Zhaowen Dong

Biographie

04/2019 – now | Postdoctoral Research Fellow École Polytechnique Fédérale de Lausanne (EPFL), Switzerland Supervisor: Prof. Dr. Kay Severin 01/2019 – 03/2019 | Postdoctoral Research Fellow Carl von Ossietzky Universität Oldenburg, Institute of Chemistry, Germany Supervisor: Prof. Dr. Thomas Müller 07/2015 – 12/2018 | Ph.D. in Inorganic Chemistry (Summa Cum Laude) Carl von Ossietzky Universität Oldenburg, Institute of Chemistry, Germany Supervisor: Prof. Dr. Thomas Müller

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https://people.epfl.ch/zhaowen.dong?lang=fr

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The head-to-tail dimerization of N-heterocyclic diazoolefins is described. The products of these formal (3+3) cycloaddition reactions are strongly reducing quinoidal tetrazines. Oxidation of the tetrazines occurs in a stepwise fashion, and we were able to isolate a stable radical cation and diamagnetic dications. The latter are also accessible by oxidative dimerization of diazoolefins.

2023

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Bent (hetero)allenes such as carbodicarbenes and carbodiphosphoranes can act as neutral C-donor ligands, and diverse applications in coordination chemistry have been reported. N-Heterocyclic diazoolefins are heterocumulenes, which can function in a similar fashion as L-type ligands. Herein, we describe the synthesis and the reactivity of an anionic diazoolefin. This compound displays distinct reactivity compared to neutral diazoolefins, as evidenced by the preparation of diazo compounds via protonation, alkylation, or silylation. The anionic diazoolefin can be employed as an ambidentate, X-type ligand in salt metathesis reactions with metal halide complexes. Extrusion of dinitrogen was observed in a reaction with PCl(NiPr2)2, resulting in a stable phosphinocarbene.

2023

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A Mesoionic Diselenolene Anion and the Corresponding Radical Dianion

Cesare Berton, Zhaowen Dong, Farzaneh Fadaei Tirani, Rosario Scopelliti, Kay Severin, Andrzej Sienkiewicz, Abdusalom Suleymanov

Dichalcogenolenes are archetypal redox non-innocent ligands with numerous applications. Herein, we describe a diselenolene ligand with fundamentally different electronic properties. By selenation of a C2-protected imidazolium salt, we have prepared a mesoionic diselenolene. This ligand is diamagnetic, which is in contrast to the paramagnetic nature of standard dichalcogenolene monoanions. The new ligand is also redox-active, as demonstrated by isolation of a stable diselenolene radical dianion. The unique electronic properties of the new ligand give rise to unusual coordination chemistry. Thus, we were able to prepare a hexa-coordinate aluminum tris(diselenolene) complex, and a Lewis acidic aluminate complex with two ligand-centered unpaired electrons.

2022

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