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Matter"],"published-print":{"date-parts":[[2020,5,13]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Luminescent oligo(p-phenylene ethynylene) (OPE) and spin-crossover (SCO) active Fe(II)-2,6-di(pyrazol-1-yl) pyridine (BPP) systems are prominent examples proposed to develop functional materials such as molecular wires\/memories. A marriage between OPE and Fe(II)-BPP systems is a strategy to obtain supramolecular luminescent ligands capable of metal coordination useful to produce novel spin-switchable hybrids with synergistic coupling between spin-state of Fe(II) and a physical property associated with the OPE skeleton, for example, electronic conductivity or luminescence. To begin in this direction, two novel ditopic ligands, namely L\n                    <jats:sup>1<\/jats:sup>\n                    and L\n                    <jats:sup>2<\/jats:sup>\n                    , featuring OPE-type backbone end-capped with metal coordinating BPP were designed and synthetized. The ligand L\n                    <jats:sup>2<\/jats:sup>\n                    tailored with 2-ethylhexyloxy chains at the 2 and 5 positions of the OPE skeleton shows modulated optical properties and improved solubility in common organic solvents relative to the parent ligand L\n                    <jats:sup>1<\/jats:sup>\n                    . Solution phase complexation of L\n                    <jats:sup>1<\/jats:sup>\n                    and L\n                    <jats:sup>2<\/jats:sup>\n                    with Fe(BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>2<\/jats:sub>\n                    \u00b76H\n                    <jats:sub>2<\/jats:sub>\n                    O resulted in the formation of insoluble materials of the composition [Fe(L\n                    <jats:sup>1<\/jats:sup>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    (BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>\n                      2\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    and [Fe(L\n                    <jats:sup>2<\/jats:sup>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    (BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>\n                      2\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    as inferred from elemental analyses. Complex [Fe(L\n                    <jats:sup>1<\/jats:sup>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    (BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>\n                      2\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    underwent thermal SCO centred at\n                    <jats:italic>T<\/jats:italic>\n                    <jats:sub>1\/2<\/jats:sub>\n                    \u2009\u2009=\u2009\u2009275\u2009K as well as photoinduced low-spin to high-spin transition with the existence of the metastable high-spin state up to 52\u2009K. On the other hand, complex [Fe(L\n                    <jats:sup>2<\/jats:sup>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    (BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>\n                      2\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    , tethered with 2-ethylhexyloxy groups, showed gradual and half-complete SCO with 50% of the Fe(II)-centres permanently blocked in the high-spin state due to intermolecular steric interactions. The small angle x-ray scattering (SAXS) pattern of the as-prepared solid complex [Fe(L\n                    <jats:sup>1<\/jats:sup>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    (BF\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>\n                      2\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    revealed the presence of nm-sized crystallites implying a possible methodology towards the template-free synthesis of functional-SCO nanostructures.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/ab6cc2","type":"journal-article","created":{"date-parts":[[2020,1,16]],"date-time":"2020-01-16T17:46:10Z","timestamp":1579196770000},"page":"204002","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Spin-crossover in iron(II)-phenylene ethynylene-2,6-di(pyrazol-1-yl) pyridine hybrids: toward switchable molecular wire-like architectures"],"prefix":"10.1088","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1501-7759","authenticated-orcid":false,"given":"Kuppusamy","family":"Senthil Kumar","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ivan","family":"\u0160alitro\u0161","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6795-2733","authenticated-orcid":false,"given":"Beno\u00eet","family":"Heinrich","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simona","family":"Moldovan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matteo","family":"Mauro","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7718-7016","authenticated-orcid":false,"given":"Mario","family":"Ruben","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2020,2,18]]},"reference":[{"year":"2009","author":"Fourmigu\u00e9","key":"cmab6cc2bib001","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-00408-7","type":"book"},{"key":"cmab6cc2bib002","doi-asserted-by":"publisher","first-page":"447","DOI":"10.1038\/35044035","type":"journal-article","article-title":"Coexistence of ferromagnetism and metallic conductivity in a molecule-based layered compound","volume":"408","author":"Coronado","year":"2000","journal-title":"Nature"},{"year":"1991","author":"Gatteschi","key":"cmab6cc2bib003","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-011-3254-1","type":"book"},{"key":"cmab6cc2bib004","doi-asserted-by":"publisher","first-page":"1073","DOI":"10.1002\/adma.201502589","type":"journal-article","article-title":"Mechanoresponsive luminescent molecular assemblies: an emerging class of materials","volume":"28","author":"Sagara","year":"2016","journal-title":"Adv. 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