A Low-Symmetry Cubic Mesophase of Dendronized CdS Nanoparticles and Their Structure-Dependent Photoluminescence

Masaki Matsubara, Warren Stevenson, Jun Yabuki, Xiangbing Zeng, Haoliang Dong, Kazunobu Kojima, Shigefusa F. Chichibu, Kaoru Tamada, Atsushi Muramatsu, Goran Ungar, Kiyoshi Kanie

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Abstract

A liquid crystal (LC) phase with P213 symmetry, the lowest so far in a cubic LC, was obtained in a system of CdS quantum dots (QDs) modified with a two-layer corona of aliphatic thiols (inner) and LC aromatic dendrons (outer). We propose that the unusual low symmetry of this cubic mesophase is a result of the multi-layered corona, which prefers to adopt an anisotropic radial profile because of the combination of long and short “bristles.” The anisotropic distribution of dendrons (long bristles) in the P213 phase is thought to facilitate π-π interaction among the aromatic moieties. The interaction gives rise to non-radiative exciton energy-transfer pathways that induce photoluminescence quenching of the CdS QDs. This is believed to be the first example of structure-dependent emission-quenching behavior.

Original languageEnglish
Pages (from-to)860-876
Number of pages17
JournalChem
Volume2
Issue number6
DOIs
Publication statusPublished - Jun 8 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Biochemistry, medical
  • Materials Chemistry

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    Matsubara, M., Stevenson, W., Yabuki, J., Zeng, X., Dong, H., Kojima, K., Chichibu, S. F., Tamada, K., Muramatsu, A., Ungar, G., & Kanie, K. (2017). A Low-Symmetry Cubic Mesophase of Dendronized CdS Nanoparticles and Their Structure-Dependent Photoluminescence. Chem, 2(6), 860-876. https://doi.org/10.1016/j.chempr.2017.05.001