New metallomesogens with enaminoketonato ligands

Bidentate and Tetradentate β‐Aminovinyl Trifluoromethylated Ketones and Their Copper(II) Complexes: Synthesis, Characterization and Redox Chemistry

“…For L1H, an intense band is observed at 355 nm, and one at 356 nm is observed for [Cu(L1) 2 ]. This absorption is typical of the different π-π* transitions of the phenyl ring and the enaminone moiety.…”

“…To a solution of 7 or 8 (0.66 mmol) in acetonitrile (3 mL) was added dropwise a solution of the diamine (0.33 mmol) in acetonitrile (3 mL) over 3 h. The mixture was then stirred at room temperature for 1 h. The precipitate formed was washed with cold acetonitrile, the filtrate evaporated to dryness, and the crude product was purified by silica gel chromatography (DCM for L8H 2 and L11H 2 , PE/DCM = 1:1 for L9H 2 , L10H 2 , L12H 2 and L13H 2 ). program.…”

“…[1] The ability of enaminones to coordinate to a variety of transition metals has led to the preparation of a number of metallomesogens with interesting liquid crystal properties [2][3][4][5] and highly active catalysts for olefin polymerization, which include fluorinated enaminones. [6][7][8] β-Aminovinyl ketones with a fluoroalkyl moiety are interesting organic precursors that can be decorated in a number of useful synthetic sequences to produce diverse molecular entities with specific applications.…”

“…The mixture was stirred at room temperature for 5 h. The solvent was removed under reduced pressure and the crude product was purified by silica gel chromatography (PE/DCM = 1:1). -2-yl)-1,1,1-trifluoro-4-[4-{(E) (3Z,3ЈZ)-4,4Ј-[Ethane-1,2-diylbis(azanediyl)]bis[4-(anthracen-2-yl)-1,1,1-trifluorobut-3-en-2 (3Z,3ЈZ)-4,4Ј-[1,2-Phenylenebis(azanediyl)]bis[4-(anthracen-2-yl)-1,1,1-trifluorobut-3-en-2 -2-yl)-1,1,1-trifluorobut-3-en-2 2 and L13H 2 ). The resulting mixture was stirred at room temperature for 2 h. Evaporation of the solvent under reduced pressure left a precipitate, which was collected by filtration and washed with cold MeOH to give the complex as a green or brown powder.…”

“…The resulting mixture was stirred at room temperature for 2 h. Evaporation of the solvent under reduced pressure left a precipitate, which was collected by filtration and washed with cold MeOH to give the complex as a green or brown powder. For L8H 2 and L9H 2 , evaporation of the MeOH followed by filtration through a short column of silica gel (DCM) was needed to give complexes in high purity. Single crystals suitable for X-ray characterization were obtained by slow evaporation of a DCM/MeOH (1:1) solution.…”