Infrared spectroscopic investigation of the formation of adducts of Fe-phthalocyanine with hydrazine and ammonia
Abstract
The predominant effect of the interaction of hydrazine (N2H4) with metal phthalocyanines (MPcs) is catalytic decomposition of N2H4 forming NH3 and N2. With FePc, in parallel, both physisorption and adduct formation, the latter involving the total bulk of FePc, can be observed by i.r. spectroscopy. The FePc–N2H4 adduct is formed with α-FePc and β-FePc as well. The reaction rate is several orders of magnitude higher in the reaction with α-FePc; in vacuum at temperatures below 450 K, the adduct decomposes reforming α-FePc. Hence, the adduct resembles the structure of α-FePc rather than that of β-FePc.
The adduct between FePc and NH3 is formed starting from β-FePc only; it decomposes in vacuum to β-FePc, even at temperatures well below the temperature of the α–β transition. Hence, the structure of FePc–NH3 resembles more the structure of β-FePc.
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