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This transition\u2010metal\u2010substituted polyoxometalate readily assembles from its components in a one\u2010pot reaction and crystallizes in the monoclinic space group\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    \/\n                    <jats:italic>c<\/jats:italic>\n                    . The structure of\n                    <jats:bold>\n                      Co\n                      <jats:sub>5<\/jats:sub>\n                      Fe\n                    <\/jats:bold>\n                    can be considered a double sandwich composed by two B\u2010\u03b1\u2010{Co\n                    <jats:sub>2.5<\/jats:sub>\n                    Fe\n                    <jats:sub>0.5<\/jats:sub>\n                    PW\n                    <jats:sub>9<\/jats:sub>\n                    O\n                    <jats:sub>40<\/jats:sub>\n                    } Keggin units, in which one coordinatively saturated octahedral metal position is equally occupied by Co(II) and Fe(III) ions with a 50\u2009% of site occupancy. These Keggin units are linked via a hexalacunary Keggin unit {PW\n                    <jats:sub>6<\/jats:sub>\n                    O\n                    <jats:sub>26<\/jats:sub>\n                    }. Single crystal X\u2010ray diffraction and magnetic measurements support the proposed atom arrangement within the crystal structure. Magnetic measurements of these double trimeric unit {Co\n                    <jats:sub>2.5<\/jats:sub>\n                    Fe\n                    <jats:sub>0.5<\/jats:sub>\n                    O\n                    <jats:sub>13<\/jats:sub>\n                    }\n                    <jats:sub>2<\/jats:sub>\n                    show a combination of antiferromagnetic interactions, the presence of spin frustration, and the first\u2010order spin\u2010orbit coupling of Co(II) ions. Electrocatalytic water oxidation measurements show that\n                    <jats:bold>\n                      Co\n                      <jats:sub>5<\/jats:sub>\n                      Fe\n                    <\/jats:bold>\n                    displays low stability in both homogeneous and heterogeneous conditions. This is evidenced by the constant increase on the catalytic currents over time together with the appearance of polyoxometalate\u2010derived electrode\u2010bound species that can be responsible for the observed catalytic activity.\n                  <\/jats:p>","DOI":"10.1002\/cplu.202400473","type":"journal-article","created":{"date-parts":[[2024,9,24]],"date-time":"2024-09-24T09:02:12Z","timestamp":1727168532000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Novel Banana\u2010Shaped Mixed\u2010Metal Co\/Fe Polyoxometalate Cluster"],"prefix":"10.1002","volume":"90","author":[{"given":"Javier","family":"Quir\u00f3s\u2010Huerta","sequence":"first","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6967-288X","authenticated-orcid":false,"given":"Jos\u00e9","family":"Troya","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3868-1078","authenticated-orcid":false,"given":"Miguel","family":"Clemente\u2010Le\u00f3n","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3198-073X","authenticated-orcid":false,"given":"Juan Modesto","family":"Clemente\u2010Juan","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1848-8791","authenticated-orcid":false,"given":"Eugenio","family":"Coronado","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9203-3752","authenticated-orcid":false,"given":"Joaqu\u00edn","family":"Soriano\u2010L\u00f3pez","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular (ICMol) Universitat de Val\u00e8ncia  Catedr\u00e1tico Jos\u00e9 Beltr\u00e1n 2 46980 Paterna Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,11,6]]},"reference":[{"key":"e_1_2_9_1_1","first-page":"1","volume-title":"Polyoxometalate Chemistry From Topology via Self-Assembly to Applications","author":"Pope M. 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