Mo-Kα radiation (λ = 0.71073 Å). Data acquisition was performed using Bruker APEX2, cell refinement and data reduction were performed using Bruker SAINT and numerical absorption correction was performed using Bruker SADABS. Structure solution was performed with SHELXS97 and refinement with SHELXL2018/3. Further details of the respective refinements may be found in the cif in the online repository. Guinier diffraction measurements were performed using a Huber Guinier diffractometer with Mo-Kα 1 radiation (λ = 1.54096 Å) and a closed-circle He-cooled cryosystem. Patterns were collected every 10 K in a heating cycle with cumulative measurement times of 600 s for every data point.