Abstract
The absorption of the charge resonance (CR) bands of dimer radical cations of meso- and rac-2,4-di(N-carbazolyl)pentanes (m- and r-DCzPe), and trans-1,2-di(N-carbazolyl)cyclobutane (DCzBu) was observed by nanosecond laser photolysis. The band peaks for m-DCzPe, r-DCzPe and DCzBu appeared around 1600, 1800 and 2000 nm, respectively. The peaks were shifted to shorter wavelengths with increasing overlapping of two carbazole chromophores. That is, the band gap of the CR band becomes larger with increasing interaction with the neighboring chromophore.
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