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Monomers of maleic hydrazide (3-hydroxypyridazin-6-one) were studied using the experimental matrix-isolation technique as well as DFT and QCISD methods of quantum chemistry. The oxo-hydroxy tautomer was theoretically predicted to be the most stable form of the compound. The energies of the dihydroxy and dioxo forms were calculated (at the QCISD level) to be higher by more than 20kJmol −1 ...
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