. 2019 Apr 18;24(8):1533. doi: 10.3390/molecules24081533
© 2019 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Figure 2.
Examples of metal-free photoredox catalysts.