Tuning electronic structure through halide modulation of mesoionic carbene cobalt complexes

Abstract

The first examples of Co(ii) mesoionic carbene complexes (CoX2DippMIC2; X = Cl−, Br−, I−) demonstrate a new electronic perturbation on tetrahedral Co(ii) complexes.

Chemistry of Compounds Based on 1,2,3-Triazolylidene-Type Mesoionic Carbenes

“…106 Recently, tetrahedral cobalt(II) complexes contain- ing two MIC ligands and two halides were investigated for their single-ion magnet properties. 107 The borate-based cobalt(II) complex 88 bearing a mesoionic 1,2,3-triazol-4-ylidene donor ligand has been demonstrated by Sarkar and co-workers very recently. The complex was synthesized from the corresponding borate-based triazolium salt 87 using the deprotonation with LDA followed by the addition of CoCl 2 (Scheme 18).…”

“… 106 Recently, tetrahedral cobalt(II) complexes containing two MIC ligands and two halides were investigated for their single-ion magnet properties. 107 …”

“…This Co III complex has been used as an excellent electrocatalyst for the reduction of protons to dihydrogen in organic medium . Recently, tetrahedral cobalt­(II) complexes containing two MIC ligands and two halides were investigated for their single-ion magnet properties …”

Isomerization Reactions in Anionic Mesoionic Carbene‐Borates and Control of Properties and Reactivities in the Resulting CoII Complexes through Agostic Interactions

“…[37][38][39][40][41][42] In the past decade,metal complexes of MICs were shown to display excellent properties,e .g. in homogeneous catalysis, [37][38][39][40][41][42][43] in redox switchable catalysis, [44][45][46] in magnetism, [47] and in photochemistry. [48][49][50][51][52][53][54][55][56][57] Despite this progress in the development of MICs,t he field is almost exclusively dominated by neutral MICs,e ven though there have been some recent examples of cationic MIC ligands.…”

Isomerisierungsreaktionen in anionischen mesoionischen Carbenboraten und Kontrolle der Eigenschaften und Reaktivität in den entstehenden CoII‐Komplexen durch agostische Wechselwirkungen

“…In den letzten zehn Jahren konnte immer wieder gezeigt werden, dass Metallkomplexe mit MICs hervorragende Eigenschaften aufweisen, unter anderem in der homogenen Katalyse, [37][38][39][40][41][42][43] in der redoxschaltbaren Katalyse, [44][45][46] im Magnetismus [47] und in der Photochemie. [48][49][50][51][52][53][54][55][56][57] Tr otz diverser Fortschritte bei der Entwicklung von MICs wird das Feld fast ausschließlich von neutralen MICs dominiert, obwohl es in jüngster Zeit einige Beispiele fürk ationische MIC-Liganden gegeben hat.…”