Phenol Based‐Ligands with Two Adjacent N,N′,O‐Binding Pockets

Abstract

The synthesis of three new ligands and their coordination behavior towards zinc ions with strongly coordinating anions and cobalt ions with weakly coordinating anions are reported. The ligands have two adjacent imidazolyl‐pyridinyl and pyrazolyl‐pyridinyl binding pockets, respectively, which are linked by a phenol unit. We also investigated the dynamic behavior of the ligand having the imidazolyl‐pyridiyl sidearm in solution. The reaction of the ligands and ZnCl2 yielded complexes of the type [LZn2Cl3]. When we used CoII salts with weakly coordinating anions, complexes of the general formula [L2Co2]2+ were formed.

Are Two Metal Ions Better than One? Mono‐ and Binuclear α‐Diimine‐Re(CO)3 Complexes with Proton‐Responsive Ligands in CO2 Reduction Catalysis

“…The synthesis and characterisation of 3 has been described previously . Ligands L 1 and L 2 can be synthesised in a multi‐step synthesis starting with 2,4‐di‐ tert ‐butylphenol (Figure S1, Supporting Information).…”

“…The synthesis and characterisation of 3 has been described previously. [11] Ligands L 1 and L 2 can be synthesised in am ultistep synthesis startingw ith 2,4-di-tert-butylphenol ( Figure S1, Supporting Information). The ligandsw ere purifiedb yr ecrystallization from ethanol and fully characterisedb yc ommon methods.…”

A dinuclear rhenium complex in the electrochemically driven homogeneous and heterogeneous H+/CO2-reduction

“…The pyrene group was introduced in the second to the last step in a coupling reaction between the boronic acid pyrene group and the ligand precursor with a bromo function in the backbone. This allows for minimum modification of the ligand synthesis 10 and maximum flexibility in the anchor group as it is introduced late in the synthesis. The pyridine-imidazole sidearm was prepared in a Negishi coupling reaction as described previously.…”

ADUC Prizes: A. Andrieu‐Brunsen, I. Siewert, and T. Magauer / Carl Duisberg Memorial Prize: F. R. Fischer / Honorary Membership of the Gesellschaft Deutscher Chemiker: D. Jahn / Windaus Medal and Herbert C. Brown Award: A. Fürstner / Gottfried Wilhelm Leibniz Prize: B. List / Rottendorf Prize: M. Pietsch / Seymour Schulich Lectureship Award: M. T. Reetz / Akademiepreis für Chemie: M. Schnell

“…Inke Siewert (University of Göttingen) was very recently featured here when she won the Ernst Haage Prize . Siewert's research interests involve the activation of small molecules by transition‐metal complexes, and she has recently reported in the Zeitschrift für anorganische und allgemeine Chemie on the coordination behavior of phenol‐based ligands, and in Angewandte Chemie on electrocatalytic dihydrogen production with a cobalt catalyst …”