Cu (II)–LEUCINE COMPLEX AS HOMOGENEOUS CATALYST FOR CUMENE HIDROPEROXSIDE DECOMPOSITION IN AQUEOUS MEDIUM

Abstract

Making use spectroscopic, isomolar series and kinetic methods the complex formation between Cu(II) ion and leucine (Leu) in aqueous medium is studied. The formation of complex with L:M²⁺=1:1 relation is established, which in the studied system H₂O+Cu(II)+Leu+CHP acts as homogeneous catalyst resulting cumene hydroperoxide (CHP) decomposition. Kinetic regularities of hydroperoxide (ROOH) decomposition under the action of [Cu(II)Leu ] complex are studied. The reaction law is: W₀ = –d[ROOH]₀/dt=K_cat[Cu²⁺Leu]₀[ROOH]₀ = K_eff[ROOH]₀, where K_eff = K_cat[Cu²⁺Leu]₀. K_eff’s dependence on temperature is expressed by the following Arrhenius equation (the activation energy is expressed in J/mol): K_eff = (7.07 ± 0.05)10⁵exp[(–49400 ± 300)/RT], min^–1.