Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The superoxo complex [Co(CN) 5 O 2 ] 3- was found to act as a reducing agent towards quinones. One-electron reduction took place with -quinones whereas two-electrons reduction with -quinones. 3,5-Di- -butyl- -benzoquinone gave the corresponding semiquinone ...