- A Nanocrystal Catalyst Incorporating a Surface Bound Transition Metal to Induce Photocatalytic Sequential Electron Transfer Events
-
Heterogeneous photocatalysis is less common but can provide unique avenues for inducing novel chemical transformations and can also be utilized for energy transductions, i.e., the energy in the photons can be captured in chemical bonds. Here, we developed a novel heterogeneous photocatalytic system that employs a lead-halide perovskite nanocrystal (NC) to capture photons and direct photogenerated holes to a surface bound transition metal Cu-site, resulting in a N-N heterocyclization reaction. The reaction starts from surface coordinated diamine substrates and requires two subsequent photo-oxidation events per reaction cycle. We establish a photocatalytic pathway that incorporates sequential inner sphere electron transfer events, photons absorbed by the NC generate holes that are sequentially funneled to the Cu-surface site to perform the reaction. The photocatalyst is readily prepared via a controlled cation-exchange reaction and provides new opportunities in photodriven heterogeneous catalysis.
- Beard, Matthew C.,Chen, Xihan,Han, Chuang,Lin, Yixiong,Martin, Jovan San,Miller, Collin,Wang, Xiaoming,Yamamoto, Nobuyuki,Yan, Yanfa,Yan, Yong,Yazdi, Sadegh,Zeng, Xianghua
-
supporting information
p. 11361 - 11369
(2021/08/16)
-
- Synthesis and antitubercular activity of lipophilic moxifloxacin and gatifloxacin derivatives
-
Fluoroquinolone (FQ) has a broad spectrum of activity against several bacteria, mycobacteria, parasites, and other diseases. Moxifloxacin and gatifloxacin are a new generation of fluoroquinolone agents with improved activity against Gram-negative and positive bacteria. As lipophilicity is an important consideration in the design and activity of novel antibacterial agents, we report in this work the synthesis and biological evaluation of 12 lipophilic moxifloxacin or gatifloxacin derivatives, by reaction of 1-cyclopropyl-6,7-difluoro-1,4-dihydro-8-methoxy-4-oxoquinoline-3-carboxylic acid 13 with severals N-monoalkyl 1,2-ethanediamine or 1,3-propanediamine.
- de Almeida, Mauro V.,Saraiva, Mauricio F.,de Souza, Marcus V.N.,da Costa, Cristiane F.,Vicente, Felipe R.C.,Lourenco, Maria C.S.
-
p. 5661 - 5664
(2008/03/14)
-