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However, so far, post\u2010synthetic modification of MOFs linkers has not been explored as a route to produce such thermometers, despite its potential to design the lanthanide coordination sphere and, thus, tune the emission properties of the material. Here, nanocrystals of MIL\u201068\u2010NH<jats:sub>2<\/jats:sub> were post\u2010synthetically modified via a cross\u2010linking reaction with 1,4\u2010Bis{4\u2010[(<jats:italic>E<\/jats:italic>)\u20103\u2010(<jats:italic>N<\/jats:italic>,<jats:italic>N<\/jats:italic>\u2010dimethylamino)prop\u20102\u2010enoyl]phenoxy}butane (HL), followed by coordination to Eu<jats:sup>3+<\/jats:sup> and Tb<jats:sup>3+<\/jats:sup> ions. The luminescence properties of the material were assessed. Tb<jats:sub>90<\/jats:sub>Eu<jats:sub>10<\/jats:sub>\u2010MIL\u201068\u2010HL was found to be an excellent cryogenic (&lt; 100 K) ratiometric luminescent nanothermometer exhibiting a maximum relative sensitivity of 9.4\u2009% K<jats:sup>\u20131<\/jats:sup> at 12 K.<\/jats:p>","DOI":"10.1002\/ejic.201900110","type":"journal-article","created":{"date-parts":[[2019,2,21]],"date-time":"2019-02-21T13:25:49Z","timestamp":1550755549000},"page":"1354-1359","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Luminescent Nanothermometers Obtained by Post\u2010Synthetic Modification of Metal\u2010Organic Framework MIL\u201068"],"prefix":"10.1002","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1700-5361","authenticated-orcid":false,"given":"Reda M.","family":"Abdelhameed","sequence":"first","affiliation":[{"name":"Department of Chemistry CICECO\u2010Aveiro Institute of Materials University of Aveiro  3810\u2010193 Aveiro Portugal"},{"name":"Department of Chemistry QOPNA University of Aveiro  3810\u2010193 Aveiro Portugal"},{"name":"Applied Organic Chemistry Department QOPNA National Research Centre  33 EL Bohouth st. 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