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Although the coexistence of various EMF species in soot is common for rare\u2010earth metals, we herein report that europium tends to prefer the formation of mono\u2010EMFs. Mass spectroscopy reveals that mono\u2010EMFs (Eu@C<jats:sub>2<jats:italic>n<\/jats:italic><\/jats:sub>) prevail in the Eu\u2010containing soot. Theoretical calculations demonstrate that the encapsulation energy of the endohedral metal accounts for the selective formation of mono\u2010EMFs and rationalize similar observations for EMFs containing other metals like Ca, Sr, Ba, or Yb. Consistently, all isolated Eu\u2010EMFs are mono\u2010EMFs, including Eu@<jats:italic>D<\/jats:italic><jats:sub>3<jats:italic>h<\/jats:italic><\/jats:sub>(1)\u2010C<jats:sub>74<\/jats:sub>, Eu@<jats:italic>C<\/jats:italic><jats:sub>2<jats:italic>v<\/jats:italic><\/jats:sub>(19138)\u2010C<jats:sub>76<\/jats:sub>, Eu@<jats:italic>C<\/jats:italic><jats:sub>2<jats:italic>v<\/jats:italic><\/jats:sub>(3)\u2010C<jats:sub>78<\/jats:sub>, Eu@<jats:italic>C<\/jats:italic><jats:sub>2<jats:italic>v<\/jats:italic><\/jats:sub>(3)\u2010C<jats:sub>80<\/jats:sub>, and Eu@<jats:italic>D<\/jats:italic><jats:sub>3<jats:italic>d<\/jats:italic><\/jats:sub>(19)\u2010C<jats:sub>84<\/jats:sub>, which are identified by crystallography. Remarkably, Eu@<jats:italic>C<\/jats:italic><jats:sub>2<jats:italic>v<\/jats:italic><\/jats:sub>(19138)\u2010C<jats:sub>76<\/jats:sub> represents the first Eu\u2010containing EMF with a cage that violates the isolated\u2010pentagon\u2010rule, and Eu@<jats:italic>C<\/jats:italic><jats:sub>2<jats:italic>v<\/jats:italic><\/jats:sub>(3)\u2010C<jats:sub>78<\/jats:sub> is the first C<jats:sub>78<\/jats:sub>\u2010based EMF stabilized by merely one metal atom.<\/jats:p>","DOI":"10.1002\/anie.201910743","type":"journal-article","created":{"date-parts":[[2019,12,2]],"date-time":"2019-12-02T19:15:23Z","timestamp":1575314123000},"page":"5259-5262","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Preferential Formation of Mono\u2010Metallofullerenes Governed by the Encapsulation Energy of the Metal Elements: A Case Study on Eu@C<sub>2<i>n<\/i><\/sub> (2<i>n<\/i>=74\u201384) Revealing a General Rule"],"prefix":"10.1002","volume":"59","author":[{"given":"Lipiao","family":"Bao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Materials Processing and Die &amp; Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology  1037 Luoyu Road Wuhan 430074 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Li","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Hebei University of Technology  Tianjin 300130 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pengyuan","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Processing and Die &amp; Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology  1037 Luoyu Road Wuhan 430074 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wangqiang","family":"Shen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Processing and Die &amp; Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology  1037 Luoyu Road Wuhan 430074 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peng","family":"Jin","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering Hebei University of Technology  Tianjin 300130 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2741-8733","authenticated-orcid":false,"given":"Xing","family":"Lu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Materials Processing and Die &amp; Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology  1037 Luoyu Road Wuhan 430074 China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,12,20]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/318162a0"},{"key":"e_1_2_2_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/c2cs35214a"},{"key":"e_1_2_2_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr300297r"},{"key":"e_1_2_2_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-36199-9_362-1"},{"key":"e_1_2_2_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6CS00498A"},{"key":"e_1_2_2_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/347354a0"},{"key":"e_1_2_2_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2013.05.020"},{"key":"e_1_2_2_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.accounts.8b00014"},{"key":"e_1_2_2_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja306890x"},{"key":"e_1_2_2_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja5035649"},{"key":"e_1_2_2_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200503705"},{"key":"e_1_2_2_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200503705"},{"key":"e_1_2_2_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/c0cc00835d"},{"key":"e_1_2_2_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja200289w"},{"key":"e_1_2_2_14_1","doi-asserted-by":"publisher","DOI":"10.1038\/35044199"},{"key":"e_1_2_2_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200600261"},{"key":"e_1_2_2_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200390237"},{"key":"e_1_2_2_16_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200390206"},{"key":"e_1_2_2_17_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja101131e"},{"key":"e_1_2_2_18_1","volume-title":"An Atlas of Fullerenes 2007 Edn","author":"Fowler P. 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