TY - JOUR ID - 10329 TI - Spectrophotometric Study of Cobalt, Nickel, Copper, Zinc and Lead Complexes with Methylthymol Blue in Binary Water-Methanol Mixtures JO - Iranian Journal of Chemistry and Chemical Engineering JA - IJCCE LA - en SN - 1021-9986 AU - Ghavami, Raoof AU - Abdollahi, Hamid AU - Saleem Khan, Mohammad AD - Department of Chemistry, Shiraz University, Zip code 71454, Shiraz, I.R. IRAN AD - Department of Chemistry, Razi University, Zip code 67145, Kermanshah, I.R. IRAN Y1 - 1997 PY - 1997 VL - 16 IS - 1 SP - 22 EP - 28 KW - MTB complexes KW - Stoichiometry KW - stability KW - Mixed solvent KW - Spectrophotometry DO - 10.30492/ijcce.1997.10329 N2 - The complexation reactions between methylthymol blue (MTB) and Co2+, Ni2+, Cu2+, Zn2+ and Pb2+ ions have been studied in different water-methanol mixtures at pH 4.45 and 25 °C by a spectrophotometric technique. The stepwise stability constants of the resulting 1:1 and 2:1 (metal ion to ligand) complexes were determined from the absorbance-mole ratio data. It was found that the overall stability constants of the complexes formed increase in the order Zn2+