmium and nickel analogues.
PMCID: PMC2961654  PMID: 21202801

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