From: Neddy House <vyg@kgv.demon.nl>
Date: Oct 26, 2006 4:28 AM
Subject: crossover eastwards

Each ligand provides one O atom and one N atom. Each ligand provides one O atom and one N atom. The crystals were found to be twinned. Each molecule is nearly planar and they are roughly parallel to each other. O hydrogen bond, forming chains extended in the a-axis direction. The two symmetry-independent Co atoms show a cis-octahedral coordination. Each malonate dianion binds to the Pu atom in a bidentate fashion, resulting in the formation of six-membered metallocycles. N hydrogen-bond interactions. O hydrogen bonds, forming a two-dimensional network.

A crystallographic threefold rotoinversion axis passes through the Cr atom. bridging and terminal. Adjacent Cd coordination polyhedra share I. N hydrogen-bonding interactions contribute to the stability of the structure. O hydrogen-bonding interactions stabilize the crystal packing. N hydrogen-bond interactions. O hydrogen bonds to create centrosymmetric dimers. O hydrogen bonds and by short Cl. The asymmetric unit contains two molecules. O hydrogen bonds to form centrosymmetric hydrogen-bonded dimers. The Ni atom lies on a centre of symmetry. It adopts the classic pseudo-tetrahedral piano-stool structure. This results in helical chains propagating along the b axis of the monoclinic unit cell. bridging and terminal.

The title compound is isostructural with the chloro compound. A crystallographic threefold rotoinversion axis passes through the Cr atom. The carboxylate arms of the ligand chelate to the metal, which shows square-antiprismatic coordination. Each cation is centrosymmetric. A crystallographic threefold rotoinversion axis passes through the Cr atom. The octahedral units extend in different directions owing to the bridging association of the sulfate anions. Both five-membered rings have envelope structures. Each molecule is nearly planar and they are roughly parallel to each other. Each ligand provides one O atom and one N atom.