Complex formation of molybdenum (V) with 1-phenyl-2,3-dimethylpyrazoline-5-thion in 4 mol/L HCI medium at 273-338 K

The process of complexation molybdenum (V) with 1-phenyl-2,3-dimethylpyrazolin-5-thione in a 4 mol/l HCI medium the temperature range 273-338 K was studied by potentiometric method. It has been shown that reduced form molecule is involved complex formation reaction. Using data studies, change energy value (ΔE) (NH ) 2 [MoOCI 5 ] -1-phenyl-2,3-dimethylpyrazolin-5-thione-4 HCl system, equilibrium concentrations 1-phenyl-2,3-dimethylpyrazolin-5-thione, function values, step and general stability constants oxochloro-1-phenyl-2,3-dimethylpyrazolin-5-thione complexes formed solutions K. were refined using Bjerrum graphical coefficient method used to estimate thermodynamic functions processes (NH4)2[MoOCI5]-1-phenyl-2,3-dimethylpyrazolin-5-thione - mol/L system. domains dominance maximum yield each are found. established system ]-1-phenyl-2,3-dimethylpyrazolin-5-thione during interaction MoO 3+ ion 1-phenyl-2,3-dimethylpyrazolin- 5-thione entire experiment forms mononuclear coordination compounds containing from one five coordinated molecules organic ligand. found increasing temperature, values decrease, which confirms exothermicity reaction oxochloro-1-phenyl-2,3-dimethylpyrazoline-5-thione (V). experimentally enthalpy made it possible assume between nitrogen- sulfur-containing heterocyclic proceeded exothermically spontaneously. Based on above equations, all calculations carried out computer Excel programming language, Borland Delphi, Windows 7 operating