3 5 dichlorosalicylaldehyde

Ruthenium(III) chloride hydrate, lithium chloride, 2,2 ′ -bipyridyl, silver tetrafluoroborate, triethylamine, 5-bromosalicylaldehyde, 3,5-dibromosalicylaldehyde, 5-chlorosalicylaldehyde, 3,5dichlorosalicylaldehyde, and 3-bromo-5-chlorosalicylaldehyde were purchased from Sigma-Aldrich and used without purification. Ru(bpy) 2 Cl 2 was prepared according to the literature procedure. [53] [54] [55] The commercial solvents were distilled and then used for the preparation of ligands and complexes. The FT-IR spectrum was recorded on a JASCO, FT/IR-6300 spectrometer (4000-400 cm -1 ) in KBr pellets. Elemental analysis was performed on Leco, CHNS-932 and PerkinElmer 7300 DV elemental analyzers. 1 H-and 13 C-NMR spectra for the Ru(II) complexes were recorded on a Bruker Avance III 400 spectrometer using DMSO as the solvent at 20 °C.