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Two new coordination network materials with the composition M(pip)(ox) ( pip = piperazine; ox = oxalate; M = Ni, Cu) have been synthesised under ambient and hydrothermal conditions. These compounds adopt related structures, both consisting of intersecting [M(pip)] ϱ and [M(ox)] ϱ chains, which result in layered structures. The nickel compound crystallises in P1 . The metal ions are octahedrally coordinated and are linked by symmetric chelating bridging oxalate ions. In contrast, the copper compound crystallises in the chiral space group P2 1 2 1 2 1 . Here the copper atom displays square pyramidal coordination geometry and the oxalate ions bridge metals in an unsymmetric fashion resulting in a polar metal-oxalate chain structure. The magnetic behaviour is determined by the nature of the exchange-coupled net-

Reactions of [RuCl 2 (η 6 -arene)] 2 (arene = benzene, p-cymene) with nido- [7-R-10-L-7,8-C 2 B 9 H 9 ] -in THF at room temperature for 3 d give the (arene)ruthenacarborane complexes

The copper(I) compounds [Cu + is a possible structural model compound for the metal site in Ace1 and Mac1 transcription factors. In compound 2, two neutral HL ligands bind a Cu I ion in an S,SЈ-isobidentate chelating fashion to