Transition metal acetates

1968 ◽  
Vol 46 (22) ◽  
pp. 3443-3446 ◽  
Author(s):  
D. A. Edwards ◽  
R. N. Hayward
Keyword(s):  
Solid State ◽  
Thermogravimetric Analysis ◽  
Transition Metal ◽  
Infrared Spectra ◽  
Magnetic Moments ◽  
Acetate Group ◽  
Visible Spectra

Some anhydrous transition metal acetates (Mn(II), Co(II), Cu(II), Ni(II), Zn(II), Ag(I), Mo(II), Ce(III), La(III)) have been prepared and their infrared spectra measured in the solid state. The infrared spectra have been related to established modes of bonding of the acetate group to metals. Thermal decompositions of the anhydrous acetates have been investigated by thermogravimetric analysis; magnetic moments and visible spectra have been measured.

Synthesis and infrared spectra of some transition metal complexes of α-amino acid esters

1967 ◽  
Vol 20 (4) ◽  
pp. 675 ◽  
Author(s):  
RW Hay ◽  
LJ Porter
Keyword(s):  
Amino Acid ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Amino Acid Esters ◽  
Visible Spectra ◽  
Metal Ratio ◽  
Acid Esters

A variety of transition metal complexes of a-amino acid esters have been synthesized, and characterized by analysis, conductivity measurements, and infrared spectra. The complexes can be broadly divided into two groups: (a) complexes in which only a metal-nitrogen bond occurs with the α-amino group of the ester, and (b) complexes in which chelate ring formation occurs via secondary donor groups on the ligand. These latter complexes are found with methyl L-histidinate, methyl γ-glutamate, and methyl L-cysteinate. With the exception of a methyl tryptophanate complex, the infrared spectra show that there is no interaction between the carbonyl group of the ester and the metal ion. The visible spectra of aqueous solutions of the esters and copper(II) at a ligand/metal ratio of 5 : 1 have maxima in the 600-650 mμ range at pH 7 consistent with copper-nitrogen bonding only.

Carboxylic Esters as Ligands. II. Transition metal complexes of Diethyl Acetonedicarboxylate, Ethyl Acetoacetate, and Diethyl oxaloacetate

1967 ◽  
Vol 20 (9) ◽  
pp. 1829 ◽  
Author(s):  
RW Hay ◽  
BP Caughley
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Schiff Bases ◽  
Transition Metal Complexes ◽  
Infrared Spectra ◽  
Ethyl Acetoacetate ◽  
Magnetic Moments ◽  
Magnetic Data ◽  
Keto Esters ◽  
Metal Metal

The preparation, infrared spectra, magnetic data, and reactions of a variety of transition metal complexes of diethyl acetonedicarboxylate are described. The infrared spectra indicate chelate ring formation with a metal-oxygen bond with the carbonyl group of the ester. Transesterification reactions with alcohols occur much less readily with these complexes than with the corresponding metal oxaloacetates. Bis(ethyl acetoacetato)copper(II) undergoes methanolysis rather than trans-esterification on refluxing with methanol to give a bright blue methoxy-bridged polymer with an abnormally low magnetic moment (μeff 1.14 B.M. at 17�), presumably indicating metal-metal interaction. The magnetic moments of various transition metal complexes of ethyl acetoacetate and diethyl oxaloacetate have also been determined. The β-keto esters have been condensed with 1,2-diaminoethane to give N,N?-bis Schiff bases which exist predominantly as the enamine tautomer in the solid state and in solution. Attempts to prepare copper(II) complexes of these Schiff bases in aqueous ethanol have been unsuccessful as the ligands rapidly hydrolyse in the presence of copper(II) ions.

Transition Metal(II) Complexes of the Azines

1969 ◽  
Vol 23 (2) ◽  
pp. 160-164 ◽  
Author(s):  
J. R. Ferraro ◽  
J. Zipper ◽  
W. Wozniak
Keyword(s):  
Transition Metal ◽  
Infrared Spectra ◽  
Magnetic Moments ◽  
Reflectance Spectra ◽  
Physical Methods ◽  
Octahedral Environment

The complexes of the Mn(II), Fe (II), Co(II), Ni(II), and Gu(II) halides with pyrazine (1,4-diazine), pyrimidine (1,3-diazine), and pyridazine (1,2-diazine) were prepared and studied by various physical methods. Reflectance spectra, infrared spectra from 4000–80 cm−1, and magnetic moments were determined. The data are suggestive of an octahedral environment involving halide and azine bridging in the 1: 1 complexes, and an octahedral environment involving halide bridging and terminal azines in the 1: 2 complexes.

Transition Metal Complexes of 5-(Pyridin-2-yl)tetrazole and Methyl-Substituted 5-(Pyridin-2-yl)tetrazoles

1979 ◽  
Vol 32 (8) ◽  
pp. 1669 ◽  
Author(s):  
NS Gill ◽  
F Yang
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Magnetic Moments ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural Relationships ◽  
Visible Spectra ◽  
Diffraction Patterns

Transition metal complexes of the formulae M(ptt)2,2H2O (M = Mn, Fe, Co, Cu, Zn), M(ptt)2,- 2NH3,H2O (M = Co, Ni), FeCl(ptt),2H2O, Ag(ptt), Mn(tmptt)2,2H2O M(tmptt)2,NH3,2H2O (M = Cu, Zn)M(tmptt)2NH32H2O (M=Co, Ni), Ni(tmptt)2,2NH3,H2O, Ag(tmptt), M(smptt)2 (M = Co, Ni), Cu(smptt)2,3H2O, Cu(smptt)2,NH3,2H2O, Cu(smptt)2,2NH3, Zn(smptt)2,NH3,H2O and Ag(smptt) where ptt, tmptt and smptt are the anions of 5-(pyridin-2-yl)tetrazole, 5-(3-methylpyridin- 2-yl)tetrazole and 5-(6-methylpyridin-2 yl)tetrazole, respectively, have been prepared.Studies of the infrared and ultraviolet-visible spectra, magnetic moments and X-ray diffraction patterns show structural relationships between compounds and indicate that, in addition to the organic ligands, water and ammonia molecules are bonded to the metal ions. Thermal decomposition of the compounds proceeds through the formation of pyridinecarbonitriles.

Coordination Compounds of Substituted 1,10-Phenanthrolines and Related Dipyridyls. II. Complexes of Iron and 2,9-Dimethyl-1,10-phenanthroline

1962 ◽  
Vol 15 (2) ◽  
pp. 235 ◽  
Author(s):  
DB Fox ◽  
JR Hall ◽  
RA Plowman
Keyword(s):  
Solid State ◽  
General Formula ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Magnetic Moments ◽  
Tetrahedral Complexes ◽  
Covalently Bound

A number of mono and bis(che1ate) complexes of iron(II) and 2,9-dimethyl-1,10-phenanthroline (dmp) have been isolated. The mono complexes are of general formula FedmpX2, where X=Cl, Br, I ; 2X=SO4. They are yellow to brown in colour except for the sulphato complex, which is pink. Conductivity and cryoscopic measurements indicate that the halogeno compounds are nonelectrolytes and monomeric. The magnetic moments range from 5.1 to 5.4 B.M. The evidence points to these compounds being four-coordinate tetrahedral complexes. The bis(che1ate)complexes are Fe(dmp)2(NO3)2(H2O)2 and Fe(dmp)2(NO3)(ClO4)(H2O)2, both yellow crystalline substances. They are 1 : 1 electrolytes in nitrobenzene and nitromethane. The magnetic moments are 5.2 B.M. for the dinitrate and 5.05 B.M. for the nitrate-perchlorate. According to their infrared spectra, each compound in the solid state appears to contain covalently bound nitrate and is most probably six-coordinate.

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.

Magnetic Volume Effect of Hydrogen Diffusion in Palladium

2020 ◽  
Vol 310 ◽  
pp. 29-33
Author(s):  
Sarantuya Nasantogtokh ◽  
Xin Cui ◽  
Zhi Ping Wang
Keyword(s):  
Transition Metal ◽  
Density Of States ◽  
Density Functional ◽  
Hydrogen Diffusion ◽  
Magnetic Moments ◽  
Interstitial Site ◽  
Volume Effect ◽  
Face Centered Cubic ◽  
Hydrogen Atoms ◽  
Octahedral Interstitial Site

The electronic and magnetic properties of palladium hydrogen are investigated using first-principles spin-polarized density functional theory. By studying the magnetic moments and electronic structures of hydrogen atoms diffusing in face-centered cubic structure of transition metal Pd, we found that the results of magnetic moments are exactly the same in the two direct octahedral interstitial site-octahedral interstitial site diffusion paths-i.e. the magnetic moments are the largest in the octahedral interstitial site, and the magnetic moments are the lowest in saddle point positions. We also studied on the density of states of some special points, with the result that the density of states near the Fermi level is mainly contributed by 4d electrons of Pd and the change of magnetic moments with the cell volume in the unit cell of transition metal Pd with a hydrogen atom.

scholarly journals Electronic Phenomena of Transition Metal Oxides

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 256
Author(s):  
Christian Rodenbücher ◽  
Kristof Szot
Keyword(s):  
Solid State ◽  
Transition Metal ◽  
Metal Oxides ◽  
Real World ◽  
Transition Metal Oxides ◽  
Major Research ◽  
Research Fields ◽  
Real World Applications

Transition metal oxides with ABO3 or BO2 structures have become one of the major research fields in solid state science, as they exhibit an impressive variety of unusual and exotic phenomena with potential for their exploitation in real-world applications [...]

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