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We designed a series of asymmetric photopolymerizable diacetylene bisamides bearing variable alkyl chains,\n                    <jats:bold>\n                      DA\n                      <jats:italic>\n                        <jats:sub>n<\/jats:sub>\n                      <\/jats:italic>\n                    <\/jats:bold>\n                    (\n                    <jats:italic>n<\/jats:italic>\n                    = 2, 5, 10), to connect the DA with a chiral azobenzene motif. Topochemical polymerization in thin films of DA forms orange colored PDAs to furnish long\u2010ranged fibrillar nanostructures with increasing alkyl chain lengths. The polymer nanostructures exhibit axial or lateral growth after thermal annealing due to improved ordering in the polymeric domains. The PDA self\u2010assembly exhibits crystalline or soft\u2010crystalline packing based on alkyl chain stacking, aromatic interactions, and hydrogen bonding. Differential molecular packing in the PDAs dictates the\n                    <jats:italic>E<\/jats:italic>\n                    to\n                    <jats:italic>Z<\/jats:italic>\n                    photoisomerization percentages, eventually resulting in diminishing chiroptical signatures and anisotropic textures. Photoisomerization\u2010mediated dynamic disassembly in 1D nanofibers are observed in the PDAs bearing decyl chain spacers, which show prominent room temperature soft\u2010crystalline switching behavior. Reverse photoisomerization of\n                    <jats:italic>Z<\/jats:italic>\n                    to\n                    <jats:italic>E<\/jats:italic>\n                    mediated structural reordering result recovery of the chiral packing, morphology, and birefringent patterns. Such tunable soft\u2010crystalline PDAs provide a convenient access to soft adaptable chiroptical materials toward solid\u2010state actuation applications.\n                  <\/jats:p>","DOI":"10.1002\/asia.202500926","type":"journal-article","created":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T04:06:05Z","timestamp":1765253165000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Azobenzene Photoswitch in Asymmetric Polydiacetylenes Dictates Molecular Ordering and Soft\u2010Crystalline Transitions"],"prefix":"10.1002","volume":"21","author":[{"given":"Antarlina","family":"Maulik","sequence":"first","affiliation":[{"name":"Chemical Biology Unit Institute of Nano Science and Technology (INST)  Mohali Punjab India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ritobrata","family":"De","sequence":"additional","affiliation":[{"name":"Department of Chemical Sciences IISER Mohali  Mohali Punjab 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