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1831
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was dried over anhydrous magnesium sulfate and evapo-
rated (15 Torr) to give a residue, which after purification
by preparative TLC (silica gel, hexane/EtOAc) yielded
the target pure azo compound. All the products are known
compounds and were characterised by comparison of their
physical and spectroscopic data with those of commercially
availables samples or literature data. The TEM image was
recorded at the TEM service of the University of Alicante
(Spain) using a JEOLJEM2010 microscope, equipped with
a lanthanum hexaboride filament, operated at an accelera-
tion voltage of 200 kV.
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Acknowledgements
We wish to thank the financial support from the CON-
ICET (Project PIP 5104) and SGCyT-UNS (Project PGI
24/Q026) from Argentina. Y.M. also thanks the CONI-
CET for a doctoral fellowship. The authors are very grate-
ful to Dr. F. Alonso for helpful discussions, and the
´
´
Servicios Tecnicos de Investigacion of the University of
Alicante (Spain) for TEM analysis.
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