title: Influence of Imidazole and Bis(trichlorophenyl) Oxalate in the Oxalyldiimidazole Peroxyoxalate Chemiluminescence Reaction.
abstract: The complex role of imidazole when used as a catalyst in the bis(2,4,6-trichlorophenyl) oxalate (TCPO) peroxyoxalate chemiluminescence (PO-CL) reaction is explained by the transient formation and subsequent degradation of 1,1'-oxalyldiimidazole (ODI). When ODI was used directly as PO-CL reagent, the stability was improved by addition of TCPO as an "imidazole sponge", since ODI is rapidly decomposed in the presence of imidazole. In this way, the imidazole-catalyzed degradation of ODI was hindered efficiently. The stability of ODI was also influenced by the storage vessel material. Polymeric bottles were found to be more suitable than glass containers. A comparison was made between the traditionally used reagent TCPO/imidazole (mixed on-line for formation of ODI) and the new reagent combination ODI-TCPO (premixed) with respect to sensitivity, noise, and background.
authors.affiliation: Department of Analytical Chemistry, Umeå University, S-901 87 Umeå, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Pontén
authors.forename: K
authors.initials: K
authors.lastname: Irgum