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Linewidth effect, alternating

The alternating linewidth effect arises because hyperfine couplings fluctuate due to some inter- or intramolecular process. Selective broadening of the lines in the... [Pg.348]

In Reference 4, this "alternating linewidth" effect (8) was shown to be consistent with a temperature dependent pseudorotation in Kj. A correlation diagram, which relates transition fields for the three obtuse angled trimer geometries, qualitatively predicts line broadening for M = + and h when pseudorota-... [Pg.75]

Alternating linewidth effect due to ring inversion. Similar a-values obtained as at 303 K. [Pg.284]

Determination of dissociation enthalpy. Broad ENDOR signals, dynamic line-shape effects. 2 ) da/dr=1.5-10- TK-h Assignment to molecular positions not established experimentally. Broad ENDOR signals. Inequivalence observed at low temperatures — 0.455 mX (2H) at 210 K, alternating linewidth effects. ... [Pg.309]

This is a consequence of reducing the lifetime of a particular spin state an analysis of the lineshape yields the rate constant k2, which equals k-2. Radicals able to undergo conformational change show a spectral phenomenon called the alternating linewidth effect. A temperature-dependence study of this effect will yield activation parameters [energy and entropy, Eq. (2)] for this first-order process. [Pg.16]

C,oH2,02Pb]- H3C OPb(CH2CH3)3 / C-C / 0 CH3 With alternating linewidth effect. Phot, of cyclopentadienyltriethyl-lead in the presence of biacetyl/ Toluene EPR/ 240 2.0053 6H(CH3) 0.67 82Davl... [Pg.289]

Apparently trans derivative [82Davl]. 41 M Pb) Q QQ275 mT K dT With alternating linewidth effect. ... [Pg.290]

With alternating linewidth effect. Conditions of rapid exchange. Also phot, of hexamethylditin in the presence of biacetyl. Also other generations. ... [Pg.291]

Addition of carbon-centred radicals gives irons adducts, whereas oxygen-centred species give cis. Little evidence for diastereoisomers as evidenced by EPR but alternating linewidth effects for some radicals. ... [Pg.57]

Stereoselectivity of radical addition is poor, with two diastereoisomers observed in most cases, but no alternating linewidth effects. ... [Pg.347]

Adducts show alternating linewidth effects, and two diastereoisomers formed with most radicals examined. Traps undergo ready nucleophilic addition of alcohols in neat solution in presence of Fe, resultant adducts decay in presence of H O to give HO adduct. ... [Pg.347]

Alternating linewidths. ) Discussion of line width effects by ring inversion. ... [Pg.310]

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