Synthesis and crystal structure of the Tb(III) complex with 1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione and 1,10-phenanthroline

Abstract

The reaction of Tb(NO3)3 · 6H2O with 1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedi-one (HL) and 1,10-phenanthroline (Phen) in the presence of NaOH in a water-alcohol medium afforded the neutral complex [Tb(L)3(Phen)] (I). The unstable adduct [Tb(L)3(Phen)] · 0.4 MeCN (II), whose structure is studied by X-ray diffraction analysis, is obtained from an acetonitrile solution. The crystals of compound II at 100 K are triclinic, a = 11.2508(13), b = 11.4246(14), c = 22.486(3) A, α = 96.522(2)°, β = 91.578(2)°, γ = 110.073(2)°, V = 2690.3(5) A3, space group P $$\bar 1$$ , Z= 2, R = 0.0433. The complex is characterized by the green luminescence (λexc = 380 nm, λem = 550 nm).