New hetero-dilanthanide complexes containing Ln(1)(fod)(3) and Ln(2)(fod)(3) fragments (Ln=Pr-Nd; Nd-Sm; Eu-Tb and Ho-Er) linked by bis-diimine bridging ligand

作者：Irfanullah Mir; Iftikhar K^*

来源：Inorganic Chemistry Communications, 2010, 13(6): 694-698.

DOI：10.1016/j.inoche.2010.03.021

• Hetero-dilanthanide complex
• NMR
• 4f-4f absorption
• Tb(III) -> Eu(III) energy transfer
• Luminescence

New hetero-dilanthanide beta-diketonate complexes of the type [Ln(1)Ln(2)(fod)(6)(mu-bpm)] (fod is the anion of 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione; bpm = 2,2'-bipyrimidine; Ln(1) = Pr and Ln(2) = Nd (1); Ln(1) = Nd and Ln(2) = Sm (2); Ln(1) = Eu and Ln(2) = Tb (3) and Ln(1) = Ho and Ln(2) = Er (4)) have been isolated by reacting sequentially, the coordinatively unsaturated Ln(fod)(3) chelates of two different lanthanides and 2,2'-bipyrimidine bridging ligand in 1:1:1 molar ratio, in ethanol. The purity and hetero-dilanthanide nature of the complexes has been confirmed by NMR, 4f-4f absorption spectroscopies and electrospray mass spectrometry. The oscillator strength of the hypersensitive transitions confirms the presence of the two different lanthanides in the complexes in 1:1 ratio. The complexes 2 and 3 display strong pink and red luminescences, respectively. The intramolecular Tb(III) -> Eu(III) energy transfer has been observed in complex 3.

• 出版日期2010-6