Four μ-2-chloroterephthalato binuclear iron(Ⅱ) complexes, namely [Fe2 (CTPHA) L4]-(ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 2,9-dimethyl-l, 10-phenanthro-line (Me2-phen); 5-chloro-...Four μ-2-chloroterephthalato binuclear iron(Ⅱ) complexes, namely [Fe2 (CTPHA) L4]-(ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 2,9-dimethyl-l, 10-phenanthro-line (Me2-phen); 5-chloro-l, 10-phenanthroline (Cl-phen); 4, 7-diphenyl-l, 10-phenanthroline (Ph2-phen), respectively, and CTPHA represents 2-chlorolerephthalate dianion, have been synthesized and characterized. Based on the elemental analyses, molar conductance measurements and spectroscopic studies, extended CTPHA-bridged structures consisting of two iron(Ⅱ) ions, each in a distorted octahedral environment, are proposed for these complexes. [Fe2 CTPHA)-(Me2-bpy)4] (ClO2 (1) and [Fe2(CT-PHA)·(Me2-phen)4](ClO4)2 (2) complexes were characterized by variable temperature magnetic susceptibility (4-300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = - 2JS1 · S2 , giving the exchange integrals J = - 1.28 cm-1 for 1 and J = - 1.85 cm-1 for 2. These results indicate the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule.展开更多
A mixed-ligand copper(Ⅱ) complex [Cu_2 (phen)_2 (HL^1 )_2]-(ClO_4)_2 (1) wassynthesized. X-ray analyses reveal that 1 has a bis (μ_2-phenoxo)-bridged dicopper(Ⅱ) structure.2D hydrogen-bonded network is formed utili...A mixed-ligand copper(Ⅱ) complex [Cu_2 (phen)_2 (HL^1 )_2]-(ClO_4)_2 (1) wassynthesized. X-ray analyses reveal that 1 has a bis (μ_2-phenoxo)-bridged dicopper(Ⅱ) structure.2D hydrogen-bonded network is formed utilizing the N―H, O―H and C―H groups of the (HL^1)^-ligands (H_2L^1 = N-(2-hydroxybenzyl) ethanolamine), the C―H groups of the phenan-throlines and theperchlorate anions. Variable temperature magnetic properties of 1 have shown comparatively weakanti-ferromagnetic interactions with respect to the bridge angles, which have been ascribed to theunfavorable overlaps of the magnetic orbitals for the highly distorted copper coordination polyhedraand the pyramidal distortions at the phenoxo oxygen atoms.展开更多
基金Natural Science Foundation of Shandong Province (No. Y97-D17076)National Natural Science Foundation of China (No. 29631040).
文摘Four μ-2-chloroterephthalato binuclear iron(Ⅱ) complexes, namely [Fe2 (CTPHA) L4]-(ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 2,9-dimethyl-l, 10-phenanthro-line (Me2-phen); 5-chloro-l, 10-phenanthroline (Cl-phen); 4, 7-diphenyl-l, 10-phenanthroline (Ph2-phen), respectively, and CTPHA represents 2-chlorolerephthalate dianion, have been synthesized and characterized. Based on the elemental analyses, molar conductance measurements and spectroscopic studies, extended CTPHA-bridged structures consisting of two iron(Ⅱ) ions, each in a distorted octahedral environment, are proposed for these complexes. [Fe2 CTPHA)-(Me2-bpy)4] (ClO2 (1) and [Fe2(CT-PHA)·(Me2-phen)4](ClO4)2 (2) complexes were characterized by variable temperature magnetic susceptibility (4-300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = - 2JS1 · S2 , giving the exchange integrals J = - 1.28 cm-1 for 1 and J = - 1.85 cm-1 for 2. These results indicate the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule.
基金ProjectsupportedbytheNaturalScienceFoundationofAnhuiProvince (No .0 10 45 40 8)
文摘A mixed-ligand copper(Ⅱ) complex [Cu_2 (phen)_2 (HL^1 )_2]-(ClO_4)_2 (1) wassynthesized. X-ray analyses reveal that 1 has a bis (μ_2-phenoxo)-bridged dicopper(Ⅱ) structure.2D hydrogen-bonded network is formed utilizing the N―H, O―H and C―H groups of the (HL^1)^-ligands (H_2L^1 = N-(2-hydroxybenzyl) ethanolamine), the C―H groups of the phenan-throlines and theperchlorate anions. Variable temperature magnetic properties of 1 have shown comparatively weakanti-ferromagnetic interactions with respect to the bridge angles, which have been ascribed to theunfavorable overlaps of the magnetic orbitals for the highly distorted copper coordination polyhedraand the pyramidal distortions at the phenoxo oxygen atoms.
