Crystal structure and luminescence of a terbium complex with p-methyl benzoate and 1,10-phenanthroline

Abstract

A terbium p-methyl benzoate complex with 1,10-phenanthroline, [Tb(p-MBA)3(Phen)]2 (p-MBA = p-methyl benzoate and Phen = 1,10-phenanthroline), has been prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic system, space group P\( \bar 1 \) with a = 12.8064(12), b = 13.3589(12), c = 19.8277(19) A, α = 91.668(2)°, β = 97.775(2)°, γ = 106.312(2)°, C72H58N4O12Tb2, Mr = 1489.06, V = 3217.6(5) A3, Z = 2, ρc = 1.537 g/cm3, μ(MoKα) = 2.246 mm−1, F(000) = 1488, the final R = 0.0622 and wR = 0.0962 for 14128 independent reflections with Rint = 0.0843. It consists of two types of crystallographically independent dimeric molecules [Tb(p-MBA)3(Phen)]2 noted as [Tb-1] and [Tb-2]. In the dimeric molecule [Tb-1], each Tb(III) is eight-coordinated with one Phen molecule, two bridging carboxylate groups, and two bidentate chelating carboxylate groups, while in [Tb-2] each Tb(III) is eight-coordinated with one Phen molecule, four bridging carboxylate groups, and one bidentate chelating carboxylate group. The title complex shows intense green luminescence under UV light at room temperature.