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The cover picture shows the hexagonal 2:4 coordination complex formed between 1,3-bis(3Π-pyridylethynyl)benzene and copper(II) acetate. The ligand, synthesized by the Sonagashira coupling of 1,3-ethynylbenzene with 3-bromopyridine, was designed to form hexagonal coordination complexes with metals that favor linear coordination geometry. In this example the dimeric copper(II) acetate paddlewheel forms an almost linear connection between a pair of dipyridyl ligands. Details are discussed in the Short Communication by E. Bosch et al. on p. 45 ff.
π SIMILAR VOLUMES
The cover picture shows two examples of stable polynuclear ruthenium systems containing delocalized carbon-rich bridges with unusual topologies. In this work, the synthesis, the spectroscopic and voltammetric studies of a new family of bis(allenylidene) and mixed allenylideneΟͺacetylide complexes are
The cover picture shows the crystal structures of free radicals of the type (tBu 2 MeSi) 3 E ΠΈ (E Ο Si, Ge, Sn) representing the first stable tricoordinate acyclic radicals of the heavier group 14 elements. All of these radicals have a perfect trigonal-planar geometry, being truly Ο radicals, both i