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Weakly bonded (outer-sphere) ET-TSs may certainly be found. Our recent study of radical cation reactivity (ref 14a) shows that these outer-sphere ET-TSs are generally higher in energy than their bonded analogs. The present study focuses on the bonded TSs, which are interesting from the points of view of bonding principles and the general aim of the paper.
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85033049033
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3 radical will most likely couple with the reactant anion radical, which at least initially is present in excess. See ref 4 above.
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55
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85033034587
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note
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We have also inspected the projected frequencies orthogonal to the IRC (using iop(7/45=1) in GAUSSIAN-92, as advised by Schlegel, H. B). The combination of the projected and unprojected modes allowed us to ascertain the changes in the modes discussed in Figure 6.
-
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56
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85033059134
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note
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•. Thus, the extra electron on formaldehyde anion radical lies on the O center, and as such the O center might have been considered as the effective electron donor site.
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‡ = fG - B (G is the vertical gap in the avoided crossing diagram, f is the fraction of G that enters under the crossing point, and B is the avoided crossing resonance energy). Since SUB(C) possesses a preferred thermodynamic factor, its respective/value is smaller that that for the ET reaction, which in contrast has a smaller G value. In such a situation it is shown that when G is small, ET will possess the smaller barrier, and vice versa when G is large.
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85033058010
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note
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-. In fact, this increase in the spin density on the oxygen atom at the ET-TS relative to the CR cluster is apparent in all the population analyses used, at all the possible levels studied here.
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