All members of CTMM are theoreticians or computational chemists using quantum approaches in their research. The aim of CTMM is to develop methods and concepts to analyze the physico-chemical properties and the chemical transformations occuring in molecular chemical systems and materials. The topics covered span a large spectrum from small molecular quantum dyhnamics, to the structure and reactivity of transition metal complexes, and to the electronic properties of organic and inorganic solids. All the theoretical studies are carried out in synergy with experimental groups.