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

2000 ◽  
Vol 55 (7) ◽  
pp. 561-566 ◽  
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.

Crystal Structure and Magnetic Properties of a Binuclear Copper(II) Complex Bridged by an Alkoxo-oxygen Atom and an Acetate Ion

2000 ◽  
Vol 55 (11) ◽  
pp. 1067-1073 ◽  
Author(s):  
C. T. Zeyrek ◽  
A. Elmali ◽  
I. Svoboda ◽  
H. Fuess
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Planar Geometry ◽  
Monoclinic Space Group ◽  
Ferromagnetic Coupling ◽  
Binuclear Copper ◽  
Temperature Dependent ◽  
Square Planar ◽  
Fitting Parameters

[Cu4(L)2(O2CMe)2] H2O (L = 1,3-bis(5-bromo-2-hydroxybenzylidene)propan-2-ol) was synthesized and its crystal structure determined. (C38H34N4O10Br4Cu4)·H2O, monoclinic, space group P21/c, a = 21.072(5), b = 9.673(2), c = 21.934(4) Å, β = 109.73(2)°, V = 4208(2) Å3, Z = 4. The crystal structure consists of two independent binuclear copper(II) complexes and the non-coordinating water molecule in the asymetric unit. The Cu(II) ions are in a square-planar geometry and coordinated by donor atoms of the ligand (NO3).The average Cu···Cu distance and average Cu-O-Cu angle are 3.491(2) Å and 132.0(1)°, respectively. Temperature-dependent magnetic susceptibility measurements of the complex show an intramolecular anti ferromagnetic coupling in the dimeric Cu(II) core. The fitting parameters are -2J = 174.4 cm-1, g = 1.98.

Structure and Magnetic Properties of a Dinuclear Copper(II) Complex

1997 ◽  
Vol 52 (2) ◽  
pp. 157-161 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalcin Elerman ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Monoclinic Space Group ◽  
Temperature Dependent ◽  
Space Group ◽  
Dinuclear Copper ◽  
Square Planar ◽  
Dinuclear Unit ◽  
Oxygen Atoms

Abstract [Cu2L] (L=N-2-hydroxy-4-methylphenyl-4-oxo-2-pentalketimine) was synthesized and its crystal structure determined. C24H26Cu2N2O4 monoclinic space group P21/n with a= 10.978(2), 17.045(3), c= 11.958(2) Å, β = 101.89(1)°, V = 2189.6(7) Å3,Z = 4. Two copper(II) atoms in a distorted square-planar coordination are bridged by two oxygen atoms to form a dinuclear unit. The copper(II) centers are separated by 3.025(1) Å and antiferromagnetically coupled (J =-222.3 cm-1 ), which follows from temperature-dependent magnetic susceptibility measurements in the range 4.2 to 300 K.

Structure and Magnetic Properties of a Dinuclear Complex with Iron(III) in Octahedral and Pyramidal Coordination

1994 ◽  
Vol 49 (9) ◽  
pp. 1239-1242 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalcin Elerman ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
Dinuclear Complex ◽  
Monoclinic Space Group ◽  
Temperature Dependent ◽  
Space Group ◽  
Binuclear Unit

[FeL(MeOH)Cl]2 (L = N-(2-hydroxyphenyl)salicylaldimine) was synthesized and its crystal structure determined, [C27H20N 2O5Cl2Fe2], monoclinic, space group P21/c, a = 9.528(1), b = 7.684(1), c = 18.365(2) Å, β = 109.83(1)°, V = 1264.8 Å3, Z = 2. Two identical [FeL(MeOH)Cl] fragments, related by an inversion centre, are combined by the two bridging O atoms, to form a binuclear unit. The iron(III) centers are separated by 3.163(2) Å and weakly antiferromagnetically coupled (J = -8 .0 (1 ) cm-1), which follows from temperature - dependent magnetic susceptibility measurements in the range 4.2 to 288 K. The effective magnetic moment per iron(III) is μeff = 7.4 μB at 288 K

X-Ray Structure and Magnetic Properties of the Tetracupferronato-bis(μ-methoxy)-diiron(III) Complex

1995 ◽  
Vol 50 (11) ◽  
pp. 1587-1590 ◽  
Author(s):  
Yalcin Elerman ◽  
Mehmet Kabak ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Exchange Interaction ◽  
Monoclinic Space Group ◽  
Antiferromagnetic Exchange ◽  
Temperature Dependent ◽  
Space Group ◽  
X Ray ◽  
Antiferromagnetic Exchange Interaction

The tetracupferronato-bis(μ-methoxy)-diiron(III) complex has been synthesized in acetonitrile and its crystal structure determined. C26H26N8O10Fe2, monoclinic, space group C2/c, a =18.425(3), b = 12.999(2), c = 15.046(3) Å, β = 124.66(2)°,V = 2964(1) Å3, Z = 4, wR(2) = 0.097 from 1491 reflections (F2). Two iron(III) atoms are at special positions in six-fold coordination, bridged by O with a Fe-O-Fe angle of 102.4(1)° and a distance between two iron(III) centers of 3.075(1) Å. Temperature-dependent magnetic susceptibility measurements reveal a antiferromagnetic exchange interaction (J = -14 cm-1) between the iron(III) centers.

Synthesis, Crystal Structure, and Spectroscopic and Magnetic Properties of a Dinuclear Iron(III) Complex Asymmetrically Bridged by a Phenoxo and a Methoxo Group

2005 ◽  
Vol 60 (9) ◽  
pp. 940-944 ◽  
Author(s):  
C. T. Zeyrek ◽  
A. Elmali ◽  
Y. Elerman
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Structural Parameters ◽  
Hamiltonian Operator ◽  
Antiferromagnetic Coupling ◽  
Iron Ions ◽  
Spin Hamiltonian ◽  
Dinuclear Iron ◽  
Super Exchange Interaction

A new dinuclear iron(III) derivative Fe2L(OCH3)Cl2 (L = 1,3-bis[N-(5-chloro-2-hydroxybenzylidene)- 2-aminoethyl]-2-(5-chloro-2-hydroxyphenyl)imidazolidine) has been synthesized, it crystal structure determined and magnetically characterized. The two iron(III) ions are asymmetrically bridged by a phenoxo and a methoxo group and separated by 3.150(2)Å . The magnetic susceptibility of the complex was measured over the range 5 - 349.3 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator , indicating very weak antiferromagnetic coupling between the iron ions with J = −11.3 cm−1. The magnetic and structural parameters of the compound and the nature of the magnetic super-exchange interaction are discussed and compared with data of similar dinuclear iron(III) complexes.

Structure and Magnetic Properties of a (μ-Oxo)diiron(III) Complex

1993 ◽  
Vol 48 (3) ◽  
pp. 313-317 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalcin Elerman ◽  
Ingrid Svoboda ◽  
Hartmut Fuess ◽  
Klaus Griesar ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Oxygen Atom ◽  
Monoclinic Space Group ◽  
Temperature Dependent ◽  
Space Group

μ-Oxo-bis[N ,N '-o-phenylene-di(salicylaldiminato)iron(III)] was synthesized in dioxane solvent and its crystal structure determined. [C2OH14N ,OiFe]-,O · (C4H8O2), monoclinic, space group P21/ c ,a = 14.650(2), b = 18.990(1), c = 13.296(1) Å, β = 76.080(7), V = 3590.3 Å3, Z = 4. Two iron (III) atoms in square pyramidal pentacoordination are bridged by an oxygen atom with an Fe - O - Fe angle of 145 and a Fe-Fe distance of 3.409(1) Å. The iron (III) centers are antiferrommagnetically coupled (J = -9 8 .5 cm-1), as derived from temperature-dependent magnetic susceptibility measurements in the range 4.2 to 286.5 K.

Magnetic Properties and Crystal Structure of a 3,5-Dimethylpyrazolate-Bridged Binuclear Copper(II) Complex

2001 ◽  
Vol 56 (10) ◽  
pp. 970-974 ◽  
Author(s):  
Y. Elerman ◽  
A. Elmali
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Dihedral Angle ◽  
Coordination Sphere ◽  
Magnetic Moment ◽  
Binuclear Copper ◽  
Temperature Dependent ◽  
Orthorhombic Space Group ◽  
Square Planar

[Cu2L(prz)] (prz = 3,5-dimethylpyrazole and L = 1,3-bis(5-bromo-2-hydroxybenzylidene)- propan-2-ol) was synthesized and its crystal structure determined. It crystallizes in the orthorhombic space group Pbca with a = 14.160(9), b = 15.109(4), c = 21.298(5) Å, V = 4557(1) A3, Z = 8 . Two copper(II) ions are in a square-planar coordination. The metal coordination sphere is four-coordinate, with a planar N2O2 donor set. The dihedral angle between the two coordination planes is 12.14(7)°. The copper(II) centers are separated by 3.365(1) Å and antiferromagnetically coupled (J = -214.3 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 125.9(1)° in the super-exchange pathway. The magnetic moment at 310 K is ca. 1.76 B.M. and 0.13 B.M. at 4.6 K.

Crystal Structure and Magnetic Properties of an Oxygen-Bridged Trinuclear Copper(II) Complex

2001 ◽  
Vol 56 (11) ◽  
pp. 1123-1128 ◽  
Author(s):  
Y. Elerman ◽  
E. Kavlakoglu ◽  
A. Elmali ◽  
E. Kendi
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Coordination Geometry ◽  
Asymmetric Unit ◽  
Temperature Dependent ◽  
Triclinic Space Group ◽  
Square Planar ◽  
Coordination Spheres ◽  
Characteristic Maximum ◽  
Super Exchange Interaction

[Cu3 (L)3].3(C1O4) (LH = l,3-diaminopropan-2-ol) was synthesized and its crystal structure determined. It crystallizes in the triclinic space group P1̅ with a = 10.504(2), b = 10.856(2), c = 12.519(2) Å, a = 74.41(1), ß = 70.60(1), γ = 63.60(1)°, V = 1193.6(3) Å3, Z = 2. The structure consists of trimeric [Cu3(L)3]+3 units and three perchlorate anions in the asymmetric unit. In the compound three copper(II) ions are linked by 1,3-diamino-2-propanol molecules in such a way that an almost equilateral triangle is formed. The coordination spheres of the three copper(II) ions are slightly different from each other. The coordination geometry of Cu1 is a distorted square pyramid, and that of Cu2 is almost square planar while that of Cu3 is tetrahedrally distorted square planar. The copper(II) centers are separated by average 3.481(2) Å and antiferromagnetically coupled (-J = 100 cm-1), which follows from temperature- dependent magnetic susceptibility measurements in the temperature range 4.4 to 299 K. The average Cu-O-Cu angle is 128.1(1)° in the super-exchange pathway. As the temperature is increased, the magnetic moment rises from 1.41 μB at 4.4 K to 2.22 μB at 299 K. In the X(T ) curve no characteristic maximum was observed. The magnetic super-exchange interaction for the title compound is due to the effective overlap of the magnetic orbitals (dx²-y²) with orbitals of bridging alkoxide oxygen atoms

Structure and Magnetic Properties of an Oxalic Acid Bridged Dinuclear Copper(II) Complex

1998 ◽  
Vol 53 (11) ◽  
pp. 1281-1284 ◽  
Author(s):  
Manas Kumar Saha ◽  
Sutapa Sen ◽  
Parimal Kundu ◽  
Tarakranjan Gupta ◽  
Volker Gramlich ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Oxalic Acid ◽  
Acid Molecule ◽  
Temperature Dependent ◽  
Triclinic Space Group ◽  
Space Group ◽  
Dinuclear Copper ◽  
Square Planar

[LCu{μ-(OH)2(C2O2)}CuL](ClO4)2, (HL = N,N-dimethyl N-propylsalicylald-imine) was synthesised and its crystal structure was determined. C26H36CI2Cu2N4O14, triclinic space group P1̅ with a = 9.288(9), b = 10.016(11), c = 10.09(2) Å and a = 101.05(11), β = 108.22(10), γ = 110.22(10)°, V = 787(2) Å3, Z = 2. Two copper(II) ions in a distorted square-planar coordination are bridged by an oxalic acid molecule to form dinuclear units. The copper(II) centres are separated by 5.2 Å and antiferromagnetically coupled (J = -478 cm-1), which follows from temperature-dependent magnetic susceptibility measurements in the range 12 to 300 K.

Magnetic Properties and Crystal Structure of a Dinuclear Iron(III) Complex

2001 ◽  
Vol 56 (9) ◽  
pp. 897-900 ◽  
Author(s):  
A. Elmali ◽  
Y. Elerman ◽  
I. Svoboda
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Liquid Helium ◽  
Magnetic Moment ◽  
Helium Temperature ◽  
Temperature Dependent ◽  
Triclinic Space Group ◽  
Dinuclear Iron ◽  
Binuclear Unit

Abstract [FeL(MeOH)Cl]2 (L = N-(5-methylphenyl)-3-methoxysalicylaldimine) was synthesized and its crystal structure determined, [C30H26Cl2Fe2N2O6], triclinic, space group P1̄, a = 7.481(2), b = 9.436(2), c = 10.961(2) Å, α= 69.790(10), β= 82.440(10), γ= 83.690(10)°, V=718.1(3) Å3 , Z = 1. Two identical [FeLCl] fragments, related by an inversion centre, are connected by two bridging O atoms to form a binuclear unit. The iron(III) centers are separated by 3.196(2) Å and weakly antiferromagnetically coupled (J = -10.4(1) cm-1), which follows from temperature-dependent magnetic susceptibility measurements in the range 5.1 to 275.6 K. The magnetic moment at 275.6 K is ca. 7.02 B. M., but 0.99 B. M. at 5.1 K. The magnetic susceptibility is at a maximum near 80 K and decreases rapidly as the temperature is lowered to liquid helium temperature.

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