Metal‐Ion Sensing Europium(III) Complexes with Bidentate Phosphine Oxide Ligands Containing a 2,2′‐Bipyridine Framework

Abstract

Abstract Novel Eu III complexes with bidentate phosphine oxide ligands containing a bipyridine framework, i.e. , [3,3′‐bis(diphenylphosphoryl)‐2,2′‐bipyridine]tris(hexafluoroacetylacetonato)europium(III) ([Eu(hfa) 3 (BIPYPO)]) and [3,3′‐bis(diphenylphosphoryl)‐6,6′‐dimethyl‐2,2′‐bipyridine]tris(hexafluoroacetylacetonato)europium(III) ([Eu(hfa) 3 (Me‐BIPYPO)]), were synthesized for lanthanide‐based sensor materials having high emission quantum yields and effective chemosensing properties. The emission quantum yields of [Eu(hfa) 3 (BIPYPO)] and [Eu(hfa) 3 (Me‐BIPYPO)] were 71 and 73%, respectively. Metal‐ion sensing properties of the Eu III complexes were also studied by measuring the emission spectra of Eu III complexes in the presence of Zn II or Cu II ions. The metal‐ion sensing and the photophysical properties of luminescent Eu III complexes with a bidentate phosphine oxide containing 2,2′‐bipyridine framework are demonstrated for the first time.