Abstract
Abstract The heat capacities of deuterated bis (n 5-cyclopentadienyl) iron [Fe(C5D5)2: ferrocene-d10 for short] have been measured between 13 and 300 K with an adiabatic calorimeter. A A-type phase transition centered at 164.1 K with a subsidiary small peak at 172 K was found between the metastable low-temperature (LT) phase and the undercooled high-temperature (HT) phase. The stable LT phase exhibited a first-order transition to the HT phase at 251 K. The enthalpy and entropy of both the transitions were essentially the same as those of ferrocene-h10 whereas the temperature of the first-order transition shifted 9 K in comparison with ferrocene-h10. The heat capacity differences between ferrocene-d10 and -h10 for these three phases were well accounted for in terms of a change in the normal mode frequencies and the (Cp - Cv ) correction. As in the case of ferrocene-h10, ferrocene-d10 crystals showed a violent disintegration phenomenon with vast evolution of heat below the Λ-point.
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