Synthesis, characterization and catalytic behavior in the Suzuki reaction of Schiff base and its complexes and the optical properties of nickel complex used in the fabrication of a photodiode

Schiff base ligand N,N′-bis(2-hydroxy-1-naphtaldehydene)-1,4-bis(o-amino phenilthio)butane (L) derived from 2-hydroxy-1-naphthaldehyde and 1,4-bis(o-amino thiophenol)butane was synthesized and characterized by FTIR-ATR, 1H NMR, MS, TGA/DTA, elemental analysis, UV–Vis Spectroscopy. The reactions of the ligand with different transition metal(II) salts under reflux system condition afforded a series of metal complexes such as Cu(II), Co(III), Ni(II), Pd(II). Palladium-catalyzed Suzuki cross-coupling reactions employing Schiff-base as ligand toward a various of substituted arylbromides and boronic acids were pursued. The conversions obtained and yields with different arylbromides were calculated and summarized. ansmission and absorbance spectra of the Ni(II) complex were taken by UV–Vis spectrophotometer, and direct and indirect band gap values were determined by optical method. A photodiode was fabricated by forming a thin film on n-Si wafer and evaporating Au contact onto the film. It was seen that the structure has a good rectification. The electrical properties of the diode were calculated using current–voltage measurements. Furthermore, the effect of light on current–voltage measurements of the structure was examined using a solar simulator with AM1.5 filter at various illumination intensities.