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Cambridge Crystallographic Data Centre as supplemen-
tary publication nos. CCDC 272989 and 272990. Copies
of the data can be obtained, free of charge, on application
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Acknowledgements
The authors thank FONACIT (Venezuela) for financial
support to V.L. (Doctoral Fellowship and Project S3),
FONACIT and CNR (Italy) for an International Cooper-
ation Grant and the European Community through the
MCRTN program AQUACHEM (Contract MRTN-CT-
2003-503864) for promoting this scientific activity. Thanks
are also expressed to ‘‘FIRENZE HYDROLAB’’, a project spon-
sored by ECRF. We also thank Mr. D. Masi for collecting
the X-ray diffraction data of 2 and Dr. P. Barbaro for run-
ning some NMR spectra.
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