Tetra-ethyl-ammonium toluene-4-sulfon-ate.

There are two tetra-ethyl-ammonium cations and two toluene-4-sulfate anions in the asymmetric unit of the title salt, C8H20N(+)·C7H7O3S(-). One of the anions is disordered over two positions, with refined occupancies of 0.447 (3) and 0.553 (3). In the crystal, the cations and anions are linked by C-H⋯O hydrogen bonds, forming ribbons along [10-1]. The ribbons are linked via C-H⋯O hydrogen bonds, forming a two-dimensional network lying parallel to (10-1).

Tris(1,10-phenanthroline-κ(2) N,N')ruthenium(II) bis-(perchlorate).

The asymmetric unit of the title compound, [Ru(C12H8N2)3](ClO4)2, contains one octahedrally coordinated Ru(II) cation of the ruthenium-phenanthroline complex and three differently occupied perchlorate anions: two, denoted A and B, are located on the twofold axis while another, denoted C, is positioned in the proximity of the twofold screw axis. Perchlorate anions B and C are severely disordered. The occupancies of the two major conformers of anion B refined to 0.302 (6) and 0.198 (6). Perchlorate ion C was modeled in two alternate conformations which refined to occupancies of 0.552 (10) and 0.448 (10).

Bis(2,2':6',2''-terpyridine)-ruthenium(II) bis-(perchlorate) hemihydrate.

The asymmetric unit of the title compound, [Ru(C(15)H(11)N(3))(2)](ClO(4))(2)·0.5H(2)O, contains one ruthenium-terpiridine complex cation, two perchlorate anions and one half-mol-ecule of water. Face-to-face and face-to-edge π-stacking inter-actions between terpyridine units [centroid-centroid distances = 3.793 (2) and 3.801 (2)  Å] stabilize the crystal lattice The partially occupied water mol-ecule inter-acts with two perchlorate ions via O-H⋯O hydrogen bonds. In the crystal lattice, the complex cations, perchlorate ion-water pairs and the second perchlorate anions are arranged into columns along b direction.