Some substituted urea and thiourea complexes of Co(II), Mn(II), and Cr(III)

1969 ◽  
Vol 47 (12) ◽  
pp. 2275-2282 ◽  
Author(s):  
Pakinam Askalani ◽  
R. A. Bailey
Keyword(s):  
Magnetic Susceptibility ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Ligand Field Parameters ◽  
Substituted Urea

Complexes of Co(II), Mn(II), and Cr(III) with N-butylurea, N-methylthiourea, and N,N′-dimethylthiourea, and Cl−, Br−, NO3−, and ClO4− anions were prepared and characterized using infrared and visible spectroscopy, and magnetic susceptibility. The urea is bonded through oxygen, and the thioureas through sulfur in all cases. The Co–N-butylurea compounds are octahedral, mostly with CoL6X2 stoichiometries, but some compounds involving coordinated anions and possibly bridging butylurea ligands were found. The Co–thioureas are tetrahedral. Octahedral Cr(III) compounds of the type CrL3X3 and CrL6(ClO4)3 were prepared, and the CrS6 chromophore characterized. Mn(II)–butylureas are octahedral, while the thioureas show MnL6X2 and MnL4X2 stoichiometries. X-ray diffraction established some of the latter to be isostructural with the analogous tetrahedral Co(II) compounds. Ligand field parameters Dq and B have been evaluated for the Co(II) and Cr(III) compounds.

Etude des Succinates Simples et Complexes de Cobalt(II)

1975 ◽  
Vol 53 (1) ◽  
pp. 98-105 ◽  
Author(s):  
Patrick Sharrock ◽  
Théophile Theophanides
Keyword(s):  
Magnetic Susceptibility ◽  
Succinic Acid ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
First Time

Cobalt(II) succinate tétrahydraté, CoC4H4O·4H2O and anhydrous (amorphous and crystalline) have been prepared and studied by i.r. and u.v.–visible spectroscopy, magnetic susceptibility, thermogravimetry, and by X-ray diffraction. The alkaline salts of cobalt succinate M2Co2(C4H4O4)3, where M = K+ and NH4+ have also been prepared for the first time. The staggered gauche and trans conformations of succinic acid have been found to be present in the complexes. The cage-like structure has not been found in any of the Co(II) carboxylates studied here.

Polyamine ligands. III. Five-coordinate complexes with the quinquedentate N,N,N'-Tris[2-(2'-pyridyl)ethylethylenediamine

1971 ◽  
Vol 24 (3) ◽  
pp. 501 ◽  
Author(s):  
AT Phillip ◽  
W Mazurek ◽  
AT Casey
Keyword(s):  
Magnetic Susceptibility ◽  
Diffraction Analysis ◽  
Electronic Absorption ◽  
Metal Ion ◽  
Electronic Absorption Spectra ◽  
Ligand Field ◽  
Field Calculation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Free Amine

The quinquedentate ligand, N,N,N?-tris[2-(2?- pyridyl)ethyl]ethylenediamine (tpen), has been synthesized from ethylenediamine and 2-vinylpyridine. The free amine tpen is thermally unstable, but readily forms chemically stable metal complexes of the composition [M(tpen)](ClO4)2 (M = Cu, Ni, Zn) and [Co(tpen)O2Co(tpen)]- (ClO4)4. In each of these compounds, the amine tpen is bonded to the metal ion through all five of its nitrogen atoms, as indicated by infrared and electronic absorption spectra and magnetic susceptibility measurements. The compound [Ni(tpen)](ClO4)2 shows four d-d transitions whose energies correspond closely to the values predicted from a ligand field calculation for a square pyramidal NiN5 chromophore. This structure has been confirmed by X-ray diffraction analysis. These complexes of tpen are the first reported quinquedentate pentaamine chelate structures of copper(II), nickel(II), and zinc(II).

Synthesis, Spectroscopy and Structure of the Cobalt(III) Complex of the Hexadentate Ligand 5-(4-Amino-2-thiabutyl)-5-methyl-3,7-dithianonane-1,9-diamine

1993 ◽  
Vol 46 (11) ◽  
pp. 1799 ◽  
Author(s):  
TM Donlevy ◽  
LR Gahan ◽  
TW Hambley ◽  
KL Mcmahon ◽  
R Stranger
Keyword(s):  
Crystal Structure ◽  
Progressive Increase ◽  
Ligand Field ◽  
Octahedral Symmetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexadentate Ligand ◽  
Symmetry Result ◽  
Ligand Field Parameters ◽  
Systematic Reduction

A revised synthesis of the hexadentate ligand 5-(4-amino-2-thiabutyl)-5-methyl-3,7-dithianon- ane-1,9-diamine (N3S3) is reported. Reaction between the sodium salt of 2-aminoethanethiol and 1,1,1-tris([( tolylsulfonyl )oxy]methyl)ethane in refluxing ethanol results in the formation of the hexadentate ligand N3S3. The preparation of the nickel(II) and cobalt(III) complexes is reported. The crystal structure of [Co(N3S3)](ClO4)3.H2O has been determined by X-ray diffraction methods and refined to a residual of 0.044 for 3696 independent observed reflections. The crystals are monoclinic, P21/n, a 9.314(4), b 15.581(6), c 17.026(3) Ǻ, β 90.30(4)°. Low temperature (c.10 K) absorption spectra are reported for [Co(N3S3)]3+ and the analogous encapsulated complex [Co(AMN3S3sarH)]4+ where both the spin-allowed 1A1g → 1T1g, 1T2g and spin-forbidden 1A1g → 3T1g, 3T2g were observed. Ligand -field calculations based on octahedral symmetry result in the ligand -field parameters B 461, C 3075, Dq 2303 cm-1, and B 462, C 3085, Dq 2266 cm-1 for the [Co(N3S3)]3+ and [Co(AMN3S3sarH)]4+ complexes, respectively. A systematic reduction occurs in the Racah B parameter of between 25 and 30 cm-1 for each additional thioether donor in the series of complexes N6-xSx (x = 0, 1, 2, 3). In addition, there is evidence for a progressive increase in the Racah C/B ratio with increasing number of thioether donors in this series.

Studies of β-Diketone Complexes of Rhenium. I. Trispentane-2,4-dionatorhenium(III) and Tris(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)rhenium(III)

1972 ◽  
Vol 50 (1) ◽  
pp. 8-17 ◽  
Author(s):  
W. D. Courrier ◽  
W. Forster ◽  
C. J. L. Lock ◽  
G. Turner
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Magnetic Susceptibility ◽  
Infrared Spectroscopy ◽  
Physical Properties ◽  
Ligand Field ◽  
X Ray Diffraction ◽  
Rhenium Atom ◽  
X Ray ◽  
Monoclinic Cell

Pure samples2 of Re(hfac)3 and Re(acac)3 have been prepared and their physical properties studied by ultraviolet–visible and infrared spectroscopy, mass spectrometry, magnetic susceptibility measurements, and X-ray diffraction. The compounds are monomeric and the physical properties may be explained if the rhenium atom sits in an essentially octahedral ligand field. Re(hfac)3 has a hexagonal unit cell and the acetyl-acetone complex adopts the monoclinic cell of the α-form of the three typical crystal structure types which Astbury (1) observed for trispentane-2,4-dionatometal(III) compounds. The properties observed for trispentane-2,4-dionatorhenium(III) differ from those reported previously (2, 3). The difficulties experienced in obtaining pure Re(C5H7O2)3 were caused by the ease with which the material is oxidized.

Donor properties of 2-aminothiazole and 2-acetylaminothiazole towards cobalt(II) halides

1974 ◽  
Vol 27 (3) ◽  
pp. 509 ◽  
Author(s):  
PP Singh ◽  
AK Srivastava
Keyword(s):  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Point Group ◽  
Carbonyl Oxygen ◽  
Ligand Field ◽  
Tetrahedral Configuration ◽  
X Ray ◽  
Ligand Field Parameters

Molecular addition complexes of the type CoL2X2 (X = Cl, Br, I and L = 2-aminothiazole and 2-acetylaminothiazole) have been prepared and studied by infrared spectra, electronic spectra, magnetic susceptibility and X-ray powder data. Infrared and electronic spectra suggest coordination through exocyclic nitrogen in 2-aminothiazole and through carbonyl oxygen in 2-acetylaminothiazole. The complexes have tetrahedral configuration and belong to the C2" point group. Ligand field parameters Dq, B' and β show more covalency in 2-aminothiazole complexes than in 2-acetylamino-thiazole complexes and suggest a weak ligand field for both the ligands.

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.

Ternary Antimonides RE4T7Sb6 (RE=Gd–Lu; T =Ru, Rh) with Cubic U4Re7Si6-type Structure

2013 ◽  
Vol 68 (9) ◽  
pp. 971-978 ◽  
Author(s):  
Inga Schellenberg ◽  
Ute Ch. Rodewald ◽  
Christian Schwickert ◽  
Matthias Eul ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Susceptibility ◽  
Single Crystal ◽  
Magnetic Moment ◽  
Induction Furnace ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Antiferromagnetic Ordering ◽  
Arc Melting ◽  
Intermediate Valent

The ternary antimonides RE4T7Sb6 (RE=Gd-Lu; T =Ru, Rh) have been synthesized from the elements by arc-melting and subsequent annealing in an induction furnace. The samples have been characterized by powder X-ray diffraction. Four structures were refined on the basis of single-crystal X-ray diffractometer data: U4Re7Si6 type, space group Im3m with a=862.9(2) pm, wR2=0.0296, 163 F2 values for Er4Ru7Sb6; a=864.1(1) pm, wR2=0.1423, 153 F2 values for Yb4Ru7Sb6; a=872.0(2) pm, wR2=0.0427, 172 F2 values for Tb4Rh7Sb6; and a=868.0(2) pm, wR2=0.0529, 154 F2 values for Er4Rh7Sb6, with 10 variables per refinement. The structures have T1@Sb6 octahedra and slightly distorted RE@T26Sb6 cuboctahedra as building units. The distorted cuboctahedra are condensed via all trapezoidal faces, and this network leaves octahedral voids for the T1 atoms. The ruthenium-based series of compounds was studied by temperature-dependent magnetic susceptibility measurements. Lu4Ru7Sb6 is Pauli-paramagnetic. The antimonides RE4Ru7Sb6 with RE=Dy, Ho, Er, and Tm show Curie-Weiss paramagnetism. Antiferromagnetic ordering occurs at 10.0(5), 5.1(5) and 4.0(5) K for Dy4Ru7Sb6, Ho4Ru7Sb6 and Er4Ru7Sb6, respectively, while Tm4Ru7Sb6 remains paramagnetic. Yb4Ru7Sb6 is an intermediate-valent compound with a reduced magnetic moment of 3.71(1) μB per Yb as compared to 4.54 μB for a free Yb3+ ion

X-ray diffraction study, magnetic susceptibility, and electric properties of Cu3Fe0.5Se2 crystal

2010 ◽  
Vol 55 (4) ◽  
pp. 673-675
Author(s):  
G. G. Guseinov ◽  
S. S. Ragimov ◽  
J. Hasani Barbaran ◽  
G. M. Agamirzoeva
Keyword(s):  
Magnetic Susceptibility ◽  
Diffraction Study ◽  
Electric Properties ◽  
X Ray Diffraction ◽  
X Ray

Etude de l'effet des cations alcalins sur la structure du succinate de cuivre

1974 ◽  
Vol 52 (3) ◽  
pp. 418-425 ◽  
Author(s):  
P. Sharrock ◽  
T. Theophanides
Keyword(s):  
Magnetic Susceptibility ◽  
General Formula ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Complex Salts

New complex-salts of copper of the general formula M2Cu(succinate)2.xH2O, where M = Li, Na, K, and NH4; 0 ≤ x ≤ 51/2 were synthesized. The complexes were studied by infrared and visible spectroscopy, thermogravimetry, X-ray powder patterns, and magnetic susceptibility measurements.

TIN ADDITION TO THE (Bi, Pb) 2223 SYSTEM

1994 ◽  
Vol 08 (19) ◽  
pp. 1175-1183 ◽  
Author(s):  
G. RAVI CHANDRA ◽  
B. GOPALA KRISHNA ◽  
S. V. SURYANARAYANA ◽  
T. S. N. MURTHY
Keyword(s):  
Heat Treatment ◽  
Magnetic Susceptibility ◽  
Electrical Resistance ◽  
Volume Fraction ◽  
Ac Magnetic Susceptibility ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Metallic Behavior ◽  
X Ray

The effect of the addition of Sn on the superconducting properties of the Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y system as functions of Sn concentration and heat treatment has been studied by dc electrical resistance, ac magnetic susceptibility, and X-ray diffraction. Tin addition suppresses the volume fraction of the high T c phase. Samples with Sn > 0.1 show metallic behavior up to LNT. The formation of the Ca 2 PbO 4 phase is promoted by Sn. This depletes the amount of Pb and Ca necessary for the formation of the 2223 phase, thus reducing the volume fraction of the 2223 phase. It is possible that at least a small fraction of tin substitutes some of the cationic sites of the starting composition. The results of the different measurements are presented.

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