The nanoindentation test results for 1 (Figures and) revealed a Young's modulus (Er) and hardness (H) of 1.8(2) and 0.072(3) GPa, respectively. Furthermore, the Young's modulus of 1 upon bending was determined to be 0.13 GPa (Figures ). These values are lower than those of most organic compounds , confirming the high flexibility of 1. Figure summarises the crystal packing of 1 at 298 K. 1 crystallised in the space group P-1, and the entire molecule was crystallographically independent. The two dodecyl chains of 1 exhibited heavy disorder at 298 K, as indicated in green, orange, and purple. The porphyrin molecules stacked along the a-axis to form a columnar structure surrounded by dodecyl chains. The a-axis coincided with the direction of crystal growth. Needle-like crystals with such a one-dimensional molecular arrangement are commonly elastic. The intracolumnar distances between porphyrin π-planes (3.67 and 3.82 Å) are longer than that expected for a π-π stacked system (3.3 Å), indicating that the van der Waals interactions between dodecyl chains are the dominant driving force behind the one-dimensional packing of the crystals (Figure ). Figure summarises the temperature dependence of the a-axis length as a representative parameter. When the temperature was swept from approximately 275 to 223 K, the a-axis length gradually increased with the gradual suppression of the disorder on the dodecyl chains (Figure ). The crystalline parameters exhibited a similar temperature dependence during the corresponding heating process, indicating that this process is reversible. Adiabatic and differential scanning calorimetry indicated that the gradual structural changes observed between 275 and 223 K correspond to a second-or higher-order phase transition from the high-temperature (HT) to the low-temperature (LT) phase (see the thermal analysis section in the Supporting Information (SI)).