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Compound <jats:bold>1\u2009s<jats:sub>olv<\/jats:sub><\/jats:bold> exhibited a gradual electron\u2010transfer\u2010coupled spin transition (ETCST), and the removal of solvent molecules led to an abrupt thermal ETCST behavior with increased transition temperature. X\u2010ray structural analysis revealed that the modification of ETCST was caused by a significant alteration of a hydrogen\u2010bonding mode between the tetranuclear [Co<jats:sub>2<\/jats:sub>Fe<jats:sub>2<\/jats:sub>]<jats:sup>2+<\/jats:sup> cations and ABA molecules. Variable temperature IR measurements indicated that the desolvated form, <jats:bold>1\u2009d<jats:sub>esolv<\/jats:sub><\/jats:bold>, showed dynamic alteration of hydrogen\u2010bonding interactions coupled with thermal ETCST behavior. These results suggested that the tetranuclear [Co<jats:sub>2<\/jats:sub>Fe<jats:sub>2<\/jats:sub>] complex shows solid\u2010state modulations of hydrogen\u2010bond strengths by external stimuli.<\/jats:p>","DOI":"10.1002\/chem.201901383","type":"journal-article","created":{"date-parts":[[2019,3,28]],"date-time":"2019-03-28T08:50:06Z","timestamp":1553763006000},"page":"7449-7452","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":35,"title":["Solid\u2010State Hydrogen\u2010Bond Alterations in a [Co<sub>2<\/sub>Fe<sub>2<\/sub>] Complex with Bifunctional Hydrogen\u2010Bonding Donors"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3461-0187","authenticated-orcid":false,"given":"Masayuki","family":"Nihei","sequence":"first","affiliation":[{"name":"Department of Chemistry Faculty of Pure and Applied Sciences University of Tsukuba  Tennodai 1-1-1 Tsukuba Ibaraki 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