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Four Ln( III) complexes based on a new nitronyl nitroxide radical have been synthesized and structurally characterized: {Ln(hfac)3[ NITPh(MeO)2]2} (Ln = Eu( 1), Gd( 2), Tb( 3), Dy( 4); NITPh(MeO)2 = 2-(3′,4′-dimethoxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; hfac = hexafluoroacetylacetonate). The single-crystal X-ray diffraction analysis shows that these complexes have similar mononuclear trispin structures, in which central Ln( III) ion is eight-coordinated by two O-atoms from two nitroxide groups and six O-atoms from three hfac anions. The variable temperature magnetic susceptibility study reveals that there exist ferromagnetic interactions between Gd( III) and the radicals, and antiferromagnetic interactions between two radicals ( JGd-Rad = 3.40 cm−1, JRad-Rad = −9.99 cm−1) in complex 2. Meanwhile, antiferromagnetic interactions are estimated between Eu( III) (or Dy( III)) and radicals in complexes 1 and 4, and ferromagnetic interaction between Tb( III) and radicals in complex 3, respectively. [ABSTRACT FROM AUTHOR]

The title compound {[Co2(NIT4Py)4(fum)2(H2O)4] · (H2O)2}n, where NIT4Py = 2-(4'-pyridinyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide and fum = fumarate, was prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.8853(9) Å, b = 13.2167(13) Å, c = 13.8481(12) Å, α = 68.5400(10)°, β = 73.467(2)°, γ = 74.596(2)°, V = 1587.6(3) Å3, Z = 1, and R1 [I > 2σ(I)] = 0.0662. The complex consists of two kinds of neutral infinite 1-D chains, in which [Co(NIT4Py)2(H2O)2] moieties are connected by fumarate anions in a bis-monodentate mode. These 1-D chains are further connected by hydrogen bonds, generating a 2-D network. The variable temperature magnetic susceptibility measurement reveals that the magnetic couplings between Co(II) and NIT4Py are weak antiferromagnetic interactions. [ABSTRACT FROM AUTHOR]

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A convenient and efficient method for the synthesis of 1,5‐benzodiazepines by the reaction of o ‐phenylenediamines (OPDA) and ketones with hydrogens at the α‐position has been developed. The reaction is carried out at room in the presence of a catalytic amount of magnesium perchlorate under solvent‐free conditions. [ABSTRACT FROM AUTHOR]