The title complex Eu(Pic)3(TTD) crystallizes in space group Pcab with a = 23.714(4), b = 29.245(6), c = 32.035(8)Å, V = 22216(7)Å3, Z = 16, Dc = 1.63 g cm-1, w = 12.5 cm-1, F(000) = 10976 and its structure was solved and refined to R = 0.083. Two crystallographically different Eu(Pic)3(TTD) units, in which the coordination numbers of two central ions (Eu1 and Eu2) are nine and ten, respectively, are present in the asymmetric unit. In the 7F0 → 5D0 excitation spectrum of the complex, there are two sharp peaks at 578.5 and 579.0 nm indicating that the complex has two Eu(III) sites. Two different patterns in the 5D0 → 7Fj (j = 1-4) luminescence spectrum have been observed (selectively excited 5D0), which further reveals the existence of two Eu(III) sites compatible with the result of the structure determination.
Crystal Structure and Fluorescence Spectra of A Complex of Europium Picrate with N,N,N′,N′-tetraphenyl-3,6,9-trioxaundecanediamide
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