**2.7 Single-crystal-to-single-crystal anion exchange in a GadoliniumMOF: incorporation of POMs and [AuCl]**

The exemplification of useful atoms inside permeable coordination polymers (otherwise called metal-natural structures, MOFs) has happened to incredible enthusiasm for ongoing years at the field of multifunctional materials. In this article, we present an investigation of the impacts of size and charge in the anion trade procedure of a Gd based MOF, including atomic species like polyoxometalates '(POMs) and [AuCl4] <sup>−</sup>. This post-manufactured modification has been described by IR, EDAX, and single precious stone diffraction, which have given unequivocal proof of the area of the anion atoms in the structure [13] (**Figures 7** and **8**).
