A TMA 402 Hyperion (Netzsch, Germany) thermomechanical analyzer was used to monitor the change in sample height upon cyclic heating and cooling. For this, 30 mg of CuBTC and [EMIM][TFSI]@CuBTC were pressed at 0.5 tons using a 5 mm diameter die for 1 min. For data correction, a reference run was conducted using two parallel alumina discs. Sample scans were performed by placing the pressed pellet between the alumina discs and applying a constant vertical force of 0.1 N. The sample was heated to 250 °C and cooled to 40 °C with a heating and cooling rate of 5 °C min -1 while monitoring vertical dilation. A continuous nitrogen flow of 20 ml min -1 was applied during the experiment.