Synthesis, Crystal Structure and Magnetic Properties of a Novel GdIII -CuII Heterodinuclear Complex

2000 ◽  
Vol 55 (12) ◽  
pp. 1131-1136 ◽  
Author(s):  
H. Kara ◽  
Y. Elerman ◽  
K. Prout
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Exchange Interaction ◽  
Spin Exchange ◽  
Copper Ion ◽  
Hamiltonian Operator ◽  
Axial Position ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Oxygen Atoms

Preparation, crystal structure and magnetic properties of a heterodinuclear complex, LCu(Me2CO)Gd(NO3)3 (L = (N,N′-bis(3-methoxysalicylidene)propane- 1,2-diamine) are reported. The crystal structure of the complex was determined by X-ray diffraction methods at 200 K. (C19H22N2O4 )Cu(C3H6O)Gd(NO3)3, monoclinic, space group P21/c, with a = 9.795(9), b = 18.763(3), c = 15.579(2) Å , β = 95.297(2) V = 2850.9(7) Å3 and Z= 4. The central region of the complex is occupied by Cu(II) and Gd(III) ions which are bridged by two phenolato oxygen atoms of the ligand. The copper ion adopts a square-based 4+1 coordination mode, the equatorial N2O2 donors being afforded by the ligand while the axial position is occupied by an oxygen atom of the acetone molecule. The Gd(III) ion is deca-coordinated. In addition to the two phenolate oxygen atoms, the coordination sphere contains two oxygen atoms of the OMe side arms of L and six oxygen atoms from the three bidentate nitrate ions. The Gd... Cu separation is 3.425(3) Å and the dihedral angle between the GdO(l)Cu and GdO(2)Cu planes is 164.8°. The magnetic susceptibility of the complex was measured over the range 5 - 350 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator (H = -JSCu · SGd), giving the exchange integral J(Cu-Gd) = 5.6(1) cm-1. This indicates a weak ferromagnetic spin exchange interaction. The nature of the magnetic super-exchange interaction of the title compound is compared with similar [Gd(III)-Cu(II)] heterodinuclear complexes.

Crystal Structure and Magnetic Properties of a CeIII –CuII Heterodinuclear Complex

2003 ◽  
Vol 58 (7) ◽  
pp. 639-643 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalçin Elerman
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Copper Ion ◽  
Magnetic Interaction ◽  
Axial Position ◽  
Monoclinic Space Group ◽  
Paramagnetic Centers ◽  
Acetone Molecule ◽  
Crystal Field Effect ◽  
Oxygen Atoms

Crystal structure and magnetic properties of a heterodinuclear complex, LCu(Me2CO)Ce(NO3)O3 (L = (N,N’-propylene-bis(3-methoxysalicylideneimine)) are reported. (C19H22N2O4)Cu(C3H6O) Ce(NO3)3, monoclinic, space group P21/c, with a = 9.8295(4), b = 19.049(3), c = 15.668(3) Å , β = 94.873(12)◦, V = 2923.2(7) Å3, Z = 4. The central region of the complex is occupied by CuII and CeIII ions which are bridged by two phenolato oxygen atoms of the ligand. The copper ion adopts a square-based 4+1 coordination made, the equatorial N2O2 donors being afforded by the ligand while the axial position is occupied by an oxygen atom of the acetone molecule. The CeIII ion is deca-coordinated. In addition to the two phenolate oxygen atoms, the coordination sphere contains two oxygen atoms of the OMe side arms of L and six oxygen atoms from the three bidentate nitrate ions. The Ce···Cu separation is 3.601(2) Å and the dihedral angle between the CeO(2)Cu and CeO(3)Cu planes is 17.4(1)°. The magnetic susceptibility of the complex was measured over the range 5 - 350 K. The magnetic properties of the investigated compound are dominated by the crystal field effect on the CeIII site, masking the magnetic interaction between the paramagnetic centers.

Crystal Structure and Magnetic Properties of a Novel CuIINdIII Heterodinuclear Schiff Base Complex

2004 ◽  
Vol 59 (5) ◽  
pp. 530-534 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalçın Elerman
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Copper Ion ◽  
Schiff Base Complex ◽  
Magnetic Interaction ◽  
Axial Position ◽  
Monoclinic Space Group ◽  
Molar Magnetic Susceptibility ◽  
Crystal Field Effect ◽  
Oxygen Atoms

Abstract The crystal structure of L’Cu(Me2CO)Nd(NO3)3 (L’ = N,N’-bis(2-hydroxy-3-methoxybenzylidene)- ethylenediamine) was determined and the magnetic properties of the complex were investigated. (C18H18N2O4)Cu(C3H6O)Nd(NO3)3, monoclinic, space group P21/c, with a = 9.8792(9), b = 18.904(4), c = 15.667(2) Å , β = 95.360(10)°, V = 2913.1(8) Å3, Z = 4. The central region of the complex is occupied by CuII and NdIII ions which are bridged by two phenolato oxygen atoms of the ligand. The copper ion adopts a square-based 4+1 coordination made, the basal N2O2 donors being afforded by the ligand while the axial position is occupied by the oxygen atom of the acetone molecule. The NdIII ion is deca-coordinated. In addition to the two phenolate oxygen atoms, the coordination sphere contains two oxygen atoms of the OMe side arms of L and six oxygen atoms from the three bidentate nitrate ions. The Cu···Nd separation is 3.466(2) Å . The χT versus T plots, χ being the molar magnetic susceptibility per CuIINdIII unit and T the temperature, has been measured in the 4.5 - 299.6 K temperature range. The magnetic properties of the investigated compound are dominated by the crystal field effect on the NdIII site, masking the magnetic interaction between the paramagnetic centers.

Magnetic Properties and Crystal Structure of a CuIIGdIII Heterodinuclear Schiff Base Complex

2004 ◽  
Vol 59 (5) ◽  
pp. 535-540 ◽  
Author(s):  
Ayhan Elmali ◽  
Yalçın Elerman
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Exchange Interaction ◽  
Spin Exchange ◽  
Schiff Base Complex ◽  
Magnetic Data ◽  
Planar Geometry ◽  
Triclinic Space Group ◽  
Square Planar ◽  
Oxygen Atoms

Abstract The crystal structure and the magnetic properties of a heterodinuclear complex, [LCu(Me2CO)Gd(NO3)3]2 (L=N,N’-bis(2-hydroxy-3-methoxybenzylidene)-1,3-diaminopropane) are reported: [(C19H20N2O4)Cu(C3H6O)Gd(NO3)3]2, triclinic, space group P1, with a = 12.118.3(9), b = 13.562(3), c = 9.391(3) Å , α = 93.03(3), β = 107.65(2), γ = 73.07(2)°, V = 1406.0(7) Å3, Z = 1. The crystal structure consists of two independent binuclear CuIIGdIII complexes and two non-coordinating acetone molecules in the asymmetric unit. The central region of the complexs is occupied by CuII and GdIII ions which are bridged by two phenolato oxygen atoms of the ligand. The CuII ion is in a square-planar geometry and coordinated by four donor atoms of the ligand (N2O2). The GdIII ion is deca-coordinated. In addition to the two phenolate oxygen atoms, its coordination sphere contains two oxygen atoms of the OMe side arms of L and six oxygen atoms from the three bidentate nitrate ions. The average Cu···Gd separation is 3.375(2) Å . The χT versus T plots, χ being the molar magnetic susceptibility per CuIIGdIII unit and T the temperature, has been measured in the 4 - 347 K range. The values of the intrachain interaction parameters have been deduced from the magnetic data: J = 7.4 cm−1, gCu = 2.12, gGd = 2.06. This indicates a weak ferromagnetic spin exchange interaction between CuII and GdIII ions. The nature of the magnetic super-exchange interaction of the title compound is compared with similar CuIIGdIII heterodinuclear complexes.

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 and Crystal Structure of a Caesium Hydrogen Benzoylcyanoximate Complex with 18-Crown-6: Cs(18-Crown-6){H(L)2}

1997 ◽  
Vol 52 (8) ◽  
pp. 901-905 ◽  
Author(s):  
Vera V Ponomareva ◽  
Victor V Skopenko ◽  
Konstantin V Domasevitch ◽  
Joachim Sieler ◽  
Thomas Gelbrich
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Crown Ether ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
The Mean ◽  
Cyano Groups ◽  
Oxygen Atoms

Abstract The caesium hydrogen benzoylcyanoximate (L-) complex with 18-crown-6 of composition Cs(18-crown-6){H(L)2} has been prepared and studied by means of X-ray diffraction [monoclinic, space group P21/n, with a = 9.906(1), b = 18.387(3), c = 18.855(3)Å, β = 90.13(1)°, V = 3434.3(9) Å, Z = 4; final R1 = 0.043 for the 6431 independent reflections used. The lattice consists of Cs(18-crown-6)+ cations and complex hydrogen oximate anions {H(L)2}-, formed via strong hydrogen bonding between the oxygen atoms of nitroso-groups [O - - - O ca. 2.456(5)Å]. The caesium atom deviates by 1.492(3) Å from the mean plane of the oxygen atoms of the macrocyclic ether (dominant orientation of disordered ligand, 60%) and adopts a typical “sunrise coordination” [Cs-O (ether) 3.040(9)-3.312(7) Å]. The hydrogen oximate groups are bonded to the metal center only on one side of the crown ether plane via the oxygen atoms of nitroso-groups and the nitrogen atoms of cyano groups (Cs-O ca. 3.040(9), 3.312(7) Å; Cs-N ca. 3.469(5), 3.679(6) Å). The coordination polyhedron of Cs+ can be described as a distorted bicapped tetragonal prism.

Exchange Interaction in a Dinuclear Iron(III) Complex of a Heptadentate Schiff Base: Synthesis, Crystal Structure and Magnetic Properties

2005 ◽  
Vol 60 (7) ◽  
pp. 727-731 ◽  
Author(s):  
C. T. Zeyrek ◽  
A. Elmali ◽  
Y. Elerman
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Exchange Interaction ◽  
Hamiltonian Operator ◽  
Antiferromagnetic Coupling ◽  
Iron Ions ◽  
Spin Hamiltonian ◽  
Dinuclear Iron

Synthesis, crystallographic characterization and magnetic properties of the new dinuclear iron(III) complex Fe2L(OCH3)Cl2 (L=1,3-bis[N-(3,5-dichloro-2-hydroxybenzylidene)-2-aminoethyl]-2-(3,5- dichlo ro-2-hydroxyphenyl)imidazolidine) are reported. The structure consists of dinuclear units. The two iron(III) atoms are asymmetrically bridged by a phenoxo and a methoxo group. The iron(III) centers are separated by 3.133(2) Å . The Magnetic susceptibility of the complex was measured over the range 5 - 298 K and the observed data were successfully simulated by the equation based on the spin-Hamiltonian operator H = −JS⃗1.S⃗2. Magnetic susceptibility measurements indicate very weak antiferromagnetic coupling between the iron ions with J = −10.8 cm−1 and g = 2.0.

Crystal structure and solution studies of the product of the reaction of β-mercaptoethanol with vanadate

1999 ◽  
Vol 77 (12) ◽  
pp. 2088-2094 ◽  
Author(s):  
Sudeep Bhattacharyya ◽  
Raymond J Batchelor ◽  
Frederick WB Einstein ◽  
Alan S Tracey
Keyword(s):  
Crystal Structure ◽  
Mixed Solvent ◽  
Axial Position ◽  
Acetonitrile Solution ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Solution Studies ◽  
Alkaline Conditions

Reaction of β-mercaptoethanol with vanadate under slightly alkaline conditions provided a crystalline complex that was characterized by X-ray diffraction and FTIR spectroscopy. The complex was dimeric in structure with a central [VO]2 core and a pentacoordinate, crudely trigonal bipyramidal arrangement about each vanadium atom with a sulphur occupying a pseudo-axial position. A single 51V NMR signal was observed for this complex when dissolved in water, chloroform or acetonitrile. A large influence of acetonitrile on the vanadium chemical shift suggested the possibility of reaction with acetonitrile. FTIR showed the presence of two complexes in acetonitrile solution but only one in chloroform or water. Mixed solvent studies were carried out in an effort to further characterize the solution complexes. Crystal structure of [{VO2(OC2H4S)}2][NEt4]2: monoclinic, space group P21/n,. a = 8.3451(17), b = 16.954(4), c = 10. 2064(25) Å; β = 101. 271(18)°; V = 1416.2 Å3; Z = 2; RF = 0.048 for 1355 data (Io 2..5σ (Io) and 147 variables.Key words: mercaptoethanol, vanadate, vanadium NMR, X-ray diffraction, FTIR, thiolate.

Crystal Structure and Magnetic Properties of a New Hetero-Dinuclear CuIIMnII Schiff Base Complex

2003 ◽  
Vol 58 (4) ◽  
pp. 271-277 ◽  
Author(s):  
Y. Elerman ◽  
A. Elmali ◽  
C. T. Zeyrek ◽  
I. Svoboda ◽  
H. Fuess
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Schiff Base ◽  
Schiff Base Complex ◽  
Antiferromagnetic Interaction ◽  
Monoclinic Space Group ◽  
Distorted Tetrahedron ◽  
Molar Magnetic Susceptibility ◽  
Schiff Base Ligands ◽  
Oxygen Atoms

Mn[Cu(L)(O2CMe)2] · H2O (L = N,N’-bis(2-hydroxy-3-methoxybenzylidene)-1,3-diaminopropane) was synthesized and the crystal structure determined. (C23H26CuMnN2O8).H2O, monoclinic, space group P21/c, a = 12.017(3), b = 8.217(3), c = 24.786(4) Å , β = 92.10(2)°, V = 2446(1) Å3, Z = 4. The crystal structure consists of ordered dinuclear units with CuII and MnII ions bridged by two oxygen atoms of the Schiff base ligand. The CuII coordination sphere is a slightly distorted square-plane formed by the N2O2 donor set of the Schiff base ligands. The average Cu-O and Cu-N distances are 1.920(1) and 1.957(4) Å , respectively. The coordination around the MnII ion is a distorted tetrahedron with the donor oxygen atoms of the Schiff base ligands and oxygen atoms of the acetate anions. The Cu ··· Mn separation is 3.327(4) Å . There is also one non-coordinating water molecule in the crystal structure. The χ and χT versus T plots, χ being the molar magnetic susceptibility per CuIIMnII unit and T the temperature, has been measured in the 4.9 - 301 K temperature range. The values of the interaction parameters are J = −28.3 cm−1, gMn = 2.01, gCu = 2.07. This indicates an intramolecular antiferromagnetic interaction between CuII and MnII ions.

The guanidinium t-diaqua-bis(oxalato)chromate(III) dihydrate complex: synthesis, crystal structure, EPR spectroscopy and magnetic properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Idelle Nono Kamga ◽  
Augustin Nkwento Nana ◽  
Bridget Ndoye Ndosiri ◽  
Frédéric Capet ◽  
Michel Foulon ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
Dimensional Network ◽  
Ft Ir ◽  
Water Ligands ◽  
Electron Paramagnetic ◽  
Oxygen Atoms

Abstract A new salt (CH6N3)[t-Cr(C2O4)2(H2O)2]·2H2O (1) (CH6N3 + = guanidinium cation) has been synthesized and characterized by single-crystal X-ray diffraction, FT-IR and UV–Vis spectroscopies, elemental and thermogravimetric analyses. In the crystal structure of 1, the chromate(III) ion lies on an inversion center in the form of an elongated octahedron. The coordination sphere consists of four oxygen atoms of two chelating oxalato ligands in the equatorial plane and two axial oxygen atoms of water ligands. The structural feature of focal interest in the structure of 1 is the formation of pillars of [Cr(C2O4)2(H2O)2]− complex anions and CH6N3 + guanidinium cations, with the next-neighbor cations rotated by an angle of 60° relative to each other. O–H···O and N–H···O hydrogen bonds play an important role in the construction of the three-dimensional network. The electron paramagnetic resonance (EPR) and magnetic properties of 1 have also been investigated.

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.

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