ChemInform Abstract: Synthesis, X-Ray Structures, and Spectroscopic and Magnetic Properties of a Series of Isomeric Binuclear Molybdenum(III) Complexes of General Formula Mo2Cl6L3 (L: Thioether): Large Structural Influence of Bridging Ligands in Confacial

ChemInform ◽  
1990 ◽  
Vol 21 (31) ◽  
Author(s):  
K. J. MOYNIHAN ◽  
X. GAO ◽  
P. M. BOORMAN ◽  
J. F. FAIT ◽  
G. K. W. FREEMAN ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
General Formula ◽  
Bridging Ligands ◽  
X Ray ◽  
Structural Influence

scholarly journals “Lantern-Shaped” Platinum(III) Complexes with Axially Bound 9-Ethylguanine or 1-Methylcytosine (L) of General Formula[Pt2{HN=C(But)O}4L2](NO3)2

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Concetta Pacifico ◽  
Francesco Paolo Intini ◽  
Fiorentin Nushi ◽  
Giovanni Natile
Keyword(s):  
General Formula ◽  
Bridging Ligands ◽  
X Ray ◽  
X Ray Crystallography ◽  
Nmr Characterization

The synthesis, NMR characterization, and X-ray crystallography of “lantern-shaped” platinum(III) complexes with four pivaloamidate bridging ligands and two 9-ethylguanines (9-EtG) or 1-methylcytosines (1-MeC) in axial positions are reported:cis-N2O2-[Pt2{HN=C(But)O}4(9-EtG)2](NO3)2andcis-N2O2-[Pt2{HN=C(But)O}4(1-MeC)2](NO3)2. The last complex is, to the best of our knowledge, the first dinuclear compound of platinum(III) with axially bound 1-MeC.

scholarly journals New insights into the comprehension of the magnetic properties of dinuclear MnIII compounds with the general formula [{MnL(NN)}2(μ-O)(μ-n-RC6H4COO)2]X2

2016 ◽  
Vol 45 (29) ◽  
pp. 11753-11764 ◽  
Author(s):  
Luis Escriche-Tur ◽  
Mercè Font-Bardia ◽  
Belén Albela ◽  
Montserrat Corbella
Keyword(s):  
Magnetic Properties ◽  
General Formula ◽  
Structural Parameters ◽  
Magnetic Behaviour ◽  
Local Anisotropy ◽  
Bridging Ligands

The effect of the local anisotropy and the structural parameters, modulated by the benzoate bridging ligands, on the magnetic behaviour is reported.

Two Dinuclear CuII - Tetrazolate Complexes: Syntheses, Structures, and Magnetic Properties

2009 ◽  
Vol 62 (8) ◽  
pp. 941 ◽  
Author(s):  
Wei-Chao Song ◽  
Jian-Rong Li ◽  
E. Carolina Sañudo ◽  
Jia Liu ◽  
Xian-He Bu
Keyword(s):  
Magnetic Properties ◽  
Antiferromagnetic Coupling ◽  
Ferromagnetic Coupling ◽  
Single Crystal Diffraction ◽  
Bridging Ligands ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Van Vleck ◽  
Fitting Parameters ◽  
Weak Ferromagnetic

Two μ2-tetrazolyl bridged dinuclear CuII complexes, [Cu(L1)(N3)(phen)]2 1 (HL1 = 5-phenyltetrazole, phen = 1,10-phenanthroline) and [Cu(L2)2(NH3)2]2 2 (HL2 = 5-(2-methylphenyl)-1H-tetrazole), were synthesized and characterized by X-ray single crystal diffraction and IR spectroscopy. The two complexes are dinuclear CuII entities, in which the CuII centres are linked by tetrazolate bridging ligands. However, the CuII ions of the two complexes show different coordination geometries, square pyramidal for complex 1 and trigonal-bipyramidal for complex 2, which may lead to different magnetic properties. In complex 1, a weak ferromagnetic coupling was found to exist between CuII ions, but in complex 2, weak antiferromagnetic coupling was found to be present. A van Vleck equation for the CuII dimer was written using the Ĥ = –2J[Ŝ1Ŝ2] Hamiltonian, and it was used to fit the experimental data with fitting parameters J = 0.26 cm–1 and g = 2.17 for complex 1, J = –2.34 cm–1 and g = 2.17 for complex 2, respectively.

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

The Coordination Chemistry of Phosphoryl Compounds Containing the — N(CH3)2 Group, Part VIII

1972 ◽  
Vol 27 (7) ◽  
pp. 759-763 ◽  
Author(s):  
M. W. G. De Bolster ◽  
W. L. Groeneveld
Keyword(s):  
Coordination Chemistry ◽  
General Formula ◽  
Ligand Field ◽  
Chemical Analyses ◽  
X Ray ◽  
Physical Measurements ◽  
Ligand Field Spectra ◽  
Chloride Adduct ◽  
Ligand Field Parameters ◽  
Group Part

A number of new solvates and adducts containing bisphenyldimethylaminophosphine oxide is reported. The solvates have the general formula M[(C6H5)2P(O)N(CH3)2]42+(anion-)2, in which M = Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn and Cd, and the anions are ClO4- and BF4-. The adducts have the general formula M[(C6H5)2P(O)N(CH3)2]2Cl2, where M stands for the same series of metals.The compounds are characterized and identified by chemical analyses and physical measurements.Ligand-field and vibrational spectra have been investigated; values for the ligand-field parameters are reported. It is concluded that coordination takes place via the oxygen atom of the ligand.X-ray powder patterns were used in combination with ligand-field spectra to deduce the coordination around the metal ions.The interesting behaviour of the nickel (II) chloride adduct upon heating is discussed and it is shown that both a square pyramidal and a tetrahedral modification exists.

Molecular structures and magnetic properties of .mu.-phenolato binuclear copper(II) complexes incorporating chloro, hydroxo, and azido exogenous bridging ligands

1988 ◽  
Vol 27 (21) ◽  
pp. 3710-3716 ◽  
Author(s):  
Azdine Benzekri ◽  
Patrick Dubourdeaux ◽  
Jean Marc Latour ◽  
Jean Laugier ◽  
Paul Rey
Keyword(s):  
Magnetic Properties ◽  
Molecular Structures ◽  
Binuclear Copper ◽  
Bridging Ligands

Effect of Annealing temperature on the Structural and Magnetic Properties of TbxY3-xFe5O12(x = 0.0, 1.0, 2.0) Thin Films Prepared by Sol-Gel Process

2012 ◽  
Vol 501 ◽  
pp. 236-241 ◽  
Author(s):  
Ftema W. Aldbea ◽  
Noor Bahyah Ibrahim ◽  
Mustafa Hj. Abdullah ◽  
Ramadan E. Shaiboub
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Garnet Phase ◽  
Sol Gel Process ◽  
Amorphous Structures

Thin films nanoparticles TbxY3-xFe5O12 (x=0.0, 1.0, 2.0) were prepared by the sol-gel process followed by annealing process at various annealing temperatures of 700° C, 800° C and 900° C in air for 2 h. The results obtained from X-ray diffractometer (XRD) show that the films annealed below 900°C exhibit peaks of garnet mixed with small amounts of YFeO3 and Fe2O3. Pure garnet phase has been detected in the films annealed at 900°C. Before annealing the films show amorphous structures. The particles sizes measurement using the field emission scanning electron microscope (FE-SEM) showed that the particles sizes increased as the annealing temperature increased. The magnetic properties were measured at room temperature using the vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of the films also increased with the annealing temperature. However, different behavior of coercivity (Hc) has been observed as the annealing temperature was increased.

scholarly journals An investigation of polyhedral deformation in two mixed-metal diarsenates: SrZnAs2O7and BaCuAs2O7

2015 ◽  
Vol 71 (4) ◽  
pp. 330-337 ◽  
Author(s):  
Sabina Kovač ◽  
Ljiljana Karanović ◽  
Tamara Đorđević
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
General Formula ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Open Framework ◽  
Geometrical Characteristics ◽  
Barium Copper

Two isostructural diarsenates, SrZnAs2O7(strontium zinc diarsenate), (I), and BaCuAs2O7[barium copper(II) diarsenate], (II), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction. The three-dimensional open-framework crystal structure consists of corner-sharingM2O5(M2 = Zn or Cu) square pyramids and diarsenate (As2O7) groups. Each As2O7group shares its five corners with five differentM2O5square pyramids. The resulting framework delimits two types of tunnels aligned parallel to the [010] and [100] directions where the large divalent nine-coordinatedM1 (M1 = Sr or Ba) cations are located. The geometrical characteristics of theM1O9,M2O5and As2O7groups of known isostructural diarsenates, adopting the general formulaM1IIM2IIAs2O7(M1II= Sr, Ba, Pb;M2II= Mg, Co, Cu, Zn) and crystallizing in the space groupP21/n, are presented and discussed.

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