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SUMMARY:T-Shaped Transition Metal Complexes and their Metalloradical Natur
 e - Prof. Lutz Gade\, Heidelberg University
DTSTART:20230215T150000Z
DTEND:20230215T160000Z
UID:TALK197197@talks.cam.ac.uk
CONTACT:Sharon Connor
DESCRIPTION:Abstract: Low-valent\, low coordinate transition metal complex
 es represent a class of extraordinarily reactive compounds that can act as
  reagents and catalysts for challenging bond-activation reactions. The pur
 suit of these electron-deficient metal complexes in low oxidation states d
 emands ancillary ligands capable of providing not only energetic stabiliza
 tion but also sufficiently high steric bulk at the metal center. In a T-sh
 aped geometry\, the transition metal complexes possess a precisely defined
  vacant coordination site which\, combined with the often observed high-sp
 in electron configuration\, exhibits unusually high selectivity of these c
 ompounds with respect to one-electron redox chemistry. In light of the int
 ractable reaction pathways typically observed with related electronically 
 unsaturated 3d transition metal complexes\, the pincer coordination mode e
 nables the isolation of low-valent compounds with more controlled and uniq
 ue reactivity. We have investigated a series of T-shaped metal(I) complexe
 s which may be regarded as ‘metalloradicals’ due to their selectively 
 exposed unpaired electrons.1 The focus of the lecture will be the elucidat
 ion of structures and reactive patterns observed for such highly unsaturat
 ed complexes as well as catalytic reaction mechanisms. The identification 
 and characterization of the paramagnetic species involved by NMR spectrosc
 opy will be discussed.2\nReferences\n1. J. C. Ott\, D. Bürgy\, H. Guan\,
  L. H. Gade\, Acc. Chem. Res. 2022\, 55\, 857.\n2. J. C. Ott\, H. Wadepohl
 \, M. Enders\, L. H. Gade\, J. Am. Chem. Soc. 2018\, 140\, 17413\; L. S. M
 erz\, C. K. Blasius\, H. Wadepohl\, L. H. Gade\, Inorg. Chem. 2019\, 58\, 
 6102\; J. C. Ott\, H. Wadepohl\, L.H. Gade\, Angew. Chem. Int. Ed. 2020\, 
 59\, 9448. J. C. Ott\, E. A. Suturina\, I. Kuprov\, J. Nehrkorn\, A. Schne
 gg\, M. Enders\, L. H. Gade\, Angew. Chem. Int. Ed. 2021\, 60\, 22856.
LOCATION:Dept of Chemistry\, Wolfson Lecture Theatre 
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