Differential Scanning Calorimetry Study of Fluoride Complexes of Chromium, Iron, Boron, Aluminum, Indium and Phosphorus(Chemistry)

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The enthalpy and temperature of the sublimation, dissociation and transition of nitrosyl fluoride or nitryl fluoride - chromium, iron, boron, aluminum, indium and phosphorus fluoride adducts were determined from DSC measurements. These adducts were produced using the 80 mol% HF-20 mol% NO_2 solvent. The following facts were found from the DSC measurements of these adducts. NOCrF_4 and NOFeF_4 are converted into CrF_3 and FeF_3, respectively, through two thermal dissociation steps. Three and one thermal dissociation steps are observed for the reaction of (NO)_2Al_3F_<11> and (NO)_2In_3F_<11>, respectively, to the final forms of AlF_3 and InF_3. NOPF_6 sublimates without preceeding reaction, but in the case of NO_2BF_4, thermal dissociation into NOBF_4 and transition are observed prior to its sublimation.
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