The crystal structure and low temperature magnetic susceptibility of square-planar bis(1,5-diazacyclooctane)nickel(II) perchlorate dihydrate

1986 ◽  
Vol 11 (4) ◽  
pp. 155-159 ◽  
Author(s):  
M. Sakhawat Hussain ◽  
Jamil Ahmad ◽  
Mazhar-ul-Haque ◽  
Gul Dad Khattak
Keyword(s):  
Crystal Structure ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Square Planar

MAGNETIC PROPERTIES OF R2In (R=Gd, Tb, Er)

1993 ◽  
Vol 07 (01n03) ◽  
pp. 818-821 ◽  
Author(s):  
D. RAVOT ◽  
O. GOROCHOV ◽  
T. ROISNEL ◽  
G. ANDRE ◽  
F. BOUREE-VIGNERON ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Low Temperature ◽  
Neutron Diffraction ◽  
Antiferromagnetic State ◽  
Powder Neutron Diffraction ◽  
Magnetic Transport ◽  
The Rare Earth

For all the Rare-Earth (R) the R2In form in the same crystal structure (P63/mmc). These compounds show a great variety of magnetic behaviors. When the temperature decreases, the magnetic susceptibility of Er2InTb2In and Gd2In increases, passes through a maximum then decreases. For Gd2In this behavior was associated with change from a paramagnetic to a ferromagnetic then to an antiferromagnetic state. We have performed magnetic, transport (Tb, Er), Mössbauer spectroscopy (Er) and powder neutron diffraction experiments (Gd, Tb, Er) on these compounds. Unlike Gd2In the resistivity of Tb2In and Er2In does not reveal any anomaly at the temperature where the susceptibility begins to decrease and the Tb2In and Er2In magnetizations show the same behavior at all temperatures in the ordered region. Neutron diffraction experiments reveal ferromagnetic and antiferromagnetic structures at low temperature.

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 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.

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.

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.

scholarly journals Synthesis and Crystal Structure of Alkynylplatinum(IV) Complex Containing the Terpyridine Ligand

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Tsugiko Takase ◽  
Dai Oyama
Keyword(s):  
Crystal Structure ◽  
Structural Analysis ◽  
Nitrogen Atom ◽  
Low Temperature ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Square Planar

Reaction of square planar [PtII(C≡CPh)(tpy)]+ (tpy = 2,2′:6′,2′′-terpyridine) with bromine at low temperature provides a general route for the synthesis of octahedral alkynyl(terpyridine)platinum(IV) complex. In this first example of alkynyl(terpyridine)platinum(IV) complex, the alkynyl group is situated in trans position relative to the central nitrogen atom of the terpyridine ligand, and the two bromido ligands are situated in trans positions; an X-ray structural analysis has been completed for trans(Br)-[PtIVBr2(C≡CPh)(tpy)]+.

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.

A Dimeric Mn(III) Complex of a Quadridentate Schiff Base Ligand. Synthesis, Structure and Ferromagnetic Exchange

2008 ◽  
Vol 63 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Hulya Kara Balikesir
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Low Temperature ◽  
Schiff Base Ligand ◽  
Dinuclear System ◽  
Ferromagnetic Exchange ◽  
Ligand Synthesis ◽  
Oxygen Atoms

The synthesis, crystal structure and magnetic properties of [Mn(III)L(H2O)]2(H2O)(ClO4) (1)(L = N,N'-bis(rac-5-chlorosalicylidenato)-1,2-diaminopropane) are reported. Compound 1 consists of a structurally dinuclear system in which two Mn ions are bridged by the oxygen atoms of μ-phenoxo ligands. Low temperature magnetic susceptibility measurements show a ferromagnetic intra-dimer interaction with J = +1.75 cm−1, g = 2.01 and α = −0.32.

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