{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T20:27:10Z","timestamp":1768940830723,"version":"3.49.0"},"reference-count":40,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2025,3,18]],"date-time":"2025-03-18T00:00:00Z","timestamp":1742256000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001843","name":"Science and Engineering Research Board","doi-asserted-by":"publisher","award":["CRG\/2022\/009230"],"award-info":[{"award-number":["CRG\/2022\/009230"]}],"id":[{"id":"10.13039\/501100001843","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["aces.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry \u0097 An Asian Journal"],"published-print":{"date-parts":[[2025,4,17]]},"abstract":"Abstract<\/jats:title>\n \n (TMA)\n 2<\/jats:sub>\n SnX\n 6<\/jats:sub>\n (TMA=tetramethylammonium; X=Cl, Br, I) compounds form vacancy\u2010ordered halide double perovskites (VODPs) with TMA\n +<\/jats:sup>\n cation in the A\u2010site, Sn\n 4+<\/jats:sup>\n cation in the M\u2010site and X\n \u2212<\/jats:sup>\n anion in the halide site. This study reports the synthesis and the structural phase transition of (TMA)\u2082SnCl\u2086, (TMA)\n 2<\/jats:sub>\n SnCl\n 0.7<\/jats:sub>\n Br\n 5.3<\/jats:sub>\n , (TMA)\u2082SnBr\u2086, and (TMA)\u2082SnI\u2086. All four halides crystallize in a cubic\n Fd<\/jats:italic>\n c<\/jats:italic>\n symmetry at room temperature. At elevated temperatures, (TMA)\n 2<\/jats:sub>\n SnCl\n 6<\/jats:sub>\n and (TMA)\n 2<\/jats:sub>\n SnBr\n 6<\/jats:sub>\n show phase transition to a cubic\n Fm<\/jats:italic>\n m<\/jats:italic>\n symmetry at 364\u2005K and 369\u2005K, respectively. While the phase transition of (TMA)\n 2<\/jats:sub>\n SnCl\n 6<\/jats:sub>\n was reported earlier, that of (TMA)\n 2<\/jats:sub>\n SnBr\n 6<\/jats:sub>\n is reported for the first time in this study. The synthesis and structures of (TMA)\n 2<\/jats:sub>\n SnCl\n 0.7<\/jats:sub>\n Br\n 5.3<\/jats:sub>\n and (TMA)\n 2<\/jats:sub>\n SnI\n 6<\/jats:sub>\n are reported for the first time in this study, with calorimetry data showing a reversible transition at 363\u2005K and 325\u2005K, respectively. Further, the choice of halide ligand influences the bandgap and the colour of the compounds. The absorption edge lies at 3.60\u2005eV for (TMA)\n 2<\/jats:sub>\n SnCl\n 6<\/jats:sub>\n , at 2.64\u2005eV for (TMA)\n 2<\/jats:sub>\n SnBr\n 6<\/jats:sub>\n , and at 1.12\u2005eV for (TMA)\n 2<\/jats:sub>\n SnI\n 6<\/jats:sub>\n . Such a wide tunability of bandgap across the ultraviolet to infrared regions in combination with the thermal phase change makes these perovskites interesting materials for thermal and solar energy storage applications.\n <\/jats:p>","DOI":"10.1002\/asia.202401483","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T11:23:13Z","timestamp":1741692193000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Vacancy Ordered Double Perovskites [N(CH\n 3<\/sub>\n )\n 4<\/sub>\n ]\n 2<\/sub>\n SnX\n 6<\/sub>\n (X=Cl, Br, I): Thermal Phase Transition and Wide Range Optical Absorption"],"prefix":"10.1002","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-5935-1719","authenticated-orcid":false,"given":"Nagale S.","family":"Vishwajith","sequence":"first","affiliation":[{"name":"New Chemistry Unit International Centre for Materials Science School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore 560064 India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5120-3823","authenticated-orcid":false,"given":"Ajay J.","family":"Prasad","sequence":"additional","affiliation":[{"name":"New Chemistry Unit International Centre for Materials Science School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore 560064 India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Digvijay Narayan","family":"Singh","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering Indian Institute of Science Bengaluru 560012 India"},{"name":"Department of Physics Dayananda Sagar College of Engineering K S Layout Bengaluru 560111 Karnataka India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4717-9346","authenticated-orcid":false,"given":"Pratap","family":"Vishnoi","sequence":"additional","affiliation":[{"name":"New Chemistry Unit International Centre for Materials Science School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Jakkur, Bangalore 560064 India"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,3,18]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.8b05036"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202016185"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202013383"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.4c01880"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja01432a007"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja508464w"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.7b02013"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.9b03267"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpcc.6b02175"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/adom.201900139"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.8b01549"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1107\/S0567740878005816"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.3c04288"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.8b01597"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jssc.2024.124875"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.2c02171"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemmater.7b04516"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.0c02158"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/ejic.201700764"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.3c02293"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsenergylett.0c02200"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4CC03006K"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jallcom.2018.09.158"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-023-06396-8"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1021\/ic401215x"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.5b01288"},{"key":"e_1_2_9_27_1","doi-asserted-by":"publisher","DOI":"10.1039\/a804121k"},{"key":"e_1_2_9_28_1","doi-asserted-by":"publisher","DOI":"10.1039\/B818330A"},{"key":"e_1_2_9_29_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.inorgchem.6b00735"},{"key":"e_1_2_9_30_1","doi-asserted-by":"publisher","DOI":"10.1002\/ejic.201900120"},{"key":"e_1_2_9_31_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7TA10040J"},{"key":"e_1_2_9_32_1","doi-asserted-by":"publisher","DOI":"10.1002\/ente.201900788"},{"key":"e_1_2_9_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/0040-6031(94)80042-1"},{"key":"e_1_2_9_34_1","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.6b03207"},{"key":"e_1_2_9_35_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1228604"},{"key":"e_1_2_9_36_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.joule.2020.05.001"},{"key":"e_1_2_9_37_1","doi-asserted-by":"publisher","DOI":"10.1107\/S2053273314026370"},{"key":"e_1_2_9_38_1","doi-asserted-by":"publisher","DOI":"10.1107\/S0021889808042726"},{"key":"e_1_2_9_39_1","doi-asserted-by":"publisher","DOI":"10.1107\/S0021889811038970"},{"key":"e_1_2_9_40_1","doi-asserted-by":"publisher","DOI":"10.1107\/S0021889813003531"}],"container-title":["Chemistry 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