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(\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>cis<\/jats:italic>\n                    ), (\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    ) and (\n                    <jats:italic>trans<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    ), of a \u2018nano\u2010sized\u2019 highly\u2010flexible urea\u2010bridged Zn(II)porphyrin dimer have been achieved\n                    <jats:italic>via<\/jats:italic>\n                    careful manipulations of external stimuli such as solvent dielectrics, temperature, anionic interactions, axial ligation and surface\u2010induced stabilization. The conformers differ widely in their structures, chemical and photophysical properties and thus have vast potential applicability. X\u2010ray structural characterizations have been reported for the (\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>cis<\/jats:italic>\n                    ) and (\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    )\u2010conformers. While (\n                    <jats:italic>cis,cis<\/jats:italic>\n                    ) conformer stabilized exclusively in dichloromethane, more polar solvents resulted in the stabilization of (\n                    <jats:italic>cis,trans<\/jats:italic>\n                    ) and (\n                    <jats:italic>trans,trans<\/jats:italic>\n                    )\u2010conformers. Low temperature promotes the stabilization of (\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    )\u2010conformer while rise in temperature facilitates flipping to the (\n                    <jats:italic>cis<\/jats:italic>\n                    ,\n                    <jats:italic>cis<\/jats:italic>\n                    ) one. Significantly, exclusive stabilization of the (\n                    <jats:italic>trans<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    )\u2010isomer has been illustrated using acetate anion which facilitates H\u2010bonding with the two amide linkages of the urea spacer. Remarkably, HOPG surface facilitates stabilization of the energetically challenging (\n                    <jats:italic>trans<\/jats:italic>\n                    ,\n                    <jats:italic>trans<\/jats:italic>\n                    )\u2010conformer\n                    <jats:italic>via<\/jats:italic>\n                    CH\u22c5\u22c5\u22c5\u03c0 and \u03c0\u22c5\u22c5\u22c5\u03c0 interactions with the solid surface to the porphyrinic cores. DFT calculations demonstrate that the relative stability of the conformers can be modulated upon slight external perturbations as also observed in the experiment. Several factors contributing towards the conformational landscape for the highly flexible urea\u2010bridged porphyrin dimers have been mapped.\n                  <\/jats:p>","DOI":"10.1002\/chem.202402536","type":"journal-article","created":{"date-parts":[[2024,9,9]],"date-time":"2024-09-09T11:35:28Z","timestamp":1725881728000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Conformational Switching of a Nano\u2010Size Urea\u2010Bridged Zn(II)Porphyrin Dimer by External Stimuli"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8138-3618","authenticated-orcid":false,"given":"Bapan","family":"Saha","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-4208-7966","authenticated-orcid":false,"given":"Chandrani","family":"Pal","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4866-9574","authenticated-orcid":false,"given":"Himani","family":"Malik","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3219-7907","authenticated-orcid":false,"given":"Thiruvancheril G.","family":"Gopakumar","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4129-5074","authenticated-orcid":false,"given":"Sankar Prasad","family":"Rath","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology Kanpur  Kanpur 208016 India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,11,7]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"\u00a0"},{"key":"e_1_2_8_2_2","unstructured":"M. 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