MECHANISM OF ACTIVATION AND CATALYSIS OF CHEMILUMINESCENCE BY Eu(fod)3 CHELATE IN THERMAL DECOMPOSITION OF ADAMANTYLIDENEADAMANTANE-1,2-DIOXETANE

Article abstract of DOI:10.1007/BF00864527

Complexation of the chelate both with dioxetane and with adamantanone (2), the product of decomposition of dioxetane, have an important effect on chemiluminescence (CL) in thermal decomposition of adamantylideneadamantane-1,2-dioxetane (1) in the presence of Eu(fod)3 chelate.The stability constants of Eu(fod)3*1 and Eu(fod)3*2 complexes were obtained.It was found that Eu(fod)3 catalyzes and activates chemiluminescent decomposition of 1.The rate constant (k₂) of decomposition of the Eu(III)*1 complex was determined from the kinetics of quenching of CL, and the activation parameters were determined from the temperature curve.Luminescence from the ⁵D_1- level of the Eu(III) ion was detected in the CL spectrum and was correlated with direct (bypassing the triplet of the ligand) transfer of excitation energy from 2_t* to the luminescent levels of Eu(III) in the geometrically distorted complex Eu(fod)3*2. Keywords: chemiluminescence, adamantylideneadamantane-1,2-dioxetane, Eu(fod)3, catalysis.