An electron spin resonance study of the hydrolytic products formed by titanium(III) trichloride in aqueous and mixed aqueous solutions and frozensolutions

1975 ◽  
Vol 28 (5) ◽  
pp. 999 ◽  
Author(s):  
DJ Cookson ◽  
TD Smith ◽  
JR Pilbrow
Keyword(s):  
Aqueous Solutions ◽  
Room Temperature ◽  
Major Product ◽  
Low Ph ◽  
Electron Spin Resonance Study ◽  
X Band ◽  
Symmetry Properties ◽  
Spin Resonance ◽  
Spin Resonance Study

X-band e.s.r. measurements of aqueous solutions containing titanium(III) trichloride at room temperature and 77 K provide evidence for the formation of aquated Ti(OH)2+ as the major product of hydrolysis at low pH, along with dimeric species Ti2(OH)24+ formed in small amounts. When certain organic solvents miscible with water are present a further hydrolytic product suggested to be Ti2(OH)5+ is found at low pH. Consideration of an interaction spin Hamiltonian which takes into account the symmetry properties of the paramagnetic ion pair systems makes possible the computer simulation of the experimental spectra due to the dimeric species. By this procedure the magnetic parameters associated with the titanium(III) dimers have been evaluated along with a determination of the titanium(III)-titanium(III) ion separations. This information has been used to suggest possible structures for the dimeric species.

An electron spin resonance study of (N-2-Pyridylsalicylaldiminato)copper(II) nitrate

1975 ◽  
Vol 28 (6) ◽  
pp. 1211 ◽  
Author(s):  
TD Smith ◽  
DJ Cookson ◽  
JR Pilbrow ◽  
R Beckett
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Exchange Interactions ◽  
Electron Spin Resonance Study ◽  
Magnetic Exchange ◽  
Spin Resonance ◽  
Dimeric Form ◽  
Spin Resonance Study

The magnetic susceptibility of (N-2-pyridylsalicylaldiminato)copper(II) nitrate and chloride has been measured at room temperature and 97 K. Contrary to results reported previously we find no evidence for the presence of magnetic exchange interactions in these compounds. Electron spin resonance spectral data on the ethanol-dimethylformamide solutions of the chelates show that the chelates are monomeric in the liquid phase but largely in dimeric form in frozen solution. Computer simulation of the experimental e.s.r. spectra due to the dimeric form has enabled a determination of the symmetry arrangement and structural properties of the pair system to be made.

scholarly journals A single-crystal electron spin resonance study of the cyclic 1,2,4,3,5-trithiadiazolyl radical, S3N2+•

1988 ◽  
Vol 66 (5) ◽  
pp. 1299-1303 ◽  
Author(s):  
K. F. Preston ◽  
J.-P. Charland ◽  
L. H. Sutcliffe
Keyword(s):  
Single Crystals ◽  
Experimental Error ◽  
Room Temperature ◽  
Electron Spin Resonance Study ◽  
Spectral Measurements ◽  
Crystal Axis ◽  
Spin Resonance ◽  
Crystal Electron ◽  
Host Cation ◽  
Spin Resonance Study

An anisotropic ESR signal detected in single crystals of 5-methyl-1,3,2,4-dithiazolylium hexafluoroarsenate [Formula: see text] is shown to be that of 1,2,4,3,5-trithiadiazolyl, S3N2+•. The g- and 14N-hyperfine tensors for this radical were established in the monoclinic abc* crystal-axis system from spectral measurements at room temperature on aligned single crystals. Agreement of the principal values of the tensors with those obtained in our earlier studies by simulation of powder spectra is excellent. The g-tensor (2.0021, 2.0072, 2.0248) and the two 14N-tensors (25.4, 0.8, 0.8 MHz) are collinear within experimental error and lie with minimum g and maximum hyperfine perpendicular to the plane of the host cation. The electronic structure of the radical deduced from our earlier studies (2A2 in C2V) is confirmed, and the impurity is shown to substitute for the host cation in the anticipated manner.

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