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Structural Chemistry - The nucleophilic aromatic substitution reactions of 4,6-dinitroisoindoline-1,3-dione with 1,2,3-triazole isomers, i.e., 1H-1,2,3-triazole and 2H-1,2,3-triazole, have been...  相似文献   
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Very high purity single crystals have been successfully grown by the method of vertical zone refining. The problem of excessive evaporation of the material, confronted by the earlier workers, has been successfully overcome. The purity of the crystals has been tested by D. C. conductivity measurements and further confirmed by U. V. spectroscopy. X-ray diffraction has been employed for the characterization of the crystals. The crystals have been found to crystallize exclusively in 6R polytypic modifications, without any arcing and streaking on their X-ray photographs. The results have been discussed in relation to the effect of impurities on polytype formation.  相似文献   
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