{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T15:54:39Z","timestamp":1792598079742,"version":"4.5.0"},"reference-count":72,"publisher":"American Chemical Society (ACS)","issue":"41","license":[{"start":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T00:00:00Z","timestamp":1791763200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000781","name":"European Research Council","doi-asserted-by":"publisher","award":["101040681"],"award-info":[{"award-number":["101040681"]}],"id":[{"id":"10.13039\/501100000781","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003407","name":"Ministero dell?Istruzione, dell?Universit? e della Ricerca","doi-asserted-by":"publisher","award":["PE0000021"],"award-info":[{"award-number":["PE0000021"]}],"id":[{"id":"10.13039\/501100003407","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/na","name":"H2020 Marie Sklodowska-Curie Actions","doi-asserted-by":"publisher","award":["956270"],"award-info":[{"award-number":["956270"]}],"id":[{"id":"10.13039\/na","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,21]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Two-dimensional tin perovskites are attracting increasing attention for coherent light emission, yet the impact of organic cations on their properties remains poorly understood. Here, we compare the Ruddlesden\u2013Popper (RP) butylammonium tin iodide (BA2SnI4) and Dion\u2013Jacobson (DJ) 1,4-diammoniobutane tin iodide (DABSnI4) perovskites to investigate the impact of the two structural types on their photophysical and optical gain properties. Combining X-ray diffraction and solid-state NMR spectroscopy, we reveal the different templating properties of the mono- and ditopic cations on the long-range structural order and local coordination environment, identifying an unreported phase transition for DABSnI4. The constrained molecular motions in the DJ perovskite provide an increased structural rigidity that also suppresses vibrational modes of the inorganic sublattice. The consequent lower exciton\u2013phonon coupling and exciton binding energy, reduced defectivity, and modulation of the exciton recombination dynamics create favorable conditions to stabilize the population inversion and achieve amplified spontaneous emission (ASE) in DABSnI4, in net contrast with BA2SnI4 where ASE could not be obtained. This work highlights that Dion\u2013Jacobson perovskites can create more rigid structural environments with positive feedback on the photophysical properties, providing a simple but effective design strategy for the synthesis of improved materials for optoelectronic applications.<\/jats:p>","DOI":"10.1021\/jacs.6c14883","type":"journal-article","created":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T20:01:54Z","timestamp":1791835314000},"page":"44876-44888","source":"Crossref","is-referenced-by-count":0,"title":["Structural Rigidity\nEnables Amplified Spontaneous\nEmission in 2D Alkylammonium Tin Perovskites"],"prefix":"10.1021","volume":"148","author":[{"given":"Francesca","family":"Canestra","sequence":"first","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-1599-8794","authenticated-orcid":true,"given":"Nurgul","family":"Sarsembek","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-0093-2937","authenticated-orcid":true,"given":"Yarong","family":"He","sequence":"additional","affiliation":[{"name":"Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia , via Rubattino 81 , ,","place":["Milano, Italy, 20134"]},{"name":"Politecnico di Milano , , ,","place":["Milano, Italy, 20133"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Pianetti","sequence":"additional","affiliation":[{"name":"Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia , via Rubattino 81 , ,","place":["Milano, Italy, 20134"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martina","family":"Santarelli","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Silvia","family":"Contessi","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40138"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ranita","family":"Samanta","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martina","family":"Zangari","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federico","family":"Brivio","sequence":"additional","affiliation":[{"name":"University of Padova , , Via Francesco Marzolo 8 , ,","place":["Padova, Italy, 35131"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9737-2809","authenticated-orcid":true,"given":"Tommaso","family":"Salzillo","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4317-6543","authenticated-orcid":true,"given":"Cristina","family":"Femoni","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6914-4537","authenticated-orcid":true,"given":"Annamaria","family":"Petrozza","sequence":"additional","affiliation":[{"name":"Center for Nano Science and Technology @Polimi, Istituto Italiano di Tecnologia , via Rubattino 81 , ,","place":["Milano, Italy, 20134"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8623-9191","authenticated-orcid":true,"given":"Daniele","family":"Cortecchia","sequence":"additional","affiliation":[{"name":"University of Bologna , , ,","place":["Bologna, Italy, 40129"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,12]]},"reference":[{"issue":"2","key":"2026102111084992700_cit1","doi-asserted-by":"publisher","first-page":"927","DOI":"10.1021\/acsenergylett.2c02802","article-title":"Ultrathin Light-Emitting\nDiodes with External Efficiency over 26% Based on Resurfaced Perovskite\nNanocrystals","volume":"8","author":"Wan","year":"2023","journal-title":"ACS Energy Lett."},{"issue":"12","key":"2026102111084992700_cit2","doi-asserted-by":"publisher","first-page":"7444","DOI":"10.1021\/acs.chemrev.9b00107","article-title":"Perovskites for\nNext-Generation Optical\nSources","volume":"119","author":"Quan","year":"2019","journal-title":"Chem. 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