Journal ArticleX-ray crystallographic, luminescence and NMR studies of phenacyldiphenylphosphine oxide with the Ln( <scp>iii</scp> ) ions Sm, Eu, Gd, Tb and DyG. Leach, Erin; Shady, Justin R.; Boyden, Adam C.; Emig, Anne-lise; Henry, Alyssa T.; Connor, Emily K.; Staples, Richard J.; Schaertel, Stephanie; Werner, Eric J.; Biros, Shannon M.We report here the characterization in solution (NMR, luminescence, MS) and the solid-state (X-ray crystallography, IR) of complexes between phenacyldiphenylphosphine oxide and five Ln( iii ) ions (Sm, Eu, Gd, Tb, Dy). Four single crystal X-ray structures are described here showing a 1 : 2 ratio between the Ln 3+ ions Eu, Dy, Sm and Gd and the ligand, where the phosphine oxide ligands are bound in a monodentate manner to the metal center. A fifth structure is reported for the 1 : 2 Eu(NO 3 ) 3 -ligand complex showing bidentate binding between the two ligands and the metal center. The solution coordination chemistry of these metal complexes was probed by 1 H, 13 C and 31 P NMR, mass spectrometry, and luminescence experiments. The title ligand has the capability to sensitize Tb 3+ , Dy 3+ , Eu 3+ and Sm 3+ leading to metal-centered emission in solutions of acetonitrile and methanol and in the solid state.2017-01-0110063353Dalton Transactions464415458 to 154691477-9226https://doi.org/10.1039/c7dt02678a1725699National Science Foundation