Beschreibung:
<jats:p>Bis(5-chloro-8-hydroxyquinolinium) tetrachloridopalladate(II), (C<jats:sub>9</jats:sub>H<jats:sub>7</jats:sub>ClNO)<jats:sub>2</jats:sub>[PdCl<jats:sub>4</jats:sub>], (I),<jats:italic>catena</jats:italic>-poly[dimethylammonium [[dichloridopalladate(II)]-μ-chlorido]], {(C<jats:sub>2</jats:sub>H<jats:sub>8</jats:sub>N)[PdCl<jats:sub>3</jats:sub>]}<jats:sub><jats:italic>n</jats:italic></jats:sub>, (II), ethylenediammonium bis(5-chloroquinolin-8-olate), C<jats:sub>2</jats:sub>H<jats:sub>10</jats:sub>N<jats:sub>2</jats:sub><jats:sup>2+</jats:sup>·2C<jats:sub>9</jats:sub>H<jats:sub>5</jats:sub>ClNO<jats:sup>−</jats:sup>, (III), and 5-chloro-8-hydroxyquinolinium chloride, C<jats:sub>9</jats:sub>H<jats:sub>7</jats:sub>ClNO<jats:sup>+</jats:sup>·Cl<jats:sup>−</jats:sup>, (IV), were synthesized with the aim of preparing biologically active complexes of Pd<jats:sup>II</jats:sup>and Ni<jats:sup>II</jats:sup>with 5-chloroquinolin-8-ol (ClQ). Compounds (I) and (II) contain Pd<jats:sup>II</jats:sup>atoms which are coordinated in a square-planar manner by four chloride ligands. In the structure of (I), there is an isolated [PdCl<jats:sub>4</jats:sub>]<jats:sup>2−</jats:sup>anion, while in the structure of (II) the anion consists of Pd<jats:sup>II</jats:sup>atoms, lying on centres of inversion, bonded to a combination of two terminal and two bridging Cl<jats:sup>−</jats:sup>ligands, lying on twofold rotation axes, forming an infinite [–μ<jats:sub>2</jats:sub>-Cl–PdCl<jats:sub>2</jats:sub>–]<jats:sub><jats:italic>n</jats:italic></jats:sub>chain. The negative charges of these anions are balanced by two crystallographically independent protonated HClQ<jats:sup>+</jats:sup>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<jats:sup>−</jats:sup>anions, with the hydroxy groups deprotonated, and centrosymmetric ethylenediammonium cations. On the other hand, the structure of (IV) consists of a protonated HClQ<jats:sup>+</jats:sup>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. π–π interactions were observed between the HClQ<jats:sup>+</jats:sup>cations in the structures of (I) and (IV).</jats:p>