Metalloradical Compounds with 1,2-Dipivaloylhydrazido Ligands: Electron Transfer and Alkylation/Protonation Effects. European Journal of Inorganic Chemistry, (2019)21:2639--2647, 2019. [PUMA: alkylation calcn complex complex;spectroelectrochem crystal dipivaloylhydrazido effect mol osmium prepn protonation ruthenium structure structure;electron transfer]