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Sensitive to position: Quantum-chemical calculations reveal site-specific substituent effects in pentacene via fluorination and methoxylation. The absolute position of HOMO and LUMO levels as well as the bandgap can be tuned independently of each other (see picture), thus paving a route to control electronic levels in (opto)electronic devices with minimum structural modification.
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Milián‐Medina et al. (2008) studied this question.
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