Synthesis, Structure and Near-infrared Luminescence of a Dinuclear Ytterbium(Ⅲ) Complex with a Bis(2,2'-bipyridyl) Ligand

摘要

The title complex {Yb(hfac)3}2(bpyC≡CC6H4C≡Cbpy) (hfac = hexafluoroacetyl- acetonate,bpyC≡CC6H4C≡Cbpy=2-(pyridin-2-yl)-5-(2-(4-(2-(6-(pyridin-2-yl)pyridin-3-yl)ethynyl)- phenyl)ethynyl)pyridine) has been prepared and characterized by X-ray crystallography. It crystallizes in the monoclinic space group P21/c with a = 17.240(16), b = 25.64(2), c = 16.481(15) , β = 93.469(9)°, V = 7271(12) 3, Z = 4, Mr = 2022.91, F(000) = 3888, Dc = 1.848 g/cm3 and μ(MoKα) = 2.708 mm–1. The structure was refined to R = 0.0714 and wR = 0.1762 for 9771 observed reflections (I > 2σ(I)). Sensitized near-infrared (NIR) luminescence from YbIII centers was achieved through efficient antenna effect or energy transfer from the bridging ligand chromophore.