Acta Crystallographica Section C

Crystal Structure Communications

Volume 68, Part 12 (December 2012)

metal-organic compounds

 

Low-dimensional compounds containing bioactive ligands. IV. Unusual ionic forms of 5-chloroquinolin-8-ol

P. Vranec, I. Potocnák and P. Repovský

Abstract: Bis(5-chloro-8-hydroxyquinolinium) tetrachloridopalladate(II), (C₉H₇ClNO)₂[PdCl₄], (I), catena-poly[dimethylammonium [[dichloridopalladate(II)]--chlorido]], {(C₂H₈N)[PdCl₃]}_n, (II), ethylenediammonium bis(5-chloroquinolin-8-olate), C₂H₁₀N₂²⁺·2C₉H₅ClNO^-, (III), and 5-chloro-8-hydroxyquinolinium chloride, C₉H₇ClNO⁺·Cl^-, (IV), were synthesized with the aim of preparing biologically active complexes of Pd^II and Ni^II with 5-chloroquinolin-8-ol (ClQ). Compounds (I) and (II) contain Pd^II atoms which are coordinated in a square-planar manner by four chloride ligands. In the structure of (I), there is an isolated [PdCl₄]^2- anion, while in the structure of (II) the anion consists of Pd^II atoms, lying on centres of inversion, bonded to a combination of two terminal and two bridging Cl^- ligands, lying on twofold rotation axes, forming an infinite [-₂-Cl-PdCl₂-]_n chain. The negative charges of these anions are balanced by two crystallographically independent protonated HClQ⁺ cations in (I) and by dimethylammonium cations in (II), with the N atoms lying on twofold rotation axes. The structure of (III) consists of ClQ^- anions, with the hydroxy groups deprotonated, and centrosymmetric ethylenediammonium cations. On the other hand, the structure of (IV) consists of a protonated HClQ⁺ cation with the positive charge balanced by a chloride anion. All four structures are stabilized by systems of hydrogen bonds which occur between the anions and cations. - interactions were observed between the HClQ⁺ cations in the structures of (I) and (IV).

Formula: (C₉H₇ClNO)₂[PdCl₄], (C₂H₈N)[PdCl₃], C₂H₁₀N₂²⁺·2C₉H₅ClNO^- and C₉H₇ClNO⁺·Cl^-

	Chemical Markup Language (CML) file (7.3 kbytes) [ doi:10.1107/S0108270112047452/fg3281IIIsup6.cml ] Supplementary material
	Chemical Markup Language (CML) file (3.3 kbytes) [ doi:10.1107/S0108270112047452/fg3281IVsup7.cml ] Supplementary material

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