Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2022 Feb 22;2(3):205-213.
doi: 10.1021/acsorginorgau.1c00040. eCollection 2022 Jun 1.

Dual Role of MoS2 Quantum Dots in a Cross-Dehydrogenative Coupling Reaction

Komal Jaiswal  1 , Yarabahally R Girish  2 , Pradipta Behera  1 , Mrinmoy De  1
Affiliations

Dual Role of MoS2 Quantum Dots in a Cross-Dehydrogenative Coupling Reaction

Komal Jaiswal et al. ACS Org Inorg Au. .

Abstract

Modern day research focuses on the development of greener and eco-friendlier protocols to fabricate biologically relevant targets with minimal waste generation. C-C bond formation reactions are of prime importance in this regard. In a typical photocatalytic hydrogen evolution reaction, three components are used, viz, catalyst, photosensitizer, and sacrificial amine donor. Among these, the photosensitizer and sacrificial amine donors are wasted at the end of the reaction. Considering these drawbacks, in this work, we have developed a methodology targeted at the utilization of sacrificial amine donors for C-H functionalization with MoS2 quantum dots (QDs) as the catalyst as well as the photosensitizer. QDs indeed emerged to be an active participant in the heterogeneous electron transfer process. This concept opens up new possibilities in the field of nanomaterial-based photomediated organic transformations without the aid of any external photosensitizers via a clean and sustainable protocol with no side product.

PubMed Disclaimer

Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. Photomediated Oxidation and Reduction Cycle of MoS2 QDs
The reduction cycle produces H2 from water, and the oxidative cycle culminates in the CDC product.
Figure 1
Figure 1
TEM characterization of MoS2 blue QDs: (a) TEM image (inset: magnified image of the area enclosed in the rectangle); (b) HRTEM image; (c) SAED pattern confirming the crystalline nature of the QDs and a trigonal prismatic arrangement of the atoms.
Figure 2
Figure 2
(a) UV–visible spectrum (red) and fluorescence spectrum (blue) of MoS2 blue QDs: the former confirms the absence of a C-dot (inset: naked eye visualization of the as-prepared QDs in (i) white light and (ii) UV light). (b) Fourier transform infrared spectrum showing the Mo–S vibration peak.
Figure 3
Figure 3
(a) PXRD pattern of MoS2 QDs confirms the presence of discrete layered material and hexagonal arrangement of Mo and S. (b) Zeta-potential measurement explaining the exceptional stability of the MoS2 QDs solution.
Chart 1
Chart 1
a
Scheme 2
Scheme 2. Proposed Mechanism for the Catalytic Activity of MoS2 Blue QDs in CDC Reaction Synchronized with HER
Figure 4
Figure 4
(a) CV studies for HET analysis of hydrothermally prepared MoS2 QDs. (b) Recyclability of the MoS2 QDs for the CDC reaction.
See this image and copyright information in PMC

References

    1. Tian Z.; Zhang X.; Li D.; Zhou D.; Jing P.; Shen D.; Qu S.; Zboril R.; Rogach A. L. Full-Color Inorganic Carbon Dot Phosphors for White-Light-Emitting Diodes. Adv. Opt. Mater. 2017, 5, 1700416.10.1002/adom.201700416. - DOI
    1. Ding H.; Wei J.-S.; Zhang P.; Zhou Z.-Y.; Gao Q.-Y.; Xiong H.-M. Solvent-Controlled Synthesis of Highly Luminescent Carbon Dots with a Wide Color Gamut and Narrowed Emission Peak Widths. Small 2018, 14, 1800612.10.1002/smll.201800612. - DOI - PubMed
    1. Ding X. G.; Peng F.; Zhou J.; Gong W. B.; Slaven G.; Loh K. P.; Lim C. T.; Leong D. T. Defect engineered bioactive transition metals dichalcogenides quantum dots. Nat. Commun. 2019, 10, 41.10.1038/s41467-018-07835-1. - DOI - PMC - PubMed
    1. Guo L.; Ge J.; Liu W.; Niu G.; Jia Q.; Wang H.; Wang P. Tunable multicolor carbon dots prepared from well-defined polythiophene derivatives and their emission mechanism. Nanoscale 2016, 8, 729–734. 10.1039/C5NR07153D. - DOI - PubMed
    1. Ding H.; Yu S.-B.; Wei J.-S.; Xiong H.-M. Full-Color Light-Emitting Carbon Dots with a Surface-State-Controlled Luminescence Mechanism. ACS Nano 2016, 10, 484–491. 10.1021/acsnano.5b05406. - DOI - PubMed

LinkOut - more resources