{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T06:01:15Z","timestamp":1788328875206,"version":"build-2803163510"},"reference-count":41,"publisher":"Wiley","issue":"13","license":[{"start":{"date-parts":[[2007,1,24]],"date-time":"2007-01-24T00:00:00Z","timestamp":1169596800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2007,4,27]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Equilibrium constants (<jats:italic>K<\/jats:italic>) for reactions between acids and the conjugate base forms of a number of phosphonium salts, [HPR<jats:sub>3<\/jats:sub>][BF<jats:sub>4<\/jats:sub>], and iron hydrides, [Fe(CO)<jats:sub>3<\/jats:sub>H(PR<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub>][BF<jats:sub>4<\/jats:sub>], in CD<jats:sub>2<\/jats:sub>Cl<jats:sub>2<\/jats:sub> have been determined by means of <jats:sup>31<\/jats:sup>P and <jats:sup>1<\/jats:sup>H\u2005NMR spectroscopy at 20\u2009\u00b0C. The anchor compound chosen for p<jats:italic>K<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sup-3.gif\" xlink:title=\"urn:x-wiley:09476539:media:CHEM200601484:tex2gif-sup-3\"\/> determinations was [HPCy<jats:sub>3<\/jats:sub>][BF<jats:sub>4<\/jats:sub>] with a p<jats:italic>K<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sup-4.gif\" xlink:title=\"urn:x-wiley:09476539:media:CHEM200601484:tex2gif-sup-4\"\/> value of 9.7, as assigned by literature convention (Cy: cyclohexyl). A continuous scale of p<jats:italic>K<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sup-5.gif\" xlink:title=\"urn:x-wiley:09476539:media:CHEM200601484:tex2gif-sup-5\"\/> values covering the range from 9.7 to \u22123 was created and correlated with the \u0394<jats:italic>H<\/jats:italic> values reported by Angelici and co\u2010workers and literature p<jats:italic>K<\/jats:italic><jats:sub>a<\/jats:sub> values. The p<jats:italic>K<\/jats:italic><jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"graphic\/tex2gif-sup-6.gif\" xlink:title=\"urn:x-wiley:09476539:media:CHEM200601484:tex2gif-sup-6\"\/> values for 15 other hydride or dihydrogen complexes of the iron group elements and of diethyl ether were also placed on this scale. The crystal structures of [Fe(CO)<jats:sub>3<\/jats:sub>H(PCy<jats:sub>2<\/jats:sub>Ph)<jats:sub>2<\/jats:sub>][BF<jats:sub>4<\/jats:sub>] and [Fe(CO)<jats:sub>3<\/jats:sub>(PCy<jats:sub>2<\/jats:sub>Ph)<jats:sub>2<\/jats:sub>] revealed that the <jats:italic>trans<\/jats:italic>\u2010oriented, bulky, unsymmetrical phosphane ligands distort the equatorial plane of the complexes. The acidity of iron carbonyl hydrides is an important feature of the reactions of iron hydrogenase enzymes.<\/jats:p>","DOI":"10.1002\/chem.200601484","type":"journal-article","created":{"date-parts":[[2007,1,24]],"date-time":"2007-01-24T05:27:03Z","timestamp":1169616423000},"page":"3796-3803","source":"Crossref","is-referenced-by-count":32,"title":["An Acidity Scale of Tetrafluoroborate Salts of Phosphonium and Iron Hydride Compounds in 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