W BAND EPR SPECTRA OF SEMIQUINONES
W BAND EPR SPECTRA OF SEMIQUINONES
批准号:
6120603
负责人:
AMBAR JAIN
金额:
$0.65万
依托单位国家:
美国
项目类别:
财政年份:
1998
资助国家:
美国
项目状态:
已结题
起止时间:
1998-04-15 至 1999-11-30
中文摘要
半醌自由基的极高频EPR (95GHz)光谱
英文摘要
Very high frequency EPR (95GHz) spectra of semiquinone radicals in
frozen solution are reported. At this frequency, the increased Zeeman
interaction readily resolves the anisotropic components of the
g-matrix. The radical-solvent interactions are important in
understanding the structural variations in the g-matrix. We have used
a variety of solvents, both polar and nonpolar, to generate
semiquinone radicals from various quinones and have measured the
g-anisotropy. For the most part, the hyperfine splittings remain
unresolved, even in deuterated solvents. Comparison of the g-matrix
of semiquinone radicals in different solvents is quite important and
hydrogen-bonding has been known to play a remarkable effect on
specific components of the g-matrix. Thus the role of hydrogen bonds
during the semiquinone radical formation is of particular importance
to understand their formation in in vivo systems. There are
consistent trends in the variation of the components of the g-matrix
with respect to the nature of the solvents and structure. These
trends can be understood in the light of SCF-MO (both ab initio and
semi-empirical) calculations of the g-tensor, which show that the
g-tensor is sensitive to both hydrogen bonding and ion-pair formation.
These computations have become much more accurate and efficient during
this grant year. This is an ongoing multi-year project.
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W BAND EPR SPECTRA OF SEMIQUINONES
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批准号:6251738
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项目类别:
-
资助金额:$0.42万
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财政年份:1997
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负责人:AMBAR JAIN
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依托单位:
W BAND EPR SPECTRA OF SOLID STATE SEMIQUINONE RADICALS
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批准号:6251752
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项目类别:
-
资助金额:$0.42万
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财政年份:1997
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负责人:AMBAR JAIN
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依托单位:
DEVELOPMENT OF STANDARD PROCEDURE TO QUANTIFY SULFUR RADICAL CONTENT
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批准号:5223626
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项目类别:
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资助金额:$0.0万
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财政年份:--
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负责人:AMBAR JAIN
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依托单位:--
W BAND EPR SPECTRA OF SOLID STATE SEMIQUINONE RADICALS
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批准号:5223625
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项目类别:
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资助金额:$0.0万
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财政年份:--
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负责人:AMBAR JAIN
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依托单位:--
W BAND EPR SPECTRA OF SEMIQUINONES
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批准号:5223619
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项目类别:
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资助金额:$0.0万
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财政年份:--
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负责人:AMBAR JAIN
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依托单位:--
海外基金