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However, as miniaturisation approaches its theoretical limit, new memory materials are being sought. Herein, we report a unique material exhibiting single\u2010molecule electric polarisation switching that can operate above room temperature. The phenomenon occurs in a Preyssler\u2010type polyoxometalate (POM) cluster we call a single\u2010molecule electret (SME). It exhibits all the characteristics of ferroelectricity but without long\u2010range dipole ordering. The SME affords bi\u2010stability as a result of the two potential positions of localisation of a Tb<jats:sup>3+<\/jats:sup> ion trapped in the POM, resulting in extremely slow relaxation of the polarisation and electric hysteresis with high spontaneous polarisation and coercive electric fields. Our findings suggest that SMEs can potentially be applied to ultrahigh\u2010density memory<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#ange201806803-bib-0001\"\/> and other molecular\u2010level electronic devices operating above room temperature.<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"#ange201806803-bib-0002\"\/><\/jats:p>","DOI":"10.1002\/ange.201806803","type":"journal-article","created":{"date-parts":[[2018,8,8]],"date-time":"2018-08-08T06:08:27Z","timestamp":1533708507000},"page":"13617-13620","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Giant Hysteretic Single\u2010Molecule Electric Polarisation Switching above Room Temperature"],"prefix":"10.1002","volume":"130","author":[{"given":"Chisato","family":"Kato","sequence":"first","affiliation":[{"name":"Department of Chemistry Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]},{"given":"Ryo","family":"Machida","sequence":"additional","affiliation":[{"name":"Department of Chemistry Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]},{"given":"Rio","family":"Maruyama","sequence":"additional","affiliation":[{"name":"Department of Chemistry Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]},{"given":"Ryo","family":"Tsunashima","sequence":"additional","affiliation":[{"name":"Graduate School of Science and Engineering Yamaguchi University  1377-1, Yoshida Yamaguchi 753-8512 Japan"}]},{"given":"Xiao\u2010Ming","family":"Ren","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Molecular Engineering College of Materials Science &amp; Engineering Nanjing Teck University  Nanjing 210009 P. R. China"},{"name":"State Key Laboratory of Coordination Chemistry Nanjing University  Nanjing 210023 P. R. China"}]},{"given":"Mohamedally","family":"Kurmoo","sequence":"additional","affiliation":[{"name":"Institut de Chimie de Strasbourg CNRS-UMR7177 Universit\u00e9 de Strasbourg  4 rue Blaise Pascal 67070 Strasbourg France"},{"name":"Chirality Research Center Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]},{"given":"Katsuya","family":"Inoue","sequence":"additional","affiliation":[{"name":"Department of Chemistry Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"},{"name":"Chirality Research Center Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"},{"name":"Institute for Advanced Materials Research Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4030-786X","authenticated-orcid":false,"given":"Sadafumi","family":"Nishihara","sequence":"additional","affiliation":[{"name":"Department of Chemistry Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"},{"name":"Chirality Research Center Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"},{"name":"Institute for Advanced Materials Research Hiroshima University  1-3-1, Kagamiyama Higashi-hiroshima 739-8526 Japan"}]}],"member":"311","published-online":{"date-parts":[[2018,8,17]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature13951"},{"key":"e_1_2_2_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2374"},{"key":"e_1_2_2_4_1","unstructured":"\u00a0"},{"key":"e_1_2_2_5_2","doi-asserted-by":"publisher","DOI":"10.1533\/9781845694005"},{"key":"e_1_2_2_6_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1129564"},{"key":"e_1_2_2_7_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2377"},{"key":"e_1_2_2_8_2","doi-asserted-by":"publisher","DOI":"10.1039\/C4EE03749A"},{"key":"e_1_2_2_9_2","doi-asserted-by":"publisher","DOI":"10.1039\/C4DT03763D"},{"key":"e_1_2_2_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature16984"},{"key":"e_1_2_2_11_1","first-page":"30","volume":"1","author":"Preyssler C.","year":"1970","journal-title":"Bull. 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