Photophysical and Magnetic Properties in Complexes Containing 3d/4f Elements and Chiral Phenanthroline-Based Helicate-Like Ligands

摘要: The reactions between the chiral helicene-like ligand (L) and either Ln(hfac)(3)2H(2)O (hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate), Ln(tta)(3)2H(2)O (tta(-) 2-tenoyltrifluoroacetonate), iron(II) sulfate or chloride, a combination of them led to formation five 4f compounds formula [HL][Ln(hfac)(4)]nCH(2)Cl(2) [Ln Dy, n 0.5 (1) Ln Yb, 1 (2)], [HL][Ln(tta)(4)]nC(6)H(14) 0 (3) 2.5 (4)], [HL](2)[Yb-8(hfac)(12)(OH)(12)(O)]0.5C(6)H(14)H(2)O (5), 3d complex [Fe(NCS)(2)(L)]CH3NO2 (6), 3d/4f heterodimetallic compound [Fe(tta)(L)][Dy(tta)(4)]2.5CH(2)Cl(2) (7). influence nature ancillary presence absence base during synthesis on homochiral heterochiral arrangement ligands as well dimensionality nuclearity complexes were studied. Ytterbium-based 2, 4, 5 display near-infrared (NIR) luminescence under irradiation at 350 nm owing F-2(5/2) F-2(7/2) Yb-III transition (centered 1000 nm). Complex 2 displays second NIR emission 1278 nm, which is attributed singlet-oxygen phosphorescence (a(g)(1) X-3 sigma(-)(g)) both room temperature 77 K. Dynamic magnetic measurements show an out-of-phase signal for susceptibility 7, can be depicted single-molecule magnet.