Structure and properties of terbium(III) dipivaloylmethanate and its adducts with Bipy and Phen

Abstract

The complex of terbium(III) with dipivaloylmethane (2,2,6,6-tetramethylheptane-3,5-dione = Htmhd) [Tb(tmhd)3]2 (1) and two its adducts with bipyridyl (Bipy) and phenanthroline (Tb(tmhd)3·Bipy (2) and Tb(tmhd)3·Phen (3)) are synthesized and analyzed by single crystal X-ray diffraction. The crystals of [Tb(tmhd)3]2 (1) belong to the monoclinic crystal system: P21/n space group, a = 12.2238(2) A, b = 27.6369(5) A, c = 21.8740(4) A, β = 105.146(1)°, V = 7133.0(2)A3, Z = 4; the crystals of Tb(tmhd)3·Bipy (2) and Tb(tmhd)3·Phen (3) belong to the triclinic crystal system with unit cell parameters: (2) \(P\bar 1\) space group, a = 11.0554(6) A, b = 12.2761(7) A, c = 17.7096(8) A, α = 77.457(2)°, β = 85.557(2)°, γ = 69.659(2)°, V = 2199.8(2) A3, Z = 2; (3) \(P\bar 1\) space group, a = 10.8814(3) A, b = 12.2852(4) A, c = 18.3590(6) A, α = 80.463(1)°, β = 87.587(1)°, γ = 68.640(1)°, V = 2253.6(1) A3, Z = 2. The structures of the complexes are molecular and involve isolated [Tb2(tmhd)6] (1), Tb(tmhd)3·Bipy (2), and Tb(tmhd)3·Phen (3) molecules. The thermal properties of the obtained terbium complexes are studied by TG-DTA.