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Here, an order transition in an IL@MOF composite is discovered using CuBTC (copper benzene\u20101,3,5\u2010tricarboxylate) and [EMIM][TFSI] (1\u2010ethyl\u20103\u2010methylimidazolium bis(trifluoromethanesulfonyl)imide). This transition \u2013 absent for the bare MOF or IL \u2013 provides an extended super\u2010cooling range and latent heat at a capacity similar to that of soft paraffins, in the temperature range of \u2248220\u00a0\u00b0C. Structural analysis and in situ monitoring indicate an electrostatic interaction between the IL molecules and the Cu paddle\u2010wheels, leading to a decrease in pore symmetry at low temperature. These interactions are reversibly released above the transition temperature, which reflects in a volume expansion of the MOF\u2010IL composite.<\/jats:p>","DOI":"10.1002\/smll.202303315","type":"journal-article","created":{"date-parts":[[2024,7,26]],"date-time":"2024-07-26T09:08:35Z","timestamp":1721984915000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Observation of a Reversible Order\u2010Order Transition in a Metal\u2010Organic Framework \u2013 Ionic Liquid Nanocomposite Phase\u2010Change Material"],"prefix":"10.1002","volume":"20","author":[{"given":"Vahid","family":"Nozari","sequence":"first","affiliation":[{"name":"Otto Schott Institute of Materials Research University of Jena  07743 Jena Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ayda Nemati Vesali","family":"Azar","sequence":"additional","affiliation":[{"name":"Otto Schott Institute of Materials Research University of Jena  07743 Jena Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roman","family":"Sajzew","sequence":"additional","affiliation":[{"name":"Otto Schott Institute of Materials Research University of Jena  07743 Jena Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Celia","family":"Castillo\u2010Blas","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  27 Charles Babbage Road Cambridge CB30FS UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ayano","family":"Kono","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  27 Charles Babbage Road Cambridge CB30FS UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Oschatz","sequence":"additional","affiliation":[{"name":"Center of Energy and Environmental Chemistry University of Jena  07743 Jena Germany"},{"name":"Institute of Technical Chemistry and Environmental Chemistry University of Jena  07743 Jena Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David A.","family":"Keen","sequence":"additional","affiliation":[{"name":"ISIS Facility, Rutherford Appleton Laboratory Harwell Campus  Didcot Oxfordshire OX11 0QX UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip A.","family":"Chater","sequence":"additional","affiliation":[{"name":"Diamond Light Source Ltd., Diamond House Harwell Campus  Didcot Oxfordshire OX11 0QX UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Georgina P.","family":"Robertson","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  27 Charles Babbage Road Cambridge CB30FS UK"},{"name":"Diamond Light Source Ltd., Diamond House Harwell Campus  Didcot Oxfordshire OX11 0QX UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James M. 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