New dinuclear lanthanide(III) complexes based on 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione and 2,2′-bipyrimidine

Reaction of mononuclear Ln(fod)3 chelates (where fod is the anion of 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione and Ln = Nd, Eu, Tb and Lu) with potentially bridging ligand 2,2′-bipyrimidine (bpm) in 2:1 mole ratio in ethanol afforded new dinuclear lanthanide complexes of the form [Ln(fod)3-(μ-bpm)-Ln(fod)3]. Neodymium complex is one of the rare bipyrimidine-bridged dinuclear complexes. The absorption spectrum of the neodymium complex displays characteristic hypersensitive as well as non-hypersensitive transitions. The excitation of Eu–Eu and Tb–Tb complexes at 355 nm produces an intense red and green luminescence, respectively.

Graphical abstractReaction of mononuclear Ln(fod)3 chelates (where fod is the anion of 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione and Ln = Nd, Eu, Tb and Lu) with potentially bridging ligand 2,2′-bipyrimidine (bpm) in ethanol in 2:1 molar ratio afforded new dinuclear lanthanide complexes. Neodymium complex is one of the rare bpm bridged dinuclear complexes. These complexes are thermally more stable than their mononuclear analogues with 1,10-phenanthroline and 2,2′-bipyridyl.Figure optionsDownload full-size imageDownload as PowerPoint slide