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.

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.

Synthesis of [Cu2(Me2[9]aneN2S)2(OH)2](PF6)2, a Hydroxo-Bridged Copper(II) Complex of N,N′-Dimethyl-1-thia-4,7-diazacyclononane (Me2[9]aneN2S). X-Ray Structural Analysis, Magnetic Susceptibility, E.P.R. and Visible Spectroscopy

1999 ◽  
Vol 52 (9) ◽  
pp. 861 ◽  
Author(s):  
Vincent A. Grillo ◽  
Trevor W. Hambley ◽  
Lawrence R. Gahan ◽  
Graeme R. Hanson ◽  
Robert Stranger ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Charge Transfer Band ◽  
Hydroxo Complex ◽  
Ferromagnetic Coupling ◽  
Visible Spectroscopy ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
X Ray Crystallography ◽  
Susceptibility Study ◽  
Fitting Parameters

The bis(µ-hydroxo) complex [Cu 2 (Me 2 [9]aneN 2 S) 2 (OH) 2 ] (PF 6 ) 2 (Me 2 [9]aneN 2 S = N,N′-dimethyl-1-thia-4,7- diazacyclononane) results after reaction of [Cu(Me 2 [9]aneN 2 S)(MeCN)] (PF 6 ) with dioxygen at −78°C in acetonitrile. The complex has been characterized by X-ray crystallography: orthorhombic, space group Pnma, with a 18.710(3), b 16.758(2), c 9.593(2) Å, and Z = 4. The structure refined to a final R value of 0.051. The complex contains two copper(II) ions bridged by two hydroxo groups with Cu···Cu 2.866(1) Å. The solid-state magnetic susceptibility study reveals ferromagnetic coupling, the fitting parameters being J = +46±5 cm −1 , g = 2.01±0.01 and ? = −0.58±0.03 K. The frozen-solution e.p.r. spectrum in dimethyl sulfoxide is characteristic of a monomeric copper(II) ion (g ‖ 2.300, g ⊥ 2.063; A ‖156.2 × 10 −4 cm −1 , A ⊥ 9.0 × 10 −4 cm −1 ) with an N 2 O 2 donor set. Thioether coordination to the copper(II) in solution is supported by the presence of an intense absorption assigned to a σ(S)→Cu II LMCT transition at c. 34000 cm −1 . The single-crystal spectrum of [Cu 2 (Me 2 [9]aneN 2 S) 2 (OH) 2 ] (PF 6 ) 2 (273 K) reveals d→d transitions at 14500 and 18300 cm −1 and a weak π(S)→Cu II charge-transfer band at approximately 25000 cm −1.

scholarly journals New Low-Melting Triply Charged Homoleptic Cr(III)-Based Ionic Liquids in Comparison to Their Singly Charged Heteroleptic Analogues

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2676
Author(s):  
Tim Peppel ◽  
Martin Köckerling
Keyword(s):  
Ionic Liquids ◽  
General Formula ◽  
Methyl Ethyl ◽  
Melting Points ◽  
X Ray ◽  
Imidazolium Cations ◽  
Thermal Investigations ◽  
Anions And Cations ◽  
Complex Salts ◽  
Singly Charged

A series of new low-melting triply charged homoleptic Cr(III)-based ionic liquids of the general formula (RMIm)3[Cr(NCS)6] (R = methyl, ethyl, n-butyl, benzyl) is reported. Their syntheses and properties are described in comparison to their singly charged heteroleptic analogues of the general formula (RMIm)[Cr(NCS)4L2] (R = methyl, ethyl, n-butyl, benzyl; L = pyridine, γ-picoline). In total, sixteen new Reineckate related salts with large imidazolium cations are described. Out of these, five compounds were crystallized, and their structures determined by single-crystal X-ray structure analyses. They all consisted of discrete anions and cations with octahedrally coordinated Cr(III) ions. In the structures, various hydrogen contacts interconnect the entities to build up hydrogen bonded networks. Thermal investigations showed relatively low melting points for the homoleptic complexes. The compounds with the [Cr(NCS)6]3− anion melt without decomposition and are stable up to 200 K above their melting points. The complex salts with the [Cr(NCS)4L2]− anion, in contrast, start to decompose and lose L molecules (Pyr or Pic) already at the melting point.

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.

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.

Biocompatibility of Silver Nano Bio-conjugates from Vitis vinifera Seeds and its Major Component Resveratrol

2016 ◽  
Vol 6 (3) ◽  
Author(s):  
R. Preethi ◽  
P. Padma
Keyword(s):  
Zeta Potential ◽  
Vitis Vinifera ◽  
Silver Ions ◽  
Seed Extract ◽  
Polydispersity Index ◽  
Potential Range ◽  
Visible Spectroscopy ◽  
Grape Seeds ◽  
X Ray ◽  
Uv Visible

The study focused on the green synthesis of silver nanobioconjugates (AgNPs) from phenolic-rich fruit source, Vitis vinifera seed extract and its major component phenolic, resveratrol respectively. Sunlight exposure for 20 minutes was the method of choice for the synthesis of AgNPs of the extract as well as the phenolic, resveratrol. The synthesized nanobioconjugates were characterized using UV-Visible spectroscopy, Transmission electron microscopy (TEM), Energy dispersive X-ray analysis (EDAX), X-ray diffraction (XRD), Polydispersity index, Zeta potential and Fourier transform infrared spectroscopy (FTIR). The reduction of silver ions was confirmed by UV-visible spectroscopy with peaks at 440nm for both nanobioconjugates synthesized from seed extract and compound. The nanobioconjugates showed the spherical in shape with 14-35nm in size and crystalline in nature. The conjugates are well dispersed with 0.301 and 0.287 polydispersity index and the zeta potential range at -13.6 and -14.3mV for stability. The FTRI data proved that the components in grape seeds act as good reductants and stabilizers for the silver nanobioconjugate synthesis. All the synthesized nanobioconjugates exhibited steady and sustained release of the medicinal components conjugated, proving their druggability, and were biocompatible with human cells, demonstrating their safety. The findings of the study validate the anticancer properties of silver nanobioconjugates of Vitis vinifera and its active component resveratrol.

Evaluation of Antibacterial and Antidiabetic Potential of Silver Nanoparticles using Eugenia Uniflora L. Seed Extract

2020 ◽  
Vol 13 (6) ◽  
pp. 5217-5225
Author(s):  
Guru Kumar Dugganaboyana ◽  
Chethankumar Mukunda ◽  
Suresh Darshini Inakanally
Keyword(s):  
Biomedical Applications ◽  
Pathogenic Bacteria ◽  
Seed Extract ◽  
Drug Formulation ◽  
Visible Spectroscopy ◽  
Plant Materials ◽  
X Ray ◽  
Eugenia Uniflora ◽  
Uv Visible

In recent years, green nanotechnology-based approaches using plant materials have been accepted as an environmentally friendly and cost-effective approach with various biomedical applications. In the current study, AgNPs were synthesized using the seed extract of the Eugenia uniflora L. (E.uniflora). Characterization was done using UV-Visible spectroscopy, X-ray diffraction (XRD), scanning electronic microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) analyses. The formation of AgNPs has confirmed through UV-Visible spectroscopy (at 466 nm) by the change of color owing to surface Plasmon resonance. Based on the XRD pattern, the crystalline property of AgNPs was established. The functional group existing in seed of E.uniflora extract accountable for the reduction of Ag+ ion and the stabilization of AgNPs was investigated. The morphological structures and elemental composition was determined by SEM and EDX analysis. With the growing application of AgNPs in biomedical perspectives, the biosynthesized AgNPs were evaluated for their antibacterial and along with their antidiabetic potential. The results showed that AgNPs are extremely effective with potent antidiabetic potential at a very low concentration. It also exhibited potential antibacterial activity against the three tested human pathogenic bacteria. Overall, the results highlight the effectiveness and potential applications of AgNPs in biomedical fields such as in the treatment of acute illnesses as well as in drug formulation for treating various diseases such as cancer and diabetes. It could be concluded that E. uniflora seed extract AgNPs can be used efficiently for in vitro evaluation of their antibacterial and antidiabetic effects with potent biomedical applications.

Solution multinuclear (31P,111Cd,77Se) magnetic resonance studies of cadmium complexes of heterocyclic aromatic thiones and the structure of [tetrakis(2(1H)-pyridinethione)cadmium] nitrate, [Cd(C5H5NS)4](NO3)2

2000 ◽  
Vol 78 (5) ◽  
pp. 590-597 ◽  
Author(s):  
Umarani Rajalingam ◽  
Philip AW Dean ◽  
Hilary A Jenkins
Keyword(s):  
Cadmium Nitrate ◽  
Cadmium Complexes ◽  
Nmr Studies ◽  
X Ray ◽  
X Ray Crystallography ◽  
Stoichiometric Reaction ◽  
Complex Salts ◽  
Reduced Temperature ◽  
Aromatic Heterocyclic ◽  
Phosphine Chalcogenides

The complex salts CdL4(O3SCF3)2 (L = 2(1H)-pyridinethione (Py2SH), 4(1H)-pyridinethione (Py4SH), or 2(1H)-quinolinethione (Q2SH)) have been synthesized by the stoichiometric reaction of Cd(O3SCF3)2 and the appropriate thione. Both ambient-temperature 13C and reduced-temperature 111Cd NMR of CdL4(O3SCF3)2 in solution are consistent with L being bound through sulfur. Reduced-temperature NMR (31P, 77Se, 111Cd, as appropriate) of mixtures of CdL4(O3SCF3)2 and Cd(EPCy3)4(O3SCF3)2 (E = Se, Cy = c-C6H11) and of Cd(EPCy3)4(O3SCF3)2 (E = S, Se) and L in solution provides evidence for various [CdLn(EPCy3)4-n]2+. Similarly, reduced-temperature metal NMR of [CdL4]2+ and [CdL'4]2+ (L, L' = Py2SH, Py4SH, Q2SH; L not equal L') in solution shows the formation of [CdLnL'4-n]2+. Thus it has been demonstrated that at reduced temperature [CdL4]2+ is intact in solution and exchange of L is slow on the timescale of the metal chemical shift differences. From the NMR studies of Cd(EPCy3)4(O3SCF3)2 (E = S, Se):L mixtures, the binding preferences are found to be L > EPCy3 in solution. Similarly, from the reduced temperature metal NMR spectra of mixtures where L and L' compete for Cd(II) in solution, the binding preferences are Py4SH > Py2SH > Q2SH. The structure of Cd(Py2SH)4(NO3)2 (4) has been determined by single crystal X-ray analysis. Colorless crystals of 4 are tetragonal, I4(1)/acd with 8 molecules per unit cell of dimensions a = 18.660(3), c = 15.215(3) Å. The structure is comprised of recognizable NO3- anions and [Cd(Py2SH)4]2+ cations. In the cations, which have S4 symmetry, the ligands are S-bound. A network of NH···O hydrogen bonds links the cations and anions.Key words: aromatic heterocyclic thiones, cadmium complexes, phosphine chalcogenides, 111Cd, 31P, 77Se NMR, X-ray crystallography.

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.

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