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SUMMARY:Confined Electron Transfer for Premium  Photocatalysis within Meta
 l-Organic Architectures - Prof Chunying Duan (Dalian University of Technol
 ogy\, China)
DTSTART:20190809T100000Z
DTEND:20190809T110000Z
UID:TALK128650@talks.cam.ac.uk
CONTACT:Lingtao Kong
DESCRIPTION:Through incorporation of electron transfer pairs in both the g
 round and excited states into redox active Werner type hosts with electron
 ic acceptor/donor guests\, the Duan group has developed a promising method
  to mimic natural enzyme systems in terms of redox transformations within 
 a confined microenvironment. The host-guest systems fix and isolate the do
 nor-acceptor pair with a short through-space separation\, and without a th
 rough-bond electron transfer pathway. The confined electron transfer behav
 ior differed from both the classical inter- or intramolecular photoinduced
  electron transfer (PET) processes that obey the Rehm-Weller or the Marcus
  theory. It has been proposed that this new electron transfer behavior ass
 ists in the stabilization of the charge-separated pair\, which promotes re
 dox transformations in both the ground and excited states. The unique comm
 unication between the dye guest and the host is direct confined PET from t
 he excited state of the dye to the host\, which could provide meaningful i
 nsight into the secrets of substance and energy metabolism in biological s
 ystems. Through modulation of the active site of nicotinamide adenine dinu
 cleotide (NADH) models\, the redox-active molecular host facilitated the c
 onfined electron transfer from the active sites of the NADH models to the 
 substrate for biomimetic hydrogenation in the inner space of the host. The
  host-guest chemistry within the dye-containing metal-organic hosts permit
 ted additional thermodynamic activation and modification of the electron t
 ransfer route for chemical reactions. The regiospecific and stereospecific
  PET processes within the host are at an early stage of development\, howe
 ver they have already proved important in the forging of organic reactions
  with tandem steps or intrinsic selectivity. By incorporating the oxidatio
 n catalyst and the aforementioned chiral group into one framework\, an amp
 hipathic framework-based host prompted the asymmetric dihydroxylation of a
 ryl olefins. \n\nRef.\n\n[1] X. Jing\, C. He\, L. Zhao\, C. Duan\,* Acc. C
 hem. Res.\, 2019\, 52\, 100.\n\n[2] T. Zhang\, Y. Jin\, Y. Shi\, M. Li\, J
 . Li\, C. Duan\,* Coordin. Chem. Rev.\, 2019\, 380\, 201.\n\n[3] T. Zhang\
 , X. Guo\, Y. Shi\, C. He\, C. Duan\,* Nat. Commun.\, 2018\, 9\, 4024.\n\n
 [4] X. Jing\, C. He\, Y. Yang\, C. Duan\,* J. Am. Chem. Soc.\, 2015\, 137\
 , 3967.\n\n[5] L. Zhao\, J. Wei\, J. Lu\, C. He\, C. Duan\,* Angew. Chem. 
 Int. Ed.\, 2017\, 56\, 8692.\n\n[6] P. Wu\, C. He\, J. Wang\, X. Peng\, X.
  Li\, Y. An\, C. Duan\,* J. Am. Chem. Soc.\, 2012\, 134\, 14991.\n\n[7] Z.
  Xia\, C. He\, X. Wang\, X. C. Duan\,* Nat. Commun.\, 2017\, 8\, 361.\n\n[
 8] Q. Han\, C. He\, M. Zhao\, B. Qi\, J. Niu\, C. Duan\,* J. Am. Chem. Soc
 .\, 2013\, 135\, 10186.\n
LOCATION:PfizerLecture Theatre\,  Department of Chemistry\, Lensfield Road
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