Res. Chem. Intermed.
, Vol. 30, No. 9, pp. 857–869 (2004)
Also available online - www.vsppub.com
Is water really deleterious for organometallics anchoring
ERICA C. DE OLIVEIRA
and HELOISE O. PASTORE
Instituto de Química, Universidade Estadual de Campinas, CP 6154, CEP 13083-970,
Campinas, SP, Brazil
Received 16 June 2004; accepted 6 August 2004
Abstract—Anchoring of [(η
)] into cavities of Na
Y zeolites was
studied. In contrast to expectation, the zeolite degree of hydration is not a key factor in the
organometallic structural integrity. The thermal behavior of the occlusion reaction is the same when
the zeolites are completely or partially dehydrated, showing that total absence of water is not a
necessary condition to prepare an organometallic/zeolite system. For the zeolite Na
Y the product
is the organometallic fragment [(η
)Rh] which anchors to the oxygen atoms of the framework,
while for the H
Y zeolite the product is a cationic organometallic species.
Keywords: Anchoring; faujasite; organometallic.
The architecture and topology of zeolite make them attractive catalysts supports be-
cause of their well-deﬁned channels and pores, large internal surface area and high
thermal stability . Moreover, the zeolitic environment presents effects of high in-
ternal electrostatic ﬁelds, due to extra-framework cations, Brønsted and Lewis acid
sites that behave differently whether the zeolite is hydrated or dehydrated .
In this way, a wide variety of metal clusters, organometallic and coordination
compounds have been encaged and organized on the internal surface of different
zeolite structures taking advantage of these very well deﬁned sites. The nanoreac-
tors thus formed have properties different from the initial species individually (the
zeolite host and the guest species) [3–5]. Among the most commonly used zeolites,
the faujasite structure of Y zeolite has been specially studied.
The systems formed from anchoring special chemicals at the inner surface of
zeolites aim at joining the advantages of homogeneous and heterogeneous catalysts,
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