Synthesis and Characterization of Dioxomolybdenum(VI) Complexes with Tridentate O,N,S-Donor Schiff Bases and 4,4'-Bipyridyl Ligand

강혜승 • 임우택 • 구본권 Scheme 1.The tautomerism of Schiff base ligands.solid samples in ATR method were recorded on a JASCO FT-IR 4100 type A. The 1H-NMR spectra in DMSO-d were recorded on a Varian AS 400 MHz spectrometer and referenced to TMS (inter nal).Electronic spectra were obtained on a Milton Roy Genesys 2 UV/Vis.spectrophotometer.TG anal ysis was performed on a Shimadzu DTG-60 instru ment with a heating rate of 10 oC min-1.[MoO(sal-mdtc)(CHOH)](4,4'-bpy) (1).The reaction mixture of MoOJacac) (0.68 mmol, 0.223 g) and sal-mdtcH (0.68 mmol, 0.153 g) in methanol solution (15 mL) was refluxed for 2 h.and to the solution was added 4,4'-bpy (0.68 mmol, 0.106 g) with stirring.The mixture was further refluxed for another 1 h.and filtered.The filtrate was left in ambi ent temperature for several days.The reddish crystals suitable for X-ray diffraction were isolated in 4.6% (0.017 g) yield.Anal.Calcd.for Q0H0NOSMo: C, 44.