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Previously, this blueshift was attributed, among others, to the contraction of the H\u2212C bonds as the H<jats:sub>3<\/jats:sub>C moiety becomes less pyramidal. Herein, we provide quantitative evidence that, instead, the blueshift arises from a direct and strong X<jats:sup>\u2212<\/jats:sup>\u2022\u2022\u2022C interaction of the HOMO of A<jats:sup>\u2212<\/jats:sup> with the backside lobe on carbon of the low\u2010lying C\u2212Y antibonding \u03c3* LUMO of the H<jats:sub>3<\/jats:sub>C\u2212Y fragment. This X<jats:sup>\u2212<\/jats:sup>\u2022\u2022\u2022C bond, in essence a tetrel bond, pushes the H atoms towards a shorter H\u2212C distance and makes the H<jats:sub>3<\/jats:sub>C moiety more planar. The blueshift may, therefore, serve as a diagnostic for tetrel bonding.<\/jats:p>","DOI":"10.1002\/cphc.202300480","type":"journal-article","created":{"date-parts":[[2023,10,21]],"date-time":"2023-10-21T11:23:37Z","timestamp":1697887417000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Blueshift in Trifurcated Hydrogen Bonds: A Tradeoff between Tetrel Bonding and Steric Repulsion"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4040-1728","authenticated-orcid":false,"given":"Lucas","family":"de Azevedo Santos","sequence":"first","affiliation":[{"name":"Department of Chemistry and Pharmaceutical Sciences AIMMS Vrije Universiteit  Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8177-1496","authenticated-orcid":false,"given":"Storm","family":"van der Voort","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Pharmaceutical Sciences AIMMS Vrije Universiteit  Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiri R.","family":"Burema","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Pharmaceutical Sciences AIMMS Vrije Universiteit  Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2973-5321","authenticated-orcid":false,"given":"C\u00e9lia","family":"Fonseca Guerra","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Pharmaceutical Sciences AIMMS Vrije Universiteit  Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4655-7747","authenticated-orcid":false,"given":"F. 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