TY - JOUR
T1 - Oligo(ethylene glycol)/alkyl-modified Chromophore Assemblies for Photon Upconversion in Water
AU - Haruki, Rena
AU - Kouno, Hironori
AU - Hosoyamada, Masanori
AU - Ogawa, Taku
AU - Yanai, Nobuhiro
AU - Kimizuka, Nobuo
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI Grant Numbers JP25220805, JP17H04799, JP16H06513, JP16H00844, PRESTO program on “Molecular Technology and Creation of New Functions” from JST (JPMJPR14KE), and The Murata Science Foundation. We are grateful to Prof. D. Kohda, Prof. K. Mayanagi, and Dr. R. Ugawa at Medical Institute of Bioregula-tion, Kyushu University for the TEM observation and helpful discussions about the assembly structure.
Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/5/15
Y1 - 2019/5/15
N2 - Molecular self-assembly is a powerful means to construct nanoscale materials with advanced photophysical properties. Although the protection of the photo-excited states from oxygen quenching is a critical issue, it still has been in an early phase of development. In this work, we demonstrate that a simple and typical molecular design for aqueous supramolecular assembly, modification of the chromophoric unit with hydrophilic oligo(ethylene glycol) chains and hydrophobic alkyl chains, is effective to avoid oxygen quenching of triplet–triplet annihilation-based photon upconversion (TTA-UC). While a TTA-UC emission is completely quenched when the donor and acceptor are molecularly dispersed in chloroform, their aqueous co-assemblies exhibit a clear upconverted emission in air-saturated water even under extremely low chromophore concentrations down to 40 μm. The generalization of this nano-encapsulation approach offers new functions and applications using oxygen-sensitive species for supramolecular chemistry.
AB - Molecular self-assembly is a powerful means to construct nanoscale materials with advanced photophysical properties. Although the protection of the photo-excited states from oxygen quenching is a critical issue, it still has been in an early phase of development. In this work, we demonstrate that a simple and typical molecular design for aqueous supramolecular assembly, modification of the chromophoric unit with hydrophilic oligo(ethylene glycol) chains and hydrophobic alkyl chains, is effective to avoid oxygen quenching of triplet–triplet annihilation-based photon upconversion (TTA-UC). While a TTA-UC emission is completely quenched when the donor and acceptor are molecularly dispersed in chloroform, their aqueous co-assemblies exhibit a clear upconverted emission in air-saturated water even under extremely low chromophore concentrations down to 40 μm. The generalization of this nano-encapsulation approach offers new functions and applications using oxygen-sensitive species for supramolecular chemistry.
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U2 - 10.1002/asia.201801666
DO - 10.1002/asia.201801666
M3 - Article
C2 - 30600914
AN - SCOPUS:85060234294
SN - 1861-4728
VL - 14
SP - 1723
EP - 1728
JO - Chemistry - An Asian Journal
JF - Chemistry - An Asian Journal
IS - 10
ER -