The data refers to experiments with the molecular rotor 9-(2-Carboxy-2-cyanovinyl) (CCVJ) in ethylene glycol and analysis of its suitability for use in photoisomeric Molecular Tagging Velocimetry (MTV). The data is structured in zip packages for the different experiments. The packages are structured following the published article, where detailed information on the experimental setup can be found. Each zip package contains a separate README with detailed information on the data structure. The six packages contain: Diffusion coefficient: Measurement for the determination of the diffusion coefficient High time difference: Measurements of a Poiseuillle flow with the maximal duration up to 720s Methyl-beta-CD: Flow measurements with different concentration of Methyl-beta-cyclodextrin Poiseuille flow: Measurements of a Poiseuille flow up to 200s Recovery time constant: Measurements for the determination of the recovery time constant τrec Tagging time constant: Measurements for the determination of the tagging time constant τtag Version 2.0.0 includes updated data for the diffusion coefficient experiments.