In "situ study" of the UiO-66 and UiO-67 Metal Organic Frameworks crystallization.

Metal-organic framework: indeed, this new hybrid class of porous material have shown several advantages over the purely organic and inorganic classical porous material. Several structures are already reported, and the potentiality of creating new structures tends to infinity. The high porosity and absence of hidden volume gave them popularity as adsorbent. The development of high-performance and conceptually innovative catalytic nanomaterials is crucial for industry. In order to build the structure-property relation for any material detailed characterisation is of prime importance; particularly in the field MOFs, the possibility of creating new structures is very high. The detailed characterisation of the material not only will help to build structure-property relation but also assist in design synthesis to obtained new materials with good performance. In order to fulfil this requirement the combination of different characterisation techniques is essential. MOFs are crystalline and microporous and therefore frequently they are characterised by X-ray diffraction and Raman spectroscopy The combination of these two techniques in principle could give relevant information related to the synthesis of the material. XRD could give the information about the crystallinity and the structure of the material. Raman spectroscopy could provide the information concerning the vibrational modes of the reactants, intermediate and final products. It is well known for the MOFs that the storage capacity is directly depends on the surface area. In our study of the two MOFs: UiO-66 and UiO-67 (without open metal sites).