Zeolites coordination chemistry

The work has largely focused on the coordination chemistry of transition metal ions (i.e., on the description of the nature and symmetry of their environments) (Section 2.1), in line with other spectroscopies, mainly optical (UV-vis), magnetic (EPR and NMR), which take advantage of partly filled d orbitals, and structural (EXAFS) (Sojka and Che, 2009). It has even become possible with PL via well-resolved fine structures to determine the extent of distortion of the environment of tetrahedral species (e.g., vanadium species in zeolites (Section 2.1.2)). It is likely that such information combined with that derived from other spectroscopies, vibrational on one hand, such as IR and Raman, and electronic on the other hand, such as EPR, will be applied by theoreticians to further improve the existing models and our understanding of the nature and role of surface species involved in catalytic processes. 

Several polydentate N-ligands were shown to make macrocyclic poly aza complexes in the supercages of FAU-typc zeolites [7, 48]. In order to fully understand the coordination chemistry of Ni2 and Co2+, ESR, UV-VIS-NIR, Raman, and magnetic techniques were applied. The formation of [Co(II)cyclam]Y is clearly established, the cis... 

Coordination chemistry in zeolites. In Herron N, Corbin DR (eds) Inclusion... 

Ammonia Oxidation with Pt + Ion-Exchanged Zeolite Catalysts Catalysis Through Coordination Chemistry... 

The coordination complex chemistry in zeolites provides a very useful conceptual bridge to coordination-chemistry controlled catalysis in the liquid phase. This is discussed in this chapter for the oxidation of ethylene to produce vinyl acetate from acetic acid and ethylene. The catalytic system appears to consist of dimeric or trimeric Pd complexes. The elementary reaction steps can take place in the direct contact with the metal centers, the so-called inner-sphere mechanism. The reaction can also proceed through an outer-sphere mechanism in which proton transfer between reactants and acetate plays an essential role. 

Alberti K, Petting F (1994) Zeolites as sensitive materials for dielectric gas sensors. Sens Actuators B Chem 21 39-50 Ariga K, Vinu A, Hill JP, Mori T (2007) Coordination chemistry and supramolecular chemistry in mesoporous nanospace. Coord Chem Rev 251 2562-2591... 

Another interesting feature of MOFs concerns the number of cations that can participate in the framework. Indeed, compared to inorganic ones [3], which are more based on a few cations (Si and A1 for zeolites, eventually doped with some transition metals, with the exception of titanosilicates [119] Zr, Al, Ga, In phosphates and arsenates, sometimes fuUy substituted by transition metals Ti [72], V [120], Fe [121,122], Co [123,124], Ni [125], Zn [126,127]), MOFs can accept almost all the cations of the classification, at least those which are di-, tri- (including rare earth) or tetravalent. Keeping in mind the tremendous number of species previously isolated in coordination chemistry, this provides a huge number of possibilities for creating new MOFs. 

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