Chirality Inversion of CdSe and CdS Quantum Dots without Changing the Stereochemistry of the Capping Ligand

Jung Kyu Choi, Benjamin E. Haynie, Urice Tohgha, Levente Pap, K. Wade Elliott, Brian M. Leonard, Sergei V. Dzyuba, Krisztina Varga, Jan Kubelka, Milan Balaz

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44 Citations (Scopus)

Abstract

l-cysteine derivatives induce and modulate the optical activity of achiral cadmium selenide (CdSe) and cadmium sulfide (CdS) quantum dots (QDs). Remarkably, N-acetyl-l-cysteine-CdSe and l-homocysteine-CdSe as well as N-acetyl-l-cysteine-CdS and l-cysteine-CdS showed "mirror-image" circular dichroism (CD) spectra regardless of the diameter of the QDs. This is an example of the inversion of the CD signal of QDs by alteration of the ligand's structure, rather than inversion of the ligand's absolute configuration. Non-empirical quantum chemical simulations of the CD spectra were able to reproduce the experimentally observed sign patterns and demonstrate that the inversion of chirality originated from different binding arrangements of N-acetyl-l-cysteine and l-homocysteine-CdSe to the QD surface. These efforts may allow the prediction of the ligand-induced chiroptical activity of QDs by calculating the specific binding modes of the chiral capping ligands. Combined with the large pool of available chiral ligands, our work opens a robust approach to the rational design of chiral semiconducting nanomaterials.

Original languageEnglish
Pages (from-to)3809-3815
Number of pages7
JournalACS Nano
Volume10
Issue number3
DOIs
Publication statusPublished - 2016 Mar 22

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Choi, J. K., Haynie, B. E., Tohgha, U., Pap, L., Elliott, K. W., Leonard, B. M., Dzyuba, S. V., Varga, K., Kubelka, J., & Balaz, M. (2016). Chirality Inversion of CdSe and CdS Quantum Dots without Changing the Stereochemistry of the Capping Ligand. ACS Nano, 10(3), 3809-3815. https://doi.org/10.1021/acsnano.6b00567