Electron Spin Resonance Studies on Ti(H2O)63+ in Frozen Aqueous Solutions of Titanium(III) Chloride, Bromide, Iodide, and Sulfate

1975 ◽  
Vol 53 (11) ◽  
pp. 1630-1634 ◽  
Author(s):  
Pavle Ilija Premović ◽  
Paul Ronald West
Keyword(s):  
Electron Spin Resonance ◽  
Aqueous Solutions ◽  
Metal Ion ◽  
Room Temperature ◽  
Local Symmetry ◽  
Coordination Shell ◽  
Frozen Solution ◽  
Counter Ions ◽  
Spin Resonance ◽  
Maximum Signal

Strongly acidic aqueous solutions of titanium(III) chloride, bromide, iodide, or sulfate (0.02 M metal ion) provide no detectable e.s.r. signal at room temperature. In the frozen solution (77 K) an identical spectrum is observed from each sample with [Formula: see text] A maximum signal is observed at 6–8 M added anion, indicating not all titanium(III) species are e.s.r. active. Analysis indicates that the local symmetry of the Ti3+(3d1) ions providing the signal is D3. It is proposed that these ions are Ti(H2O)63+ species located in sites in the ice structure subject to a strong asymmetric electric field from nearby counter ions. Since the spectrum is independent of anion, the counter ions are unlikely to be in the first or second coordination shell of the Ti3+.

scholarly journals The Coordination Chemistry of Phosphoryl Compounds Containing the -N(CH3)2 Group, XII.

1973 ◽  
Vol 28 (3-4) ◽  
pp. 104-106 ◽  
Author(s):  
M.W.G. De Bolster ◽  
B. Nieuwenhuijse ◽  
J. Reedijk
Keyword(s):  
Electron Spin Resonance ◽  
Metal Ion ◽  
Room Temperature ◽  
Esr Spectroscopy ◽  
Hyperfine Coupling ◽  
Hyperfine Coupling Constant ◽  
Zero Field ◽  
Coupling Constant ◽  
Spin Resonance ◽  
Temperature Electron

Room temperature electron spin resonance powder spectra have been recorded for some compounds of the type Mn(ligand)p(anion)2 with hexamethylphosphoramide and nonamethylimidodiphosphoramide as ligands (p = 1 - 4) and BF-4, NO-3, Cl-, Br-, I- and NCS-as anions.The values for the zero-field parameters, D and λ, have been determined and are compared with literature data. It is shown that ESR spectroscopy can be very helpful in elucidating the structures of manganese(II) complexes.The high values for the hyperfine coupling constant of the solvates suggest that in these complexes the bonding between the ligands and the metal ion is essentially ionic.

Electron Spin Resonance Studies in Aqueous Solution: Titanium(III) in the pH Region 1.0–3.5

1974 ◽  
Vol 52 (16) ◽  
pp. 2919-2922 ◽  
Author(s):  
Pavle Ilija Premović ◽  
Paul Ronald West
Keyword(s):  
Aqueous Solution ◽  
Electron Spin Resonance ◽  
Aqueous Solutions ◽  
Electron Spin ◽  
Metal Ion ◽  
Active Species ◽  
Single Line ◽  
Spin Resonance ◽  
Metal Ion Complex

In aqueous solutions of titanium(III) between pH 1.0 and 3.5 a single line e.s.r. signal is recorded with g = 1.9408 ± 0.001 and linewidth 95 ± 3 G. Evidence is presented in support of a hydrolyzed metal ion complex [Ti(OH)2(H2O)4]+ as the likely active species.

Electron spin resonance study of the copper(II) chelates of certain thio ligands

1970 ◽  
Vol 23 (11) ◽  
pp. 2287 ◽  
Author(s):  
JR Pilbrow ◽  
TD Smith ◽  
AD Toy
Keyword(s):  
Electron Spin Resonance ◽  
Carboxylic Acid ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Frozen Solution ◽  
Simulation Procedure ◽  
Spin Resonance ◽  
Frozen Solutions ◽  
Spin Resonance Study

Electron spin resonance measurements have been made on the copper(II) chelates of o-methylmercaptobenzoic acid, S-carboxydiethyldithiocarbamic acid, thiazolidine-4-carboxylic acid, 5-hydroxy-1,3-benzoxathiol-2-one and diacetyl bisthiosemicarbazone. The e.s.r. spectra of dimethylformamide solutions of the chelates have been interpreted in terms of dimeric species which are believed to exist at room temperature, as well as in frozen solutions in the case of o-methyl-mercaptobenzoic acid, S-carboxydiethyldithiocarbamic acid, and 5-hydroxy-1,3-benzoxathiol-2-one, whereas the dimeric forms of the remaining chelates are formed solely in frozen solution. The results have been interpreted as arising from dipole-dipole coupling between the copper(II) ions in their dimeric forms, and a line simulation procedure employed to extract the distance between the copper(II) dipoles. This information has been used to suggest the possible structures of the dimeric species. The effect of the introduction of zinc(II) ions during the formation of the copper(II) chelates has been assessed in each case.

An electron spin resonance study of the copper(II) complexes of Tris(hydroxymethyl) aminomethane formed in aqueous and non-aqueous solution

1971 ◽  
Vol 24 (1) ◽  
pp. 59 ◽  
Author(s):  
PDW Boyd ◽  
JR Pilbrow ◽  
TD Smith
Keyword(s):  
Aqueous Solution ◽  
Computer Simulation ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Frozen Solution ◽  
Low Field ◽  
Spin Resonance ◽  
Spin Resonance Study

The electron spin resonance spectra of copper(II)- tris(hydroxymethyl)amino-methane complexes in aqueous solution provides evidence of the formation of dimeric species. These species are found to be different from those postulated by previous investigations. In dimethylformamide dimeric species are formed at room temperature and frozen solution in 1 : 1 and 1 : 2 metal-to-ligand mole ratios, though the formation of the dimer is critically dependent on the addition of base. Low field, ΔM = 2, signals observed for these systems have been interpreted in terms of dipole-dipole coupling between pairs of copper(II) ions. Structures for the copper(II) dimers have been proposed which are compatible with the copper-copper separation estimated by computer simulation of the spectra.

The isotropic hyperfine interaction in ternary complexes of copper(II) with 8-hydroxyquinoline and various salicylic acids

1983 ◽  
Vol 61 (9) ◽  
pp. 2154-2158 ◽  
Author(s):  
Y. Anjaneyulu ◽  
N. V. S. Rao ◽  
R. Y. Swamy ◽  
R. P. Rao ◽  
V. G. K. M. Pisipati
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Ternary Complexes ◽  
Copper Chelate ◽  
Frozen Solution ◽  
Parallel Lines ◽  
Spin Resonance ◽  
Partial Dissociation ◽  
Salicylic Acids

Electron spin resonance and optical absorption studies are carried out on bis(8-hydroxyquinolinato)copper(II) and seven ternary copper(II) complexes with 8-hydroxyquinoline and salicylic acid or substituted salicylic acids. Electron spin resonance spectra of all these complexes give well-resolved lines. An unusual splitting of the parallel lines in frozen solution spectra and four line fluid (DMF) solution spectra at room temperature are observed. It is explained on the basis of either partial dissociation of 8-hydroxyquinoline ligand or the solvation effect of DMF which solvates some copper chelate molecules even at room temperature. This is more prominent on the parallel lines in frozen solution spectra of all the ternary complexes. The molecular orbital coefficients are estimated assuming an axial symmetry and these indicate that the in-plane π bonding is weak compared to σ-bond in the ternary complexes. The value of χ, which is proportional to hyperfine constants, indicates that it is quite independent of either ligand substitutions or substitutions in the ligand, but purely depends upon the immediate environment which constitutes the coordination around the paramagnetic ion.

scholarly journals Force detection of high-frequency electron spin resonance near room temperature using high-power millimeter-wave source gyrotron

2021 ◽  
Vol 118 (2) ◽  
pp. 022407
Author(s):  
Hideyuki Takahashi ◽  
Yuya Ishikawa ◽  
Tsubasa Okamoto ◽  
Daiki Hachiya ◽  
Kazuki Dono ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Millimeter Wave ◽  
Electron Spin ◽  
High Power ◽  
High Frequency ◽  
Room Temperature ◽  
Force Detection ◽  
Wave Source ◽  
Spin Resonance ◽  
Millimeter Wave Source
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