The Royal Society of Chemistry Acta Medica Okayama 2046-2069 13 6 2023 Solvent-dependent fluorescence behaviour of imide-fused [n]phenacenes (n=3, 5, 7) 4096 4101 EN Keito Nose Division of Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University Kaito Yoshioka Division of Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University Minoru Yamaji Division of Molecular Science, Graduate School of Science and Engineering, Gunma University Fumito Tani Institute for Materials Chemistry and Engineering, Kyushu University Kenta Goto Institute for Materials Chemistry and Engineering, Kyushu University Hideki Okamoto Division of Molecular Sciences, Graduate School of Natural Science and Technology, Okayama University Imide-fused [n]phenacenes (nPDIs, n = 3, 5, 7) were systematically synthesised and their electronic features were investigated by electrochemical and electronic spectral measurements. nPDIs showed two reduction waves attributed to formation of radical ions and dianions. 3PDI produced blue fluorescence independent of solvent polarity. In contrast, 5PDI and 7PDI displayed marked positive solvatofluorochromism due to intramolecular charge transfer characters between the imide moieties and phenacene pi cores in the excited state. The spectral features were analyzed by the Lippert-Mataga relationship and theoretical calculations. No potential conflict of interest relevant to this article was reported.

The Royal Society of Chemistry Acta Medica Okayama 1473-0197 9 22 2009 Fabricating small-scale, curved, polymeric structures with convex and concave menisci through interfacial free energy equilibrium 3306 3309 EN Chao-Min Cheng Koji Matsuura I-Jan Wang Yuka Kuroda Philip R. LeDuc Keiji Naruse Polymeric curved structures are widely used in imaging systems including optical fibers and microfluidic channels. Here, we demonstrate that small-scale, poly(dimethylsiloxane) (PDMS)-based, curved structures can be fabricated through controlling interfacial free energy equilibrium. Resultant structures have a smooth, symmetric, curved surface, and may be convex or concave in form based on surface tension balance. Their curvatures are controlled by surface characteristics (i.e., hydrophobicity and hydrophilicity) of the molds and semi-liquid PDMS. In addition, these structures are shown to be biocompatible for cell culture. Our system provides a simple, efficient and economical method for generating integrateable optical components without costly fabrication facilities. No potential conflict of interest relevant to this article was reported.

The Royal Society of Chemistry Acta Medica Okayama 2040-2503 2 7 2011 Quantification of the orientations of pyrrolidine-based oxypeptide nucleic acid–DNA hybrid duplexes 607 610 EN Mizuki Kitamatsu Masahiko Sisido We describe the fluorescence quenching-based quantification of complementary parallel and antiparallel hybrids of DNAs with pyrrolidine-based oxypeptide nucleic acids (POPNAs). When BODIPY-modified DNAs as fluorescent probe formed hybrids with complementary POPNAs, fluorescence of the BODIPY was effectively quenched by the guanine unit and the Lys unit on the POPNAs. The orientations of hybrids of POPNA with DNA were estimated by the quenching efficiencies of two BODIPY-modified DNAs . As a result, we clarified that configurations of POPNAs affect the extent of orientation of the hybrid duplexes. No potential conflict of interest relevant to this article was reported.