No abstract

The reaction of meso -tetraphenylporphyrin with Mo(VI) oxide in boiling phenol resulted in a stable complex O=Mo(OH)TPP. Thermodynamics and kinetics of the reaction between (oxo)(hydroxo)molybdenumtetraphenyporphyrin with pyridine in toluene were studied by spectrophotometric method. This reaction was found to occur in three equilibrium elementary stages: replacement of OHby Py ( K 1 = 9.1 × 10 3 l/mol, k 1 = 5.25 s -1 mol -1 l), the formation of dication (dipyridine)(hydroxo)molybdenumtetraphenylporphyrin as a result of cleavage of a double bond Mo=O ( K 2 = 39.3 l/mol, k 2 = 1.83 × 10 -2 s -1 mol -1 l), and the formation of cationic complex [ Mo ( Py ) 3 TPP ] 3+ · 3 OH -( K 3 = 1.0 l/mol, k 3 = 1.19 × 10 -3 s -1 mol -1 l).