Bis[μ-N'-(2-oxidobenzyl-idene)thio-phene-2-carbohydrazidato]bis-[dimethanol-nickel(II)].

In the crystal structure of the centrosymmetric binuclear title complex, [Ni(2)(C(12)H(8)N(2)O(2)S)(2)(CH(3)OH)(4)], there are inter-molecular O-H⋯O, O-H⋯N and O-H⋯S hydrogen bonds. These help to stabilize the structure and link the mol-ecules, forming a three-dimensional network structure. The Ni(2+) cation exists in a slightly distorted octahedral NiNO(5) coordination environment.

4-Eth-oxy-N'-propanoylpyridine-2-carbohydrazide.

In the crystal structure of the title compound, C(11)H(15)N(3)O(3), mol-ecules are linked into a chain by inter-molecular N-H⋯O hydrogen bonds.

5,6-Dihydr-oxy-1,10-phenanthrolin-1-ium chloride dihydrate.

The title compound, C(12)H(9)N(2)O(2) (+)·Cl(-)·2H(2)O, exhibits a layered structure which is stabilized by inter-molecular O-H⋯O, O-H⋯Cl(-) and N(+)-H⋯Cl(-) hydrogen bonds, and π-π inter-actions (centroid-centroid distances = 3.654 and 3.583 Å).