Issue 43, 2020

Chelated Fischer carbene complexes of annulated thiophenes: synthesis, structure and electrochemistry

Abstract

Two (thieno[3,2-b]thiophene) and three annulated thiophenes (dithieno[2,3-b;3′,2′-d]thiophene and dithieno[3,2-b;2′,3′-d]thiophene) were employed as building blocks to synthesize linear or semi-circular chelated mononuclear biscarbene and dinuclear tetracarbene complexes. The electronic properties of the annulated thienylene chelated carbene complexes were investigated by cyclic voltammetry experiments and compared to non-chelated Fischer-type monocarbene complexes. Density functional theory (DFT) calculations were used to assign the redox events and to probe the extent of electron delocalisation as well as the possibility of electronic (intramolecular metal–metal) communication as a result of intervalence. The differences of these electronic properties in the conjugated chelated carbene complexes are compared to chelated carbene compounds without a linear conjugated pathway.

Graphical abstract: Chelated Fischer carbene complexes of annulated thiophenes: synthesis, structure and electrochemistry

Supplementary files

Article information

Article type
Paper
Submitted
22 Sep 2020
Accepted
19 Oct 2020
First published
23 Oct 2020
This article is Open Access
Creative Commons BY license

Dalton Trans., 2020,49, 15339-15354

Chelated Fischer carbene complexes of annulated thiophenes: synthesis, structure and electrochemistry

Z. Lamprecht, F. P. Malan, I. Fernández, S. Lotz and D. I. Bezuidenhout, Dalton Trans., 2020, 49, 15339 DOI: 10.1039/D0DT03298K

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