Synthesis of Well-defined Solid Catalysts by Surface Organometallic Chemistry - Atomically-Precise Methods for Synthesis of Solid Catalysts - page 22

catalytic cycle by adding a reaction of the amido imido complex with an
organic moiety. Further studies in this direction are in progress.

1.8 Conclusion
In the course of this short review we have shown that it is possible to
prepare well-defined organometallic fragments on an oxide surface. Only
one species can be obtained on the surface when choosing the right con-
ditions. This surface complex can further react with various molecules,
leading to active species for a lot of reactions including the activation of
alkanes, as species unknown in solution can be stabilized by the surface.
The nature and the structure of the support on which the organometallic
fragment will be grafted will have an effect on the conditions where only
one species is observed and on the presence of different species after
subsequent reactions of the grafted complex. For example, flame silica will
lead to monografted complexes after dehydroxylation at a lower tempera-
ture than a mesoporous silica. The heterogeneity of the hydroxyl distri-
bution has no effect on the grafting reaction but is important for the
synthesis of surface hydrides by hydrogenolysis, as two species will be
obtained. In all cases this approach allows the obtention of one or only few
surface species with a well-defined coordination sphere around the metal,
allowing structure-activity relationships to be performed. This method can
also allow a predictive approach for the design of catalysts for a given re-
action to be obtained.

d n 9 r 4 n g | 1

.

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