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Synthesis of water-soluble Ni(II) complexes and their role in photo-induced electron transfer with MPA-CdTe quantum dots

  • Niharika Krishna Botcha
  • Rithvik R. Gutha
  • Seyed M. Sadeghi
  • Anusree MukherjeeEmail author
Original article
  • 31 Downloads

Abstract

Photocatalytic water splitting using solar energy for hydrogen production offers a promising alternative form of storable and clean energy for the future. To design an artificial photosynthesis system that is cost-effective and scalable, earth abundant elements must be used to develop each of the components of the assembly. To develop artificial photosynthetic systems, we need to couple a catalyst for proton reduction to a photosensitizer and understand the mechanism of photo-induced electron transfer from the photosensitizer to the catalyst that serves as the fundamental step for photocatalysis. Therefore, our work is focused on the study of light driven electron transfer kinetics from the quantum dot systems made with inorganic chalcogenides in the presence of Ni-based reduction catalysts. Herein, we report the synthesis and characterization of four Ni(II) complexes of tetradentate ligands with amine and pyridine functionalities (N2/Py2) and their interactions with CdTe quantum dots stabilized by 3-mercaptopropionic acid. The lifetime of the quantum dots was investigated in the presence of the Ni complexes and absorbance, emission and electrochemical measurements were performed to gain a deeper understanding of the photo-induced electron transfer process.

Graphic abstract

Keywords

Nickel complexes Quantum dots Photo-induced electron transfer Biomimetic systems Artificial photosynthesis 

Abbreviations

AP

Artificial photosynthesis

QDs

Quantum dots

MPA

3-Mercaptopropionic acid

UV–Vis

Ultraviolet-Visible

Ksv

Stern–Volmer quenching constant

kq

Bimolecular quenching rate constant

TCSPC

Time-correlated single-photon counting

Eg

Bandgap

Evb

Valence band energy level

Ecb

Conduction band energy level

NHE

Normal hydrogen electrode

NMR

Nuclear magnetic resonance

ESI–MS

Electrospray ionization mass spectrometry

RT

Room temperature

Notes

Acknowledgements

This work was funded by the University of Alabama in Huntsville, Individual Investigator Distinguished Research (IIDR) awards to Anusree Mukherjee and Seyed M. Sadeghi.

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interest.

Supplementary material

11120_2019_668_MOESM1_ESM.docx (8.9 mb)
Supplementary material 1 (DOCX 9114 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Niharika Krishna Botcha
    • 1
  • Rithvik R. Gutha
    • 2
  • Seyed M. Sadeghi
    • 2
  • Anusree Mukherjee
    • 1
    Email author
  1. 1.Department of ChemistryThe University of Alabama in HuntsvilleHuntsvilleUSA
  2. 2.Department of Physics and AstronomyThe University of Alabama in HuntsvilleHuntsvilleUSA

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