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The most stable oxo-hydroxy form of maleic hydrazide was
found to be exclusively populated in low-temperature Ar matrices.
Upon irradiation with UV light with waves longer than 250 nm this
form was photostable. Only upon UV (k > 234 nm) irradiations,
providing considerable excitation energy excess, unimolecular
photoreactions of maleic hydrazide occurred. Two channels of
UV-induced transformations were observed for maleic hydrazide:
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Acknowledgments
This work was partially supported by the Portuguese ‘‘Fundação
para a Ciência e a Tecnologia’’ (FCT), Research Projects PTDC/QUI-
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Appendix A. Supplementary material
Supplementary data available for the lists of internal coordi-
nates used in the normal mode analyses of MH isomers Ia
(Table S1), IIa (Table S2), and NAMI (Table S3). Supplementary data
associated with this article can be found, in the online version, at
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