| Vibrational Spectroscopy - Modern Trends | Florence (Italy) 1976 |
| XIV European Congress on Molecular Spectroscopy - Modern Trends in Spectroscopy | Frankfurt/Main 1979 |
| Transition Metal Chemistry: Current Problems and the Biological as well as Catalytical Relevance | Bielefeld 1980 |
| Matrix Isolation Spectroscopy | Montpellier (France) 1980 |
| Nitrogen Fixation: The Chemical-Biochemical-Genetic Interface | Bielefeld 1981 |
| Sulfur: Its Significance for Chemistry, for the Geo-, Bio-,and Cosmosphere and Technology | Bielefeld 1983 |
| Metal Active Sites in Biology and their Synthetic Analogues | Le Bischenberg (France), 1988 |
| Electron and Proton Transfer in Chemistry and Biology | Bielefeld 1990 |
| Polyoxometalates: From Platonic Solids to Anti-Retroviral Activity | Bielefeld 1992 |
| Phenomena: From Simple Material (Chemical) Systems to Complex Ones | Bielefeld 1993 |
| Information, Interaction, Emergence: A Possible Access to the Conceptual Order of Reality (Facts from Natural Sciences, Thoughts from Natural Philosophy) | Bielefeld 1994 |
| Causality, Selforganization, and Computability: Interdisciplinary Approaches of Physics, Chemistry, Biology, and Philosophy | Bielefeld 1995 |
| Recent Progress in Polyoxometalate Chemistry | Paris (France) 1996 |
| Natura Naturans - Topoi of Emergence | Bielefeld 1997 |
| From Large Molecules to Nanostructures | Paris (France) 1997 |
| Clusters, Cages and Giant Molecules: Structure and Function. Can Discrete Mathematics help? | Bielefeld 1997 |
| Chemistry what for? - A View into the Next Century | Bielefeld 1998 |
| Heteropolyacids | Paris (France) 1998 |
| Polyoxometalate Chemistry with Interdisciplinary Aspects: From Topology to Industrial Applications | Bielefeld 1999 |
| Aspects of Modern Inorganic Chemistry Nucleation, Self Assembly, Biomineralization, Crystal Growth |
Paris (France) 2000 |
| Public Understanding of Science | Bielefeld 2001 |
| Polyoxometalates: New Perspectives | Paris (France) 2001 |
| Synthetic Strategies for Spin-Topologies | Paris (France) 2002 |
| Molecular Materials: From Synthesis to Application | Paris (France) 2002 |
| Geometry and Chemistry: Discrete and Periodic Structures | Bielefeld 2003 |