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The octahedral coordination geometry around the Fe\n                    <jats:sup>II<\/jats:sup>\n                    centre is completed by a bidentate 5,5\u2032-dimethyl-2,2\u2032-bipyridine ligand. Two polymorphs for this compound were obtained from the crude reaction product, the first in the space group\n                    <jats:italic>P<\/jats:italic>\n                    -1 and the other in\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>c<\/jats:italic>\n                    . The molecular and crystal structures are very similar for both forms, the main difference being that the eight-membered Fe(\u03bc-1,3-N\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    Fe metallacycle formed with\n                    <jats:italic>end-to-end<\/jats:italic>\n                    azide ligands has a nearly flat conformation in the triclinic form and a chair conformation in the monoclinic form. In spite of this geometric difference, both forms have the same density, the same packing index and similar arrangements of the one-dimensional chains in the crystal. As a consequence, they also share very similar Hirshfeld surfaces and fingerprint plots. However, a density functional theory (DFT) computational study showed that the monoclinic form is more stable than the triclinic form by\n                    <jats:italic>ca<\/jats:italic>\n                    30.5\u2005kJ\u2005mol\n                    <jats:sup>\u22121<\/jats:sup>\n                    .\n                  <\/jats:p>","DOI":"10.1107\/s2053229622006908","type":"journal-article","created":{"date-parts":[[2022,7,21]],"date-time":"2022-07-21T12:07:32Z","timestamp":1658405252000},"page":"449-454","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Concomitant dimorphism in poly[di-\u03bc-azido-(5,5\u2032-dimethyl-2,2\u2032-bipyridine)iron(II)]"],"prefix":"10.1107","volume":"78","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8160-3852","authenticated-orcid":true,"given":"Zouaoui","family":"Setifi","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02571vj15","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9209-7580","authenticated-orcid":true,"given":"Sylvain","family":"Bern\u00e8s","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03p2z7827","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6168-8756","authenticated-orcid":true,"given":"David K.","family":"Geiger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatima","family":"Setifi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02rzqza52","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6739-8514","authenticated-orcid":true,"given":"Jan","family":"Reedijk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2022,7,21]]},"reference":[{"key":"dg3032_bb1","doi-asserted-by":"crossref","first-page":"7150","DOI":"10.1021\/acs.cgd.1c01009","volume":"21","author":"Andrews","year":"2021","journal-title":"Cryst. 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