Complexes of 3d Metals with a Bulky Carbazolyl Ligand

Abstract

Dedicated to Prof. Cameron Jones on the occasion of his 60 th birthday.In this contribution, the synthesis and properties of nine novel 3d metal complexes are reported. As supporting ligand scaffold, the bulky 1,8-bis(3,5-ditertbutylphenyl)-3,6-ditertbutylcarbazole (R) was employed. After deprotonation and salt metathesis reactions, a series of four complexes, the dimeric [RMn(THF)(μ-Cl)] 2 (1 a), [RFe(THF)(μ-Cl)] 2 (2 a), and [RCo(THF)(μ-Cl)] 2 (3 a) as well as a monomeric [RCr(THF) 2 (Cl)] (4 a), were obtained, while the analogous Ni(II) complex remained elusive. However, incorporation of PMe 3 as stronger donor molecule in comparison sufficed to stabilise also the Ni(II) complex [RNi(PMe 3 ) 2 (Cl)] (5 b). The series was completed by treatment of 1 a-4 a with PMe 3 , which afforded the related phosphine complexes 1 b-4 b. All complexes were characterised in the solid state by single crystal structure elucidation and their magnetic moments in solution were determined by NMR experiments with the Evans method.

Efficient fluorescence of alkali metal carbazolides

“…28 In previous works, our group prepared the potassium carbazolide [( dtbp Cbz)K] (3a) by deprotonation of the ( dtbp Cbz)-H ligand with benzyl potassium. [29][30][31][32] It was noted that the compound is highly luminescent but at that time metathesis reactions were the focus of study. In order to gain detailed insight into the luminescence behaviour of the carbazolide entity and the influence of the coordinated group 1 element, two series of compounds were prepared: a) the unsolvated complexes [( dtbp Cbz)M], M = Li (1a), Na (2a), K (3a), Rb (4a), Cs (5a) and b) the toluene solvates [( dtbp Cbz)M(Tol) n ], M = Li (1b), Na (2b), K (3b), Rb (4b), Cs (5b).…”