Identification of supramolecular structure in a semiconductor mixture of two organic compounds: curcumin and paracetamol

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This study refers to experimental investigations about the semiconductor material (P-wt50%/C-wt50%)-mw obtained from pure curcumin and paracetamol starting molecules when physically mixed together and treated by microwaves in water. After some analysis aimed to understand the chemical structure of the resulting (P-wt50%/C-wt50%)-mw mixture performed by 1H- and 13C-NMR techniques, some more FT-IR and UV–Vis analysis have been performed in order to investigate deep the way in which the precursors interact each other in the bulk semiconductor system. After the explanation that only admitting the existence of a peculiar supramolecular structure among the two pure materials, our study proceeded performing some morphological analysis. The SEM observations obtained so far show the presence of flaking planes which could slide on each other and, as consequence, could be responsible for the pronounced semiconducting properties shown by (P-wt50%/C-wt50%)-mw mixture. XRD spectra show a modification of the crystal organization of the mixture when obtained in the presence of microwaves.