Terbium Triangle Bridged by a Triazole Nitronyl Nitroxide Radical with Single-Molecule-Magnet Behavior.

An unprecedented cyclic Tb-radical cluster, [Tb(hfac)(4-Me-3-NITtrz)(OH)] (), has been self-assembled from Tb(hfac)·2HO and 4-Me-3-NITtrz in the presence of Cu(hfac)·2HO. Alternating-current magnetic studies show that the Tb cluster displays a dual slow relaxation of magnetization behavior under a zero direct-current (dc) field and a single relaxation process under an induced dc field with an effective energy barrier of 14 K, representing the first triangle 2p-4f cluster with a slow magnetic relaxation property.

Synthesis of a series of hetero-multi-spin LnCu complexes based on a methyl-pyrazole nitronyl nitroxide radical with slow magnetic relaxation behaviors.

Multinuclear hetero-tri-spin complexes based on a methyl-pyrazole nitronyl nitroxide radical, namely, [Ln2Cu3(hfac)12(4-NIT-MePyz)4] (Ln = Gd(1), Tb(2), Dy(3); hfac = hexafluoroacetylacetone; 4-NIT-MePyz = 2-{4-(1-methyl)-pyrazolyl}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been successfully obtained through a one-pot reaction of the radical ligand (4-NIT-MePyz) with Cu(hfac)2 and Ln(hfac)3. These 2p-3d-4f complexes exhibit five-nuclear structures with the sequence [Cu-Rad-Ln-Rad-Cu-Rad-Ln-Rad-Cu], in which each 4-NIT-MePyz radical acting as a bidentate bridging ligand is coordinated to one Ln(hfac)3 unit through one oxygen atom of the NO groups and to one Cu(hfac)2 unit with one nitrogen atom from the pyrazole ring. For complex 1, based on the spin Hamiltonian calculations and MAGPACK program, it is concluded that there exist ferromagnetic couplings between GdIII and NIT radicals, as well as between CuII and free radicals with J1 = 6.

Two 3D Cobalt(II) Metal-Organic Frameworks with Micropores for Selective Dye Adsorption.

Two porous coordination polymers, {[Co(TBC)]·2DMF} (1) and {[Co(TBC)Cl(CHOH)]·0.5Cl} (2), were synthesized via the solvothermal reaction of cobalt(II) salts and 3,5-bis(1 H-1,2,4-triazol-1-yl)benzenecarboxylic acid. Single-crystal X-ray diffraction analyses exhibited that complex 1 contains rtl three-dimensional (3D) skeleton and one-dimensional channels with large apertures, while complex 2 displays a novel 2-nodal 3,6-linked 3D structure with a Schläfli sign of {4.

Slow relaxation of the magnetization observed in mononuclear Ln-radical compounds with D geometry configurations.

The combination of LnIII ions (GdIII, TbIII or DyIII) and a pyrazole nitronyl nitroxide radical results in three isomorphous complexes, namely, [Ln(hfac)3(NIT-Pyz)]2 (Ln = Gd(1), Tb(2), Dy(3); hfac = hexafluoroacetylacetone; NIT-Pyz = 2-{3-pyrazolyl}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide). Single crystal X-ray diffraction studies revealed that all of them are composed of two crystallographically independent mononuclear systems, in which the central LnIII ions are coordinated by three hfac and one bidentate chelating NIT-Pyz radical. The central LnIII ions are all in square antiprism geometry (D4d) polyhedron configurations.

Lanthanide Tetranuclear Cage and Mononuclear Cocrystalline Nitronyl Nitroxide Complex with Single-Molecule-Magnet Behavior.

The first tetranuclear metallacage and mononuclear cocrystalline Dy-radical complex was synthesized and characterized. The metallacage in [Dy(hfac)(IMPhThio)(OH)][Dy(hfac)(NITPhThio)] consists of Dy(hfac) groups bridged by OH and the IMPhThio radical. Field-induced single-molecule-magnet behavior was observed in the nitronyl nitroxide radical-bridged polynuclear complex.

A family of multi-spin rare-earth complexes based on a triazole nitronyl nitroxide radical: synthesis, structure and magnetic properties.

The combination of Ln ions (Gd, Tb or Dy) and a triazole nitronyl nitroxide radical (4-Me-3-NITtrz) as spin carriers results in two mononuclear and one binuclear compounds, namely, [Ln(hfac)(4-Me-3-NITtrz)(HO)] (Ln = Gd(1), Tb(2); hfac = hexafluoroacetylacetone; 4-Me-3-NITtrz = 2-[3-(4-methyl-l,2,4-triazolyl)]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) and [Dy(hfac)(4-Me-3-NITtrz)][Dy(hfac)]·CHCl. Compounds 1 and 2 are isostructural and crystallize in the 1̄ space group, whereas compound 3 crystallizes in the 2/ space group. In 1 and 2, the central Ln ions are nine-coordinated (LnNO) in a distorted spherical capped square antiprism geometry ( ) finished by three bischelate hfac anions and one bidentate triazole radical and one aqua molecule.

[Clinical applications of the postfemur island flap pedicled with the postfemur neurocutaneous nutrient vessel].

Objective: To investigate the application of the island flap based on the postfemur neurocutaneous nutrient vessel.

Methods: The flap was designed and applied to repair the defects in the gluteal, popliteal fossa or the bilateral postfemur areas. A total of 11 cases (12 defects) were treated with this method.