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Author Li, Fengqing ♦ Liu, Dongzhi ♦ Wang, Tianyang ♦ Hu, Jianxin ♦ Meng, Fancui ♦ Sun, Haiya ♦ Shang, Zhi ♦ Li, Pingan ♦ Feng, Wenhui ♦ Li, Wei ♦ Zhou, Xueqin
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ABSORPTION SPECTRA ♦ DIPOLE MOMENTS ♦ EXCITED STATES ♦ FLUORESCENCE SPECTROSCOPY ♦ NANOPARTICLES ♦ PORPHYRINS ♦ RAMAN SPECTRA ♦ RED SHIFT ♦ SYNTHESIS
Abstract In this report, L-diphenylalanine-decorated tetraphenylporphyrin (TPPtFF{sub C}) was synthesized and self-assembled into regular nano-architechtures. The morphology of the assemblies varied with the concentration of TPPtFF{sub C}. The absorption spectra of the nanoparticles show the Soret band merges with the Q bands and redistributes with great red-shift, indicative of the formation of J-aggregates of the porphyrin molecules. The fluorescence emission of the nanoparticles is merged and red-shifted to near-infrared region. Studies of absorption and fluorescence spectra reveal an indispensible role of diphenylalanine group in the formation of J-aggregates. The Raman spectra disclose that diprotonation of the porphyrin core contributes to delocalized coherent excited states in the nanoparticles. The positive cotton effect in circular dichroism spectra corresponding to the Soret band of TPPtFF{sub C} in solution confirms the formation of J-aggregates with right-handed chirality of the dipole moment. This report will shed light on the rational design of porphyrin-peptide conjugates to mimic naturally light-harvesting complexes. - Graphical abstract: TPPtFF{sub C} was synthesized and self-assembled into regular nano-architectures. Photophysical property studies of the nanoparticles indicate the porphyrin molecules form typical J-aggregates. The diprotonation of the porphyrin core and the FF group play an indispensible role in the formation of J-aggregates. - Highlights: • Porphyrin-peptide conjugates were self-assembled into regular nanostructures. • The photophysical properties of the nanoparicles indicate formation of typical J-aggregates. • The Raman spectra confirm that diprotonation of the porphyrin core contributes to exciton coherence in the nanoparticles.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-08-15
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 252


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