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Narrowing the gap: A compactly fused π-conjugated molecule combines a high-lying HOMO with a low-lying LUMO (Eox−Ered=0.52 eV) and a fairly low-lying LUMO+1 on the bridging unit, giving rise to strong optical charge-transfer transitions. A facile electron transfer has been observed by EPR and NMR spectroscopies.
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Guegano et al. (2008) studied this question.
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