8-Hy-droxy-quinolinium tri-chlorido-(pyridine-2,6-di-carb-oxy-lic acid-κ ,,')copper(II) dihydrate.

The title compound, (CHNO)[CuCl(CHNO)]·2HO, was prepared by reacting Cu acetate dihydrate, solid 8-hy-droxy-quinoline (8-HQ), and solid pyridine-2,6-di-carb-oxy-lic acid (Hpydc), in a 1:1:1 molar ratio, in an aqueous solution of dilute hydro-chloric acid. The Cu atom exhibits a distorted CuONCl octa-hedral geometry, coordinating two oxygen atoms and one nitro-gen atom from the tridentate Hpydc ligand and three chloride atoms; the nitro-gen atom and one chloride atom occupy the axial positions with Cu-N and Cu-Cl bond lengths of 2.011 (2) Å and 2.

Norfloxacinium nitrate.

In the title salt [systematic name: 4-(3-carb-oxy-1-ethyl-6-fluoro-4-oxo-1,4-di-hydro-quin-olin-7-yl)piperazin-1-ium nitrate], CHFNO ·NO , proton transfer from nitric acid to the N atom of the piperazine ring of norfloxacin has occurred to form a mol-ecular salt. In the extended structure, N-H⋯O hydrogen bonds link alternating cations and anions into [100] chains, which are reinforced by aromatic π-π stacking inter-actions between the quinoline moieties of the norfloxacinium cations.

Bis(8-hy-droxy-quinolinium) naphthalene-1,5-di-sulfonate tetra-hydrate.

The inter-action between 8-hy-droxy-quinoline (8HQ, CHNO) and naphthalene-1,5-di-sulfonic acid (HNDS, CHOS) in aqueous media results in the formation of the salt hydrate bis-(8-hy-droxy-quinolinium) naphthalene-1,5-di-sulfonate tetra-hydrate, 2CHNO·CHOS ·4HO. The asymmetric unit comprises one protonated 8HQ cation, half of an NDS dianion symmetrically disposed around a center of inversion, and two water mol-ecules. Within the crystal structure, these components are organized into chains along the [010] and [10] directions through O-H⋯O and N-H⋯O hydrogen-bonding inter-actions, forming a di-periodic network parallel to (101).

Tetra-aqua-(ethane-1,2-di-amine-κ,')nickel(II) naphthalene-1,5-di-sulfonate dihydrate.

The reaction of ethane-1,2-di-amine (en, CHN), the sodium salt of naphthalene-1,5-di-sulfonic acid (HNDS, CHOS), and nickel sulfate in an aqueous solution resulted in the formation of the title salt, [Ni(CHN)(HO)](CHOS)·2HO or [Ni(en)(HO)](NDS)·2HO. In the asymmetric unit, one half of an [Ni(en)(HO)] cation and one half of an NDS anion, and one water mol-ecule of crystallization are present. The Ni cation in the complex is positioned on a twofold rotation axis and exhibits a slight tetra-gonal distortion of the -NiON octa-hedron, with an Ni-N bond length of 2.

Synthesis, crystal structure and Hirshfeld surface analysis of a cadmium complex of naphthalene-1,5-di-sulfonate and -phenyl-enedi-amine.

A novel -phenyl-enedi-amine (opda)-based cadmium complex, bis-(benzene-1,2-di-amine-κ ,')bis-(benzene-1,2-di-amine-κ)cadmium(II) naphthalene-1,5-di-sulfonate, [Cd(CHN)](CHOS), was synthesized. The complex salt crystallizes in the monoclinic space group 2/. The Cd atom occupies a special position and coordinates six nitro-gen atoms from four -phenyl-enedi-amine mol-ecules, two as chelating ligands and two as monodentate ligands.

Synthesis, crystal structure and Hirshfeld surface analysis of di-aqua-bis-(-phenyl-enedi-amine-κ,')nickel(II) naphthalene-1,5-di-sulfonate.

The reaction of -phenyl-enedi-amine (OPD), sodium naphthalene1,5-di-sulfonate (NaNDS) and nickel sulfate in an ethanol-water mixture yielded the title compound, [Ni(OPD)(HO)]·NDS or [Ni(CHN)(HO)](CHOS). This salt consists of a complex [Ni(OPD)(HO)] cation with two bidentate OPD ligands and aqua ligands, and a non-coordinating NDS anion, which is the double-deprotonated form of HNDS. The Ni atom is situated at a center of inversion and exhibits a slightly tetra-gonally distorted {ON} octa-hedral coordination environment, with four shorter equatorial Ni-N bonds [2.