Synthesis and magnetic properties of binuclear iron(III) complexes with oxalate, 2,5-dihydroxy-1,4-benzoquinone dianion, and squarate as bridging ligands. Crystal structure of (.mu.-1,3-squarato)bis[(N,N'-ethylenebis(salicylideneaminato))(methanol)iron(III)]

Abstract A mixture of three isomeric clusters of composition Mo3WS4(Et2PS2)6 (3) is obtained by reacting equimolar quantities of Mo3S4(Et2PS2)4, W(CO)3(CH3CN)3 and [Et2P(S)]2S2 in toluene'. Some NMR-spectroscopic data and the magnetic properties of these isomers are reported. Isomer 3a consists of a distorted cubane Mo3WS4, each metal of which is coordinated by six S atoms: three of them belonging to the cubane, one to a bridging and two to a chelating ligand Et2PS2-. The crystal structure of isomer 3b is reported. In 3b only three of the metals in the core are coordinated in this manner while the fourth is surrounded by three S of the cubane and three S of bridging ligands. 3b crystallizes in the orthorhombic space group Pbca, Z = 8. lattice parameters a = 2184,4(8), b = 2264,4(9). c = 2388.2(8) pm. The crystal structure was refined to R = 0.05 using 5398 observed reflections. By HPLC 3b can be separated into two isomers. 3b1 and 3b2, both differing in the type of metal. Mo or W. bonded to the three bridging ligands

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Synthesis, crystal structure and magnetic properties of dinuclear manganese(II) diketonate with cyanopyridine-N-oxide bridging ligands [Mn(hfac)2(4-cpyNO)]2

Polyhedron ◽

10.1016/j.poly.2003.12.010 ◽

2004 ◽

Vol 23 (5) ◽

pp. 879-883 ◽

Cited By ~ 7

Author(s):

Mikhail Ryazanov ◽

Sergey Troyanov ◽

Marek Baran ◽

Ritta Szymczak ◽

Natalia Kuzmina

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Bridging Ligands

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Crystal Structure and Magnetic Properties of a (μ-Hydroxo)(μ-acetato) Dicopper(II) Complex

Zeitschrift für Naturforschung B ◽

10.1515/znb-2000-0702 ◽

2000 ◽

Vol 55 (7) ◽

pp. 561-566 ◽

Cited By ~ 8

Author(s):

E. Kavlakoglu ◽

A. Elmali ◽

Y. Elerman ◽

H. Fuess

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Magnetic Susceptibility ◽

Antiferromagnetic Coupling ◽

Monoclinic Space Group ◽

Helium Temperature ◽

Temperature Dependent ◽

Bridging Ligands ◽

Square Planar ◽

Super Exchange Interaction

[Cu2(L)(O2CMe)] · H2O (L = 1,3-Bis(2-Hydroxy-1-napthylideneamino)propan-2-ol) was synthesized and its crystal structure determined. (C27H23N2O5Cu2).H2O , monoclinic, space group P21/c, a = 11.795(3), b = 17.988(5), c = 12.005(6) Å, β = 109.99(3)°, V = 2393(2) Å3, Z = 4. Two copper(II) ions in a square-planar coordination are bridged by alkoxide and acetate oxygen atoms to form a dinuclear unit. The metal coordination sphere is four-coordinate, planar with an NO3 donor set. The dihedral angle between the two coordination planes is 6.34(9)°. The copper(II) centers are separated by 3.492(2) Å and weakly antiferromagnetically coupled (-2J = 163.6 cm-1 ), which follows from temperature-dependent magnetic susceptibility measurements in the temperature range 4.6 to 310 K. The Cu-O-Cu angle is 133.5(1)° in the super-exchange pathway. The weak antiferromagnetic coupling of the complex is interpreted in terms of countercomplementary effects of the different bridging ligands which participate in the super-exchange interaction. The magnetic moment at 310 K is ca. 2.7 B. M., but 0.2 B. M. at 4.6 K. The magnetic susceptibility is at a maximum near 140 K and decreases rapidly as the temperature is lowered to liquid helium temperature.

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