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The photophysical properties and the linear and nonlinear spectra of these compounds have been investigated. An edge\u2010to\u2010face conformation resulting in the formation of an excimer was confirmed by fluorescence lifetime measurements of these multichromophoric derivatives. Upon complexation with heavy metal ions such as Pb<jats:sup>2+<\/jats:sup> and Cd<jats:sup>2+<\/jats:sup>, a red shift of the one\u2010 and two\u2010photon excitation spectra was observed in the absorption and emission spectra. Furthermore, enhancement of the electron\u2010withdrawing character of the phosphane oxide resulted in a significant enhancement of the two\u2010photon absorption cross\u2010section, leading to the first biphotonic Cd<jats:sup>2+<\/jats:sup> sensors combining high affinity for Cd<jats:sup>2+<\/jats:sup>, large two\u2010photon absorption cross\u2010sections, and significant enhancement of the two\u2010photon excited fluorescence in the presence of the cation. Such derivatives are highly promising for incorporation into devices for the detection of heavy metal ions in water and effluents.<\/jats:p>","DOI":"10.1002\/chem.200800084","type":"journal-article","created":{"date-parts":[[2008,5,15]],"date-time":"2008-05-15T18:16:45Z","timestamp":1210875405000},"page":"5941-5950","source":"Crossref","is-referenced-by-count":32,"title":["Synthesis, Fluorescence, and Two\u2010Photon Absorption of Bidentate Phosphane Oxide Derivatives: Complexation with Pb<sup>2+<\/sup> and Cd<sup>2+<\/sup> 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