{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T12:12:52Z","timestamp":1785413572456,"version":"3.56.0"},"reference-count":28,"publisher":"International Union of Crystallography (IUCr)","issue":"1","license":[{"start":{"date-parts":[[2025,1,1]],"date-time":"2025-01-01T00:00:00Z","timestamp":1735689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/journals.iucr.org\/services\/copyrightpolicy.html"},{"start":{"date-parts":[[2025,1,1]],"date-time":"2025-01-01T00:00:00Z","timestamp":1735689600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.iucr.org\/services\/copyrightpolicy.html#TDM"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22201120"],"award-info":[{"award-number":["22201120"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr C Struct Chem","Acta Crystallogr C","Acta Crystallogr C Cryst Struct Commun","Acta Cryst C","Acta Cryst C Struct Chem","Acta Cryst Sect C","Acta Cryst Sect C Struct Chem","Acta Crystallogr Sect C","Acta Crystallogr Sect C Struct Chem","Acta Crystallogr Sect C Cryst Struct Commun"],"accepted":{"date-parts":[[2024,12,6]]},"published-print":{"date-parts":[[2025,1,1]]},"abstract":"<jats:p>\n                    In recent years, molecular-based ferroelectric materials have attracted widespread research interest due to their excellent performance. Among them, host\u2013guest-type crown ether inclusion compounds composed of organic ammonium cations, crown ether molecules and corresponding anions have become a star component in the design of molecular-based ferroelectric materials because they are prone to order\u2013disorder phase transitions. Many anions have been studied extensively as counter-ions, such as bis(trifluoromethanesulfonyl)amidate (TFSA\n                    <jats:sup>\u2212<\/jats:sup>\n                    ), PF\n                    <jats:sub>6<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    and [FeCl\n                    <jats:sub>4<\/jats:sub>\n                    ]\n                    <jats:sup>\u2212<\/jats:sup>\n                    . However, crown ether inclusion compounds with di(methanesulfonyl)amidate (DMSA) as the anion have been rarely investigated. Here, we converted TFSA to DMSA to obtain 3,4-difluoroanilinium di(methanesulfonyl)amidate\u201318-crown-6 (1\/1), C\n                    <jats:sub>6<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>2<\/jats:sub>\n                    N\n                    <jats:sup>+<\/jats:sup>\n                    \u00b7C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>6<\/jats:sub>\n                    NO\n                    <jats:sub>4<\/jats:sub>\n                    S\n                    <jats:sub>2<\/jats:sub>\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u00b7C\n                    <jats:sub>12<\/jats:sub>\n                    H\n                    <jats:sub>24<\/jats:sub>\n                    O\n                    <jats:sub>6<\/jats:sub>\n                    or [(3,4-DFA)(18-crown-6)][DMSA]. At both 100 and 300\u2005K, the crystal falls into the space group\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>c<\/jats:italic>\n                    . The 3,4-DFA cation forms three well-defined N\u2014H...O hydrogen bonds, positioned at the perching position of the crown ether ring. In contrast to the distinct packing configuration observed in the [(3,4-DFA)(18-crown-6)][TFSA] crystals, where TFSA exhibits a disordered structure, the [(3,4-DFA)(18-crown-6)][DMSA] complex features a staggered arrangement, with DMSA existing in an ordered fashion.\n                  <\/jats:p>","DOI":"10.1107\/s2053229624011872","type":"journal-article","created":{"date-parts":[[2024,12,12]],"date-time":"2024-12-12T03:21:24Z","timestamp":1733973684000},"page":"38-42","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":1,"title":["Crown ether inclusion compound 3,4-difluoroanilinium di(methanesulfonyl)amidate\u201318-crown-6 (1\/1) clathrate"],"prefix":"10.1107","volume":"81","author":[{"given":"Yao","family":"Zhang","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04ct4d772","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan-Juan","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042v6xz23","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan-Yuan","family":"Tang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042v6xz23","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8547-0885","authenticated-orcid":true,"given":"Xiao-Gang","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042v6xz23","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2025,1,1]]},"reference":[{"key":"dg3066_bb1","doi-asserted-by":"crossref","first-page":"342","DOI":"10.1038\/nmat2377","volume":"8","author":"Akutagawa","year":"2009","journal-title":"Nat. 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