reveal that the urea or thiourea groups form an intramolecular hydrogen bond with the pyrazole group resulting in an anti conformation. This prevents formation of gels except in one case. The gelation of 1 (3 methyl 1H pyrazol 5 yl) 3 (3 nitrophenyl)urea in acidic water overcomes this problem by protonation of the pyrazole group resulting in a syn conformation of the urea group. Electronic measurements show these materials are semiconductors while SQUID magnetometry measurements suggest these materials order antiferromagnetically at low temperatures. Chapter 5 reports the synthesis of an extended family of ternary oxychalcogenides with A4O4Se3 composition. Three new structures for this composition have been solved using a combination of single crystal and powder X ray diffraction. Les classes de 3me maternelle
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