Synthesis and Structural Characterisation of Copper(II) 15‐Metallacrown‐5 Complexes with Pb II , Hg II , Ag I , Na I and Y III Central Metal Ions (Eur. J. Inorg. Chem. 19/2007)

The cover picture shows the 5‐metallacrown‐5 complex, which is obtained by the self‐assembly of five copper(II) ions, five 2‐picolinehydroximate ligands (picha) and the central mercury(II) ion. The (15‐metallacrown‐5)Hg II and ‐Pb II complexes have been obtained in the crystalline form as pyridine adducts [HgCu 5 (picha) 5 (py) 7 ](NO 3 ) 2 and [PbCu 5 (picha) 5 (py) 6 ](NO 3 ) 2 (axial pyridine molecules are not shown). Unlike the analogous lanthanide(III) derivatives, which are essentially flat, the presented 15‐metallacrown‐5 system is dome‐shaped, although not as convex as the shell of the turtle Gubi (shown in the background). Gubi is the favorite pet of the daughter of one of the authors. Details are discussed in the article by J. Lisowski et al. on p. 3015 ff.