The asymmetric unit of the title compound, (C(6)H(9)N(2))(4)[BiCl(6)]Cl·H(2)O, contains four protonated 2-amino-6-methyl-pyridine (HAMP) cations and two-halves of two [BiCl(6)](3-) anions, together with one water mol-ecule and one chloride anion. The Bi(III) atoms are hexa-coordinated by Cl atoms, forming distorted octa-hedral geometries. In the crystal structure, intra-molecular O-H⋯Cl and N-H...

In the anion of the title compound, (C(12)H(13)N(2))[AuCl(4)], the Au(III) atom has a square-planar coordination. In the crystal, inter-molecular N-H⋯Cl and C-H⋯Cl hydrogen bonds and π-π contacts between the pyridine rings [centroid-centroid distance = 3.5419 (19) Å] result in the formation of a supra-molecular structure.

The Sm(III) ion in the title compound, [SmCl(3)(C(12)H(10)N(2)O)(3)], shows a coordination number of nine with a slightly distorted tricapped trigonal prismatic geometry based on a Cl(3)N(6) donor set. The mol-ecular structure is stabilized by three intra-molecular O-H⋯Cl hydrogen bonds.

Cerium(III) nitride chloride, Ce(2)NCl(3), contains trans-edge connected [NCe(4)](9+) tetra-hedra (222 symmetry) forming chains parallel to the c axis that are separated by Cl(-) anions. The Ce(3+) cations (..m symmetry) are each surrounded by two N(3-) and six Cl(-) anions in a bicapped trigonal prismatic coordination geometry (CN = 8).

In the title compound, (C(6)H(6)NO(2))(2)[SbCl(5)]·H(2)O, the Sb(III) atom exhibits a distorted square-pyramidal coordination geometry. The crystal structure is stabilized by inter-molecular N-H⋯Cl, N-H⋯O, O-H⋯Cl and O-H⋯O hydrogen bonds, forming an extended three-dimensional network.

The electrochemical reduction of Fe(III) to Fe(II) in the ionic liquid (IL) mixture of 1-ethyl-3-methylimidazolium ethylsulfate, [C(2)C(1)Im][EtOSO(3)], and 1-butyl-3-methylimidazolium tetrachloroferrate (III), [C(4)C(1)Im][Fe(III)Cl(4)], was monitored in situ by X-ray photoelectron spectroscopy (XPS).

We have investigated the hydration dynamics of solvated iron(ii) and iron(iii) chloride. For this, THz/FIR absorption spectra of acidified aqueous FeCl2 and FeCl3 solutions have been measured in a frequency range of 30-350 cm(-1) (≈1-10 THz). We observe a nonlinear concentration dependence of the absorption, which is attributed to the progressive formation of chloro-complexes of Fe(ii) and Fe(i...

In the title hetero-dinuclear complex, [CuSm(C(22)H(24)N(2)O(4))Cl(3)(CH(3)OH)(2)], the Cu(II) cation is N,N',O,O'-chelated by a 6,6'-dimeth-oxy-2,2'-[cyclo-hexane-1,2-diylbis(nitrilo-methanylyl-idene)]diphenolate ligand, and one Cl(-) anion further coordinates to the Cu(II) cation to complete the distorted square-pyramidal coordination geometry, while the Sm(III) cation is chelated by four O a...

In the centrosymmetric title compound, [Co(4)Cl(4)(C(3)H(6)S)](4)], the two independent Co(III) ions are each coordinated in a distorted tetra-hedral geometry by one C, one Cl and two S atoms. The mol-ecules are stabilized by C-H⋯Cl hydrogen bonds. In the crystal, inter-molecular C-H⋯Cl and C-H⋯S hydrogen bonds with R(2) (2)(8), R(4) (2)(8) and R(2) (2)(6) ring motifs generate a polymeric network.

If G is a claw-free graph, then there is a graph cl(G) such that (i) G is a spanning subgraph of cl(G), (ii) cl(G) is a line graph of a triangle-free graph, and (iii) the length of a longest cycle in G and in cl(G) is the same. A suucient condition for hamiltonicity in claw-free graphs, the equivalence of some conjectures on hamiltonicity in 2-tough graphs and the hamiltonicity of 7-connected c...