MS32-P19 Magnetic properties of highly symmetrical compounds of cobalt(II) and nickel(II)The proper symmetry of crystal lattice determines the presence of many physical properties like piezo- or pyroelectricity, or nonlinear optical behaviour.  On the other hand the local symmetry of transition metal ions influences the energy of electron orbitals and, as a consequence, absorption of electromagnetic radiation as well as luminescent and magnetic properties. Therefore directing the synthesis towards particular symmetry of the solid product can allow control over the properties of resulting material. The aim of our current research includes the deeper understanding of the relation between the symmetry of the used building blocks and the symmetry of the products obtained in the self-assembly process. We also attempt to obtain products with high symmetry of the crystal lattice. It is quite a challenge for crystal engineering because highly symmetrical building blocks do not often yield highly symmetrical products. Such phenomena as partial dissociation, solvatation, intermolecular interactions or improper stoichiometry may render al efforts unsuccessful. Apart from inorganic compounds, where cubic system is quite common, in all other compounds the monoclinic and triclinic systems dominate. The most common orthorhombic group is adapted by c.a. 10% of structures, mostly chiral compounds, and the trigonal, tetragonal and hexagonal systems are the most rare.
In order to obtain the required features of the products we combined highly symmetrical organic molecules with various salts of 3d-elements. The inorganic component is introduced to improve stability of the compound as well as interesting electronic properties. We successfully obtained several new compounds, some of them belonging to high-symmetry space groups. The methodology, the structures and some interesting properties of the products will be presented.References:
 Newnham, R. E. (2004), Properties of materials, Oxford University PressKeywords: symmetry, crystal engineering, magnetic properties