{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T08:58:17Z","timestamp":1785488297804,"version":"3.56.0"},"reference-count":72,"publisher":"American Chemical Society (ACS)","issue":"29","license":[{"start":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T00:00:00Z","timestamp":1784246400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"EU H2020 ERC AdG","award":["692981"],"award-info":[{"award-number":["692981"]}]},{"name":"Ministero dell?Universit? e della Ricerca","award":["2022KMMAYM_002"],"award-info":[{"award-number":["2022KMMAYM_002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,7,29]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Developing photoresponsive molecular materials that couple efficient charge transport with robust photoswitching remains challenging because structural features enhancing one function often compromise the other. In this study, two homologous series of arylazo oligothiophenes and oligothienoacenes\u2013in which an azo photoswitch is directly conjugated to a \u03c0-extended thiophenic scaffold\u2013were systematically investigated. Ultraviolet\u2013visible (UV\u2013vis) spectroscopy combined with theoretical calculations shows that, in solution, \u03c0-extension enables E \u2192 Z photoisomerization using visible light but concurrently lowers the barrier for thermal Z \u2192 E back-conversion by activating rotational isomerization pathways. Aryl fluorination counteracts this effect by strengthening intramolecular S(n)\u00b7\u00b7\u00b7\u03c0 interactions, extending the Z-isomer half-life from minutes to hours. In the solid state, \u03c0-extension promotes dense intermolecular packing that inhibits photoisomerization. Introduction of a bulky trityl group reduces packing density, as revealed by single-crystal analysis, restoring E \u21c6 Z photochromism in crystalline thin films and inducing a crystalline-to-amorphous transformation, as evidenced by X-ray diffraction (XRD) and microscopic analysis. The resulting light-driven molecular and morphological reorganization enables reversible, light-induced modulation of electrical conductivity in two-contact planar devices. Space-charge-limited-current measurements show that conductivity changes correlate with isomer-dependent electron mobility properties. Overall, these findings establish \u03c0-extended azo-thiophene scaffolds as a versatile platform to couple photochromism and morphological reorganization with charge transport phenomena.<\/jats:p>","DOI":"10.1021\/jacs.6c06319","type":"journal-article","created":{"date-parts":[[2026,7,17]],"date-time":"2026-07-17T12:02:38Z","timestamp":1784289758000},"page":"31020-31031","source":"Crossref","is-referenced-by-count":0,"title":["Coupling Photochromism\nand Charge Transport in \u03c0-Extended\nArylazo Oligothiophenes and Oligothienoacenes"],"prefix":"10.1021","volume":"148","author":[{"given":"Chiara","family":"Taticchi","sequence":"first","affiliation":[{"name":"Alma Mater Studiorum\u2500Universita\u0300 di Bologna , , Via Gobetti 85 , ,","place":["Bologna, Italy, 40129"]},{"name":"Center for Light Activated Nanomaterials (CLAN) , via Gobetti 101 , ,","place":["Bologna, Italy, 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