Abstract
Calorimetric studies were carried out for the ferrimagnetic molecule-based material N( n-C 4H 9) 4[Co IIFe III(ox) 3]. The magnetic transition was detected at 29.7 K, along with a small heat capacity hump around 12 K. A broad phase transition centred at 210 K was observed due to an order–disorder mechanism owing to increasing conformational change of the N( n-C 4H 9) 4 + cation. The enthalpy and entropy gains corresponding to the heat capacity anomalies were estimated. The sum of the entropy gains at the 29.7 and 12 K anomalies was close to the expected magnetic entropy R ln (6×4). This indicated that the heat capacity anomaly around 12 K has magnetic origin.
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