Structural and Optical Properties of Er(III) Complex with ODA and Phen (ODA = Oxydiacetate, Phen = 1,10-Phenanthroline)

A novel Er(III) complex with oxydiacetate and 1,10-phenanthroline was synthesized and its structure and luminescence properties were characterized. The complex of [Er(ODA)·(phen)·4H2O]+ crystallizes in the monoclinic space group P21/n with a = 12.216(4) A, b = 16.680(2) A, c = 12.627(3) A, β = 108.30(2) .deg. , V = 2442.7(11) A3, Z = 4 and ρ = 1.841 g/cm3. When the complex is excited at the He-Cd 325-nm line, it produces two broad bands spanning the regions 350-650 nm and 1200-1650 nm. The emission band of the complex is characterized by a series of spectral dips in the visible emission profile. The complex exhibits sensitized near-IR emission via two kinds of energy transfers from phen to Er(III): nonradiative and radiative energy transfers