2,2′-[(1E,1′E)-1,2-Phenylenebis(azanylylidene)bis(methanylylidene)]bis(4-bromophenol)

Abstract

In the title compound, C20H14Br2N2O2, there are two intramolecular O—H...N hydrogen bonds formingS(6) ring motifs. The outer benzene rings are inclined to the central benzene ring by 39.09 (11) and 24.31 (11)°, and to one another by 37.12 (11)°. In the crystal, molecules are linked by a short Br...O contact [3.1307 (19) Å], forming zigzag chains propagating along thea-axis direction. The chains are linked by weak offset π–π interactions [intercentroid distance = 3.716 (1) Å], forming layers parallel to theacplane.

Mononuclear oxovanadium(IV) Schiff base complex: Synthesis, spectroscopy, electrochemistry, DFT calculation and catalytic activity

“…The C=N bond distances are 1.308( 7) Å (N1=C7) and 1.300( 7) Å (N2=C14), which are consistent with a slight elongation of the C=N double bond in the corresponding ligand [64,49].…”

“…The structure of the synthesized ligand is given by the following scheme: The azomethine proton appears at 8.54 ppm. Multiplet signal, due to the aromatic protons, are observed in the range 6.88-8.00 ppm [49 ].…”

“…The tetradentate Schiff base ligand, H2L, was synthesized according to the literature method [48,49] by condensing of 1 mmol (0.108g) of phenylenediamine with 2 mmol (0.402 g) of 5-Bromo salicylaldehyde in 15 ml of methanol .The bright orange solution was stirred and heated to reflux for 2 h under nitrogen atmosphere, scheme 1.…”