{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T03:05:23Z","timestamp":1788145523995,"version":"build-2803163510"},"reference-count":57,"publisher":"Wiley","issue":"15","license":[{"start":{"date-parts":[[2025,2,11]],"date-time":"2025-02-11T00:00:00Z","timestamp":1739232000000},"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":["SERB\/JCB\/2023\/00039"],"award-info":[{"award-number":["SERB\/JCB\/2023\/00039"]}],"id":[{"id":"10.13039\/501100001843","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001843","name":"Science and Engineering Research Board","doi-asserted-by":"publisher","award":["SERB\/CRG\/2022\/568"],"award-info":[{"award-number":["SERB\/CRG\/2022\/568"]}],"id":[{"id":"10.13039\/501100001843","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2025,4,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    A squaramide\u2010based monomer, designed for topochemical azide\u2010alkyne cycloaddition (TAAC) polymerization, crystallizes as two polymorphs,\n                    <jats:bold>M1<\/jats:bold>\n                    and\n                    <jats:bold>M2<\/jats:bold>\n                    , both having crystal packing suitable for topochemical polymerization. The hydrogen\u2010bonding between squaramide units bias the molecular organization in both the polymorphs. 3D packing of H\u2010bonded stacks of monomer lead to juxtaposition of azide and alkyne units of adjacent molecules in a transition\u2010state\u2010like arrangement for their regiospecific cycloaddition reaction. The monomers are arranged as supramolecular sheets and supramolecular helices in polymorph\n                    <jats:bold>M1<\/jats:bold>\n                    and\n                    <jats:bold>M2<\/jats:bold>\n                    respectively. Both the polymorphs undergo slow and spontaneous regiospecific TAAC polymerization at room temperature, but react quickly at higher temperatures, resulting in 1,4\u2010traizolyl\u2010linked polymer, with distinct mechanical responses. Upon heating, single crystals of polymorph\n                    <jats:bold>M1<\/jats:bold>\n                    show expansion followed by contraction without any permanent dimensional change, whereas crystals of polymorph\n                    <jats:bold>M2<\/jats:bold>\n                    undergo splitting. At moderate temperatures, both the polymorphs undergo single\u2010crystal\u2010to\u2010single\u2010crystal (SCSC) polymerization, resulting in two polymer\u2010polymorphs with distinct topologies that can be studied at atomic resolution by single\u2010crystal X\u2010ray crystallography. The polymorph\n                    <jats:bold>M1<\/jats:bold>\n                    reacts to polymer\n                    <jats:bold>P1<\/jats:bold>\n                    with \u03b2\u2010sheet\u2010like topology, and polymorph\n                    <jats:bold>M2<\/jats:bold>\n                    reacts to polymer\n                    <jats:bold>P2<\/jats:bold>\n                    having polymer chains of helical conformation. Nanoindentation experiments with crystals of these polymers revealed their distinct mechanical properties.\n                  <\/jats:p>","DOI":"10.1002\/anie.202500646","type":"journal-article","created":{"date-parts":[[2025,1,28]],"date-time":"2025-01-28T03:41:43Z","timestamp":1738035703000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Single\u2010Crystal\u2010to\u2010Single\u2010Crystal Synthesis of a Polymer in Two Distinct Topologies"],"prefix":"10.1002","volume":"64","author":[{"given":"Javed R.","family":"Pathan","sequence":"first","affiliation":[{"name":"School of Chemistry Indian Institute of Science Education and Research  Thiruvananthapuram Kerala 695551 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haripriya","family":"Balan","sequence":"additional","affiliation":[{"name":"School of Chemistry Indian Institute of Science Education and Research  Thiruvananthapuram Kerala 695551 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaustav","family":"Das","sequence":"additional","affiliation":[{"name":"Department of Chemical Sciences Indian Institute of Science Education and Research  Kolkata West Bengal 741246 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. 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