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(PF6)4), were prepared from 1,4-bis(bromomethylbenzene) and
4,4′-bipyridine followed by ion exchange according to the
procedure reported in the literature3.
1,1′-[1,4-Phenylenebis(methylene)]bis-4,4′-bipyridinium-
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at room temperature for 24 h a suspension of the zeolite Y in
its Na+ form (1 g) in an aqueous solution of 12+Br2 (0.3 g).
After exchange the solid was filtered and dried. The final 12+
content was measured by thermogravimetry (C,N) (Neztch
thermobalance operating under air stream using Kaolin as
standard) and the percentage of ion exchange was determined
to be ((12+
)0.94Na51Si139O384). The solid was analyzed by diffuse
reflectance UV-Vis, FT-IR and MAS 13C NMR.
Cyclobis-(N,N′-paraquat-p-phenylen)-Y (24+@Y). A solu-
tion of 1,4-bis(bromomethyl)benzene (0.19 g) in CH2Cl2 (30
mL) was added to the partially exchanged 12+@Y (3 g)
previously dehydrated by heating it in an oven at 110 °C for 5
h. The suspension was stirred at reflux temperature for 24 h.
More 1,4-bis(bromomethylbenzene) (0.078 g) was added and
the reaction mixture was refluxed for an additional 40 h. Then
the solid was filtered and submitted to exhaustive solid-liquid
extraction using a micro-Soxhlet equipment and CH2Cl2 as the
solvent. The extracted solid was analyzed by diffuse reflectance
UV-Vis, FT-IR and MAS 13C NMR.
CT Complexes of 12+@Y and 24+@Y with 1,4-dimethoxy-
benzene (DMB). 12+@Y and 24+@Y were dehydrated heating
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Acknowledgment. Financial support by the Spanish DGES
(H.G., Grant No. MAT2000/1768-CO2-01) and Canadian
NSERC (J.C.S.) is gratefully acknowledged. H.G. and B.F. are
indebted to the Spanish Ministry of Education for a fellowship
to support his stay at Ottawa and a postgraduate scholarship,
respectively.
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References and Notes
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Int. Ed. Engl. 2000, 39, 3348.