Insensitivity of Vanadyl−Oxygen Bond Strengths to Radical Type (2A1uvs2A2u) in Vanadyl Porphyrin Cation Radicals

1999 ◽  
Vol 38 (7) ◽  
pp. 1543-1547 ◽  
Author(s):  
Kazimierz Czarnecki ◽  
Leonard M. Proniewicz ◽  
Hiroshi Fujii ◽  
David Ji ◽  
Roman S. Czernuszewicz ◽  
...  
Keyword(s):  
Cation Radicals ◽  
Vanadyl Porphyrin ◽  
Bond Strengths ◽  
Radical Type ◽  
Oxygen Bond ◽  
Porphyrin Cation

The nature of the sulphur-oxygen bond

1950 ◽  
Vol 200 (1062) ◽  
pp. 409-428 ◽  
Keyword(s):  
Molecular Orbital ◽  
Electronic Structures ◽  
Chemical Properties ◽  
Orbital Method ◽  
Physical And Chemical Properties ◽  
Bond Strengths ◽  
Set Up ◽  
Physical And Chemical ◽  
Oxygen Bond ◽  
And Chemical Properties

The electronic structures of certain molecules containing oxy-sulphur bonds are analyzed insome detail by means of the molecular orbital method. I t is possible to make rough calculations which, despite the complexity of the system s considered, are nevertheless reasonably reliable. The physical and chemical properties of sulphur dioxide, sulphur trioxide and molecules of the types R 2 SO 2 and R 2 SO are discussed on the basis of these structures. In all these molecules it appears that the oxy-sulphur linkages are best described as double-bonded. A successful correlation between the molecular orbital criterion of bond strengths, namely, the bond orders, and the oxy-sulphur bond force constants may be set up. The measure of agreement attained between observed and predicted properties is quite satisfactory.

Spin-density distributions in meso-alkyl/aryl hybrid porphyrin cation radicals

1988 ◽  
Vol 27 (8) ◽  
pp. 1510-1512 ◽  
Author(s):  
Michael Atamian ◽  
Richard W. Wagner ◽  
Jonathan S. Lindsey ◽  
David F. Bocian
Keyword(s):  
Spin Density ◽  
Alkyl Aryl ◽  
Cation Radicals ◽  
Density Distributions ◽  
Porphyrin Cation

Oxoferryl porphyrin cation radicals in model systems: Evidence for variable metal-radical spin coupling

1990 ◽  
Vol 58 (1-4) ◽  
pp. 2343-2348 ◽  
Author(s):  
E. Bill ◽  
E. L. Bominaar ◽  
X. -Q. Ding ◽  
A. X. Trautwein ◽  
H. Winkler ◽  
...  
Keyword(s):  
Spin Coupling ◽  
Model Systems ◽  
Cation Radicals ◽  
Porphyrin Cation ◽  
Metal Radical

Conformational and substituent effects on spin distributions in porphyrin cation radicals

1990 ◽  
Vol 94 (23) ◽  
pp. 8508-8511 ◽  
Author(s):  
M. W. Renner ◽  
R. J. Cheng ◽  
C. K. Chang ◽  
Jack. Fajer
Keyword(s):  
Substituent Effects ◽  
Cation Radicals ◽  
Spin Distributions ◽  
Porphyrin Cation

Analytical Figures of Merit and Interelement Effects with Air and Nitrogen Microwave-Induced Plasmas

1986 ◽  
Vol 40 (6) ◽  
pp. 877-883 ◽  
Author(s):  
John J. Urh ◽  
Jon W. Carnahan
Keyword(s):  
Matrix Effects ◽  
Detection Limits ◽  
Analytical Signal ◽  
Air Plasma ◽  
Excitation Energies ◽  
Phosphate Ions ◽  
Loading Matrix ◽  
Bond Strengths ◽  
High Concentrations ◽  
Oxygen Bond

A microwave (2450 MHz)-induced plasma (MIP) with nitrogen nebulization and plasma gases was developed and compared with an air-MIP similar to that previously reported in our laboratories. These plasmas were maintained at 300 to 500 W of forward power and were stable with pneumatic nebulized aqueous solution introduction. In general, metals with high metal-oxygen bond strengths, high excitation energies, and low ionization potentials exhibited superior detection limits in the N2-MIP. Several elements with emission lines in N2 and N2+ spectral regions yielded better detection limits in the air plasma. The effects of high concentrations (2%) of calcium, potassium, sodium, and phosphate ions upon the analytical signal intensities were examined. During direct solution nebulization, the analytical signals of both plasmas exhibited significant but predictable interferences from metals of low ionization potential and plasma loading. Matrix effects were more significant in the N2-MIP.

Long-Lived Porphyrin Cation Radicals Protected in Unimer Micelles of Hydrophobically-Modified Polyelectrolytes

1996 ◽  
Vol 29 (20) ◽  
pp. 6505-6509 ◽  
Author(s):  
Yotaro Morishima ◽  
Hiroyuki Aota ◽  
Kazunori Saegusa ◽  
Mikiharu Kamachi
Keyword(s):  
Cation Radicals ◽  
Hydrophobically Modified ◽  
Porphyrin Cation

ChemInform Abstract: Conformational and Substituent Effects on Spin Distributions in Porphyrin Cation Radicals

ChemInform ◽  
2010 ◽  
Vol 22 (8) ◽  
pp. no-no
Author(s):  
M. W. RENNER ◽  
R.-J. CHENG ◽  
C. K. CHANG ◽  
J. FAJER
Keyword(s):  
Substituent Effects ◽  
Cation Radicals ◽  
Spin Distributions ◽  
Porphyrin Cation
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