Imidazole–imidazole stacking in some inorganic complexes

Reaction of CuCl2 · 2H2O with the 1:1 condensate (L) of 2-(2-aminoethyl)pyridine and 1-methyl-2-imidazolecarboxaldehyde in methanol yields monomeric CuLCl2.H2O (1). Recrystallisation of 1 from aqueous methanol medium containing excess of View the MathML sourcePF6− affords the 1D coordination polymer [CuLCl]n (PF6)n (2). A chloride bridge results in the coordination polymer. A face-to-face interaction is observed between the imidazole rings in 2. The interaction influences the structure and magnetic properties of 2 markedly. The complex 2 is ferromagnetic with a J value of 1.79 ± 0.01 cm−1. The imidazole fragments in 2 are coordinated to the metal. In mononuclear View the MathML source[HgL2″](ClO4)2, where L′′ is the 1:2 condensate of ethylenediamine and 1-methyl-2-imidazolecarboxaldehyde, the imidazolyl moieties are not under the direct influence of the metal. Here the imidazole–imidazole interaction is angular and more distant.