vanadium complexes was used to explain the di†erence in
spectroscopic properties of the impregnated and encapsulated
samples as well as the signiÐcant size dependence of the EPR
parameters for the encapsulated samples. It was suggested by
XRD, as well as by comparative XPSÈXRF, studies that the
complexes were encapsulated in the zeolite supercages. The
18 K. Maruszewski, D. P. Strommen, K. Handrich and R. Kincaid,
Inorg.Chem., 1991, 30, 4579.
1
2
9
0
R. L. Dutta and S. Ghosh, J. Indian Chem. Soc., 1967, 44, 271.
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1
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2
2
2
2
2
2
3
4
5
6
Handbook of X-ray Photoelectron Spectroscopy, JEOL, Tokyo,
encapsulated VO(pic) complex retained solution-like activity
2
1
991, p. 12.
in the selective oxidation of hydrocarbons.
C. A. Trujillo, U. N. Uribe, P. P. Knops-Gerrits, L. A. A. Oviedo
and P. A. Jacobs, J. Catal., 1997, 168, 1.
C. Kirschhock and H. Fuess, J Chem. Soc., Faraday T rans., 1995,
This work was supported by CREST (Core Research for Evol-
utional Science and Technology) of JST (Japan Science and
Technology Corporation).
9
1, 1813.
Z. A. Kaszkur, R. H. Jones, D. Waller, C. R. A. Catlow and J. M.
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