Source data for: Onset and Morphological Evolution of Cooperativity in Glass-Forming Liquids Composed of Anisotropically Shaped Molecules

This dataset contains dielectric, calorimetric, and thermogravimetric data associated with the article “Onset and Morphological Evolution of Cooperativity in Glass-Forming Liquids Composed of Anisotropically Shaped Molecules” published in The Journal of Physical Chemistry Letters, 2025, 16 (31), 7953–7959 (https://doi.org/10.1021/acs.jpclett.5c01863).The dataset includes experimental data collected for two anisotropic glass-forming molecules, denoted RM1 and RM4. These molecules consist of two dibutylfluorene segments linked by acetylene bridges and incorporate either a fluorophenylene (RM1) or a difluorophenylene (RM4) unit.The raw data were obtained using the following experimental techniques: (1) broadband dielectric spectroscopy (BDS) over a wide frequency and temperature range, (2) differential scanning calorimetry (DSC), and (3) thermogravimetric analysis (TGA).The dataset contains the experimental data used to generate Figures 1–3 in the associated publication and provides the basis for the analysis reported in the article.