{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T16:54:18Z","timestamp":1785430458808,"version":"3.56.0"},"reference-count":0,"publisher":"International Union of Crystallography (IUCr)","issue":"3","license":[{"start":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T00:00:00Z","timestamp":1779148800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},{"start":{"date-parts":[[2026,5,19]],"date-time":"2026-05-19T00:00:00Z","timestamp":1779148800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"}],"funder":[{"DOI":"10.13039\/501100000266","name":"EPSRC","doi-asserted-by":"crossref","award":["EP\/F03637X\/1"],"award-info":[{"award-number":["EP\/F03637X\/1"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iucr.org","wiley.com","iucrj.org"],"crossmark-restriction":true},"short-container-title":["Acta Crystallogr B Struct Sci Cryst Eng Mater","Acta Crystallogr B","Acta Crystallogr B Struct Sci","Acta Cryst B","Acta Cryst B Struct Sci Cryst Eng Mater","Acta Cryst Sect B","Acta Cryst Sect B Struct Sci Cryst Eng Mater","Acta Crystallogr Sect B","Acta Crystallogr Sect B Struct Sci Cryst Eng Mater","Acta Crystallogr Sect B Struct Sci"],"accepted":{"date-parts":[[2026,4,28]]},"published-print":{"date-parts":[[2026,6,1]]},"abstract":"<jats:p>\n                    Crystal structures with asymmetric units comprising large numbers of molecules (\n                    <jats:italic>Z<\/jats:italic>\n                    \u2032 &gt; 4) remain rare. Their study provides a unique opportunity to further the understanding of the physical basis for crystal formation, supporting the advancement of crystal structure prediction, crystal engineering and the study of polymorphism. Here the crystal structures of a series of three related 2,3,9,9\n                    <jats:italic>a<\/jats:italic>\n                    -tetrahydro-1\n                    <jats:italic>H<\/jats:italic>\n                    -carbazoles are discussed, one of which exhibits an asymmetric unit comprising six crystallographically independent molecules (\n                    <jats:italic>Z<\/jats:italic>\n                    \u2032 = 6). Careful analysis of this structure reveals approximate\n                    <jats:italic>Fdd<\/jats:italic>\n                    2 symmetry and strong evidence for this being linked to a symmetry-reducing, low-temperature phase transition. Comparison of the structures reveals that the variation in\n                    <jats:italic>Z<\/jats:italic>\n                    \u2032 values is linked to conformational changes related to the lack of classical hydrogen bonding in the high-\n                    <jats:italic>Z<\/jats:italic>\n                    \u2032 structure.\n                  <\/jats:p>","DOI":"10.1107\/s2052520626004506","type":"journal-article","created":{"date-parts":[[2026,5,26]],"date-time":"2026-05-26T10:27:22Z","timestamp":1779791242000},"page":"339-343","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Structural modification of functionalized carbazoles: from\n                    <i>Z\u2032<\/i>\n                    = 1 to\n                    <i>Z\u2032<\/i>\n                    = 6"],"prefix":"10.1107","volume":"82","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3576-7562","authenticated-orcid":true,"given":"Matokah","family":"Abualnaja","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kj2bm70","id-type":"ROR","asserted-by":"publisher"}],"department":["Chemistry, School of Natural and Environmental Sciences"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2412-7917","authenticated-orcid":true,"given":"Michael Richard","family":"Probert","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kj2bm70","id-type":"ROR","asserted-by":"publisher"}],"department":["Chemistry, School of Natural and Environmental Sciences"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6475-9161","authenticated-orcid":true,"given":"Michael John","family":"Hall","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kj2bm70","id-type":"ROR","asserted-by":"publisher"}],"department":["Chemistry, School of Natural and Environmental Sciences"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolyn P.","family":"Brock","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02k3smh20","id-type":"ROR","asserted-by":"publisher"}],"department":["Department of Chemistry"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7851-7347","authenticated-orcid":true,"given":"Paul Gordon","family":"Waddell","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kj2bm70","id-type":"ROR","asserted-by":"publisher"}],"department":["Chemistry, School of Natural and Environmental Sciences"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2026,5,19]]},"container-title":["Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials"],"original-title":[],"link":[{"URL":"https:\/\/journals.iucr.org\/b\/issues\/2026\/03\/00\/dk5149\/dk5149.pdf","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.iucr.org\/b\/issues\/2026\/03\/00\/dk5149\/dk5149.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T11:21:35Z","timestamp":1780572095000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.iucr.org\/paper?S2052520626004506"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,5,19]]},"references-count":0,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2026,6]]}},"alternative-id":["S2052520626004506"],"URL":"https:\/\/doi.org\/10.1107\/s2052520626004506","relation":{"is-supplemented-by":[{"id-type":"doi","id":"10.1107\/S2052520626004506\/dk5149sup1.cif","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S2052520626004506\/dk51492bsup2.hkl","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S2052520626004506\/dk51492csup3.hkl","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S2052520626004506\/dk5149fdd2sup4.hkl","asserted-by":"subject"},{"id-type":"doi","id":"10.1107\/S2052520626004506\/dk5149sup5.pdf","asserted-by":"subject"}]},"ISSN":["2052-5206"],"issn-type":[{"value":"2052-5206","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,5,19]]},"assertion":[{"value":"Acta 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(CC-BY)","order":1,"name":"license","label":"Licence","explanation":{"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/legalcode"},"group":{"name":"copyright_and_licencing","label":"Copyright and licencing"}}]}}