SYNTHESIS AND STRUCTURES OF PYRIDINOLOGOUS LINEAR TRIPYRROLE AND TETRAPYRROLE METAL-COMPLEXES

The Cu(II) complexes of a pyridinologous tri- and tetrapyrrole ligand which have recently been shown to be catalytically active were investi gated by X-ray crystallography together with the Ni(II), Co(II), and Z n(II) complexes of the first ligand. These ligands displayed an astoni shingly variable complexation behavior which uniquely allows to accomm odate specific ligand field demands of a certain metal ion. This behav ior seems to be an ideal prerequisite to provide catalytically active systems.