Sulfur-empowered porous frameworks as sensors, semiconductors and catalysts

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Sulfur-empowered porous frameworks as sensors, semiconductors and catalysts

 

Zhengtao Xu

 

Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China

 

The story is one of closing the gaps, i.e., the insulating gap in metal-organicframeworks (MOFs), and the gap in the synthetic strategies for porous metal-thiolate solids; both critically relevant to next-generation electronic and catalytic materials. We recount the quest for recipes—the ones broadly effective for tackling the intractable metal-sulfur link in both network construction and in catalytic applications. In a simple, one-pot recipe, rigid, chelating aromatic thiols directly react with metal ions to formporous frameworks. The resultant metal-dithiolene nets inaugurate a class of covalent metal-organic frameworks (CMOF) that not only feature versatile electroactive and ion-exchange capabilities, but also bridge the two parallel fields of MOFs and porous polymers. In the hard-and-soft design, carboxyl and sulfur groups make for a versatile, stepwise approach: 1) hard ions like Zr(IV) selectively engages the carboxyl groups to set up the host net; 2) the dangling thiol donors can then take up metal guests to afford the metal-thiolate function which can be deployed either as electroactive cross-links for closing up the insulating gap in the solid state framework, or as solitary units with open metal sites for leach-free, bona fide heterogeneous catalysis.

 

ZhengtaoXu(徐政涛) is a Professor at City University of Hong Kong. He obtained BS from Peking University (1996), MS from University of Michigan at Ann Arbor (1998), and Ph.D. from Cornell University (2001). He was a postdoc with David B. Mitzi at IBM T. J. Watson Research Center from 2001-2003. Prior to moving his research program to CityU, Dr. Xu was a tenure-track assistant professor at the George Washington University (2003-2005). Dr. Xu has been awarded the PRF Starter Grant from the American Chemical Society (2004),the ORAU Ralph E. Powe Junior Faculty Enhancement Award (2004) and a Humboldt Research Fellowship for Experienced Researchers (2011; host: Prof. Markus Antonietti, MPI of Colloids and Interfaces, Potsdam). Our current work synergizes molecular syntheses and framework materials, i.e., porous polymer and metal-organic frameworks (MOF) for sensing, separation, catalysis and advanced optical/electronic applications.

salle E012 - ENS - 24 rue Lhomond

Vendredi 16 Juin 2017 10:00
Prof. XU Zhengtao
Séminaire du département
Unité de rattachement: 
FRE IMAP 2000