**Low-dimensional Inorganic and Hybrid Organic-Inorganic magnetic systems**

We develop different techniques for the quantitative analysis of magnetic interactions in low dimensional compounds ( 0D , 1D, 2D ) from the experimental magnetic measurements . We were particularly interested in hydroxynitrates series of transition metals that have proven to be very good model compounds to understand the effects of structure and spin dimensionality and of the anisotropy on the behavior of 1D or 2D magnetic systems with competing interactions. This type of analysis of the relationship between structure and property is extended to various coordination networks (from finite molecules to MOFs) synthesized in our team or interesting colleagues from other laboratories. Some literal expressions of the magnetic susceptibility for complex chains have been established and are used in the literature. Our approach is sometimes supplemented by DFT calculations of the electronic structure of the solid. We are currently interested in the magnetism of the f electrons ions.^{1}