Tetsuo Nozoe (1902−1996)

doi:10.1002/ejoc.200300579

Cited by 13 publications

(1 citation statement)

References 30 publications

(35 reference statements)

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“…Tp and its derivatives have a polarized resonance structure as shown in Figure a, leading to their 6π-aromaticity with the positively charged seven-membered ring. Much effort has been devoted to the studies of their natural products and biological activities, − while there are limited reports on the photophysical properties of Tp -containing compounds. Nevertheless, some studies of Tp derivatives have revealed their intriguing optical and electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Far-Red to Near-Infrared Emission from Conjugated Polymers with High Density of Excited States Based on a Boron Tropolonate Complex as an Electron Acceptor

Ogoshi,

Takahashi,

Ito

et al. 2024

Macromolecules

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Conjugated polymers composed of donor–acceptor systems have attracted tremendous attention because of their applicability to organic optoelectronic devices, such as polymer solar cells, organic transistors, and biological imaging. Particularly, their light absorption and emission properties in the far-red (FR) to near-infrared (NIR) region are hot topics in the recent research on the development of advanced conjugated polymers. However, compared to electron donors, the lack of variety of electron acceptors still hampers us from meeting various challenges, such as low emission efficiency, low electron mobility, and low stability. Herein, we demonstrate that a boron complex based on tropolone acts as a strong electron acceptor in conjugated copolymers with fluorene (FL), bithiophene (BT), and cyclopentadithiophene (CDT) comonomers, and the synthesized polymers exhibit FR/NIR emissive properties. The tropolonate boron complex, TpB, possesses a highly polarized aromatic seven-membered ring and subsequently strong electron acceptability. Importantly, theoretical calculations for the model compounds revealed that low-lying singlet excited states with different electronic structures should be nearly degenerate because TpB itself has several molecular orbitals around frontier molecular orbitals in the narrow energy range. As a result, the CDT polymer was able to exhibit the most efficient emission in solutions among the polymers, although it showed the longest wavelength luminescence.

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