Abstract

Abstract 5-Nitrofuran-2-aldoxime (1b) exhibits crystallographic polymorphism. The isolated two crystals show SHG efficiency of 12 and 3 times that of urea. 5-Nitrothiophene-2-aldoxime (2b) shows weak SHG response because of the hyper valent interactions of O–S–O atoms. Two crystals of 1b and 2b belong to P212121 space group.

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