Cover Feature: Pincer‐Type Mesoionic Carbene Nickel(II) Complexes: Synthesis, Properties, Reactions, and Catalytic Application to the Suzuki–Miyaura Coupling Reaction of Aryl Bromides (Eur. J. Inorg. Chem. 10/2022)

Abstract

The Cover Feature shows an image of the final product of an elaborately designed pincer complex derived from triazolylidene, which has emerged through a long series of steps from the earth′s abundant nickel mines. The complex has interesting properties provided by the ligand with strong σ‐donor and π‐acceptor abilities, and bulky substituents. It is also active in the Suzuki‐Miyaura coupling of aryl bromides. The crystals are called annabergite and are known to be a landmark in nickel mining. Like this crystal, the complex is expected to become one of the landmarks for the development of organonickel chemistry. More information can be found in the Research Article by K. Matsubara and co‐workers.

Application of first-row transition metal complexes bearing 1,2,3-triazolylidene ligands in catalysis and beyond

“…Reaction of the ditriazolium pincer ligand precursor L8 (R = Dipp, Mes; X = BF 4 ) with Ag 2 O and subsequently with [NiCl 2 (dme)] yields the air-stable monocationic nickel complex Ni12 (dme = 1,2-dimethoxyethane; Scheme 37). 122,123 Despite the formally cationic nickel center, the metal-bound chloride is readily abstracted upon reaction with AgBF 4 to yield the dicationic nickel solvento complex Ni13, which is however unstable under aerobic conditions. The Ni-C trz bond lengths in Ni12 are 1.905(2) and 1.909(2) Å and thus shorter than in the carbazole pincer complex Ni11.…”