Cooperative effects such as ferro- or antiferromagnetic interactions are accessible through tailor-made molecular structures of linearly arranged paramagnetic complexes. Since it is well-known that subtle changes in the molecular structure can cause distinct changes in the magnetic interaction, the inter-metal distances were varied as well as the number of stacked complexes. In addition the metal centers were changed in order to vary the numbers of interacting unpaired electrons. The final target was an investigation of the properties of stacked magnetic molecules on a substrate.