UV–Vis spectroscopy dataset of spiropyran photochromic systems for MOST applications

UV–Vis Spectroscopy Dataset of Spiropyran Photochromic Systems for Molecular Solar Thermal Applications Overview This dataset contains UV–Vis spectroscopic measurements associated with the study: “Triggering on demand of the return reaction of photochromic molecules.” The experiments investigate the photochromic behaviour and thermal relaxation kinetics of two spiropyran derivatives under different acidic conditions. These systems are explored as candidates for Molecular Solar Thermal (MOST) energy storage, where solar energy is stored in metastable molecular states and released as heat. Dataset contents: Raw UV–Vis absorption spectra Time-resolved kinetic measurements Molecules Investigated Nitro Spiropyran (NO₂-SP) IUPAC: 1′,3′-Dihydro-1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-(2H)-indole] CAS: 1498-88-0 Methoxy-Nitro Spiropyran (MeO-NO₂-SP) IUPAC: 1′,3′-Dihydro-8-methoxy-1′,3′,3′-trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′-[2H]indole] CAS: 1498-89-1 Acids PTSA (p-toluenesulfonic acid) H₃PO₄ (phosphoric acid) Molecular Forms and Notation A : Spiropyran (closed form) AH : Protonated spiropyran B : Merocyanine (open form) BH : Protonated merocyanine Experimental Sequences A–B–A A–B–BH–B–A A–B–BH–AH Only the final transformation step was used for recorded spectra. Example: A–B–A → analysis of B → A File Naming Convention Molecule_Sequence_Acid_Experiment Examples: NO2_SP_A-B-A_none_exp1.csv NO2_SP_A-B-BH-B-A_PTSA_exp2.csv MeO_NO2_SP_A-B-BH-B-A_H3PO4_exp1.csv License This dataset is distributed under the Creative Commons Attribution 4.0 (CC-BY-4.0) license. Contact Authors: Bellenger Maxence Coulon Martin Feck Hugo Noc Rodrigue Steiner Sloan Research mentors: Rémi Métivier Keitaro Nakatani For questions regarding the dataset or experimental procedures, please contact the authors of the associated study.