Homoleptische Metallorganische Innerkomplexe durch Orthometallierung. Tris(1‐phenyrazolato‐N,C^2′)‐und Tris(2‐phenylpyridinato‐N,C^2′)metall(III)‐Komplexe des Chroms und Cobalts

Abstract

Homoleptische metallorganische Innerkomplexe von 3d‐Elementen konnten erstmals auch durch Orthometallierung dargestellt werden. Es wird die Synthese und Charakterisierung von Cr(ppz)3 (ppz = 2′‐Anion des N‐Phenylpyrazols), Cr(ppy)3 (ppy = 2′‐Anion des 2‐Phenylpyridins), Co(ppz)3 und der neuen Verbindung Co(ppy)3 durch Orthometallierung von N‐Phenylpyrazol und 2‐Phenylpyridin mit CrPh3 · 3 THF und MgCoMes3Br · 5 THF beschrieben.

Organometallic Complexes as Hole-Transporting Materials in Organic Light-Emitting Diodes

“…The synthesis of fac -Co(ppz) 3 involved the reaction of anhydrous CoCl 2 with (2-pyrazolylphenyl)magnesium bromide, ppzMgBr, which gave fac- Co(ppz) 3 as well as a number of side products. , The 1-phenylpyrazolyl Grignard reagent was prepared by orthometalating 1-phenylpyrazole (ppzH) with ethylmagnesium bromide. The fac -Co(ppy) 3 complex was prepared by a method involving cyclometalation of 2-phenylpyridine (ppyH) with the reactive MgCo(mesitylene) 3 Br reagent . Here, the three mesitylene anions assist in the cyclometalation reaction of the incoming ligand precursors.…”

“…Synthesis of Tris(1-phenylpyridinato- N , C 2 ‘ )cobalt(III) [ fac -Co(ppy) 3 ]. Magnesium turnings (0.31 g, 12.8 mmol), bromomesitylene (2.50 g, 12.6 mmol), THF (15.0 mL), and a drop of dibromoethane were combined and refluxed gently under argon atmosphere until the magnesium was consumed. The solution was cooled to ca.…”

The overlooked NIR luminescence of Cr(ppy)3

“…8,9 Cr(ppy) 3 was first prepared in 1967 by treating CrCl 3 x3THF with 2-( ortho -lithiophenyl)pyridine 24 and later (1991) by treating CrPh 3 (thf) 3 25 with 2-phenylpyridine. 26 Despite its existence for decades, neither the stereochemistry, nor emission properties of Cr(ppy) 3 were reported. 24,26…”

“…26 Despite its existence for decades, neither the stereochemistry, nor emission properties of Cr(ppy) 3 were reported. 24,26…”