Evaluasi Pengelolaan Limbah Padat B3 Fasilitas Puskesmas di Kabupaten Sidoarjo

Abstract

Newly discovered N-heterocyclic carbene-boryl radicals (NHC-BH2.) derived from readily available N-heterocyclic carbene-boranes are found to be efficient initiators for acrylate photopolymn. Laser flash photolysis (LFP) expts. were used to generate three carbene-boryl radicals, which were characterized by their transient absorption spectra with the aid of DFT calcns. Rate consts. were measured for the generation of the carbene-boryl radicals by hydrogen abstraction with tert-butoxyl radical, a ketophosphonyl radical, and triplet benzophenone. Rate consts. were also measured for the reactions of the carbene-boryl radicals with oxygen, three alkenes, two alkyl chlorides, and diphenyliodonium hexafluorophosphate. The obsd. trends were interpreted with the aid of measured oxidn. potentials of the carbene-boranes and calcd. ionization potentials of the carbene-boryls. N-Heterocyclic carbene-boranes show excellent potential as both photopolymn. co-initiators and mediators of small mol. radical reactions, and these results will help guide further development in both fields.