Molecular design, synthesis, and properties of highly fluorescent polyimides.
作者： Junji Wakita , Hiroyuki Sekino , Kosaku Sakai , Yuichi Urano , Shinji Ando
DOI: 10.1021/JP9072922
关键词:
摘要: To develop a molecular design concept for highly fluorescent polyimides (PIs), ultraviolet−visible optical absorption spectra and excitation/emission of PI thin films were extensively investigated with the aid density functional theory calculations. It was clarified that fully aromatic PIs (Ar-PIs) have strong charge transfer (CT) interactions, their lowest excited states are attributable to CT(π−π*) which emit weak fluorescence. The CT interactions in effectively suppressed by using alicyclic diamines as source material, regardless dianhydride structure. This is due nonaromatic nature electron-donating property diamines. Al-PIs derived from dianhydrides having delocalized π conjugation an diamine LE(π−π*) In particular, ether (−O−) linkages moiety demonstrated strongest blue pho...
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