EPR studies on carboxylic esters. Part 16. Indirect�generation of the elusive radical anions of alkyl �anthracene-9-carboxylates

EPR Studies on Carboxylic Esters. Part 17.1 EPR Spectra and Spin Densities in the Radical Anions of Thio and Dithiocoumarins

“…This system exhibits the reproducible potential of the Ag/Ag + /AgBr/Brchain in the solvent supporting electrolyte (ΔE = -520 mV vs the SCE) 5 and is also very suitable for the in situ generation of radical anions. 1,5,6 The reduction potentials E 1/2 of the thiocarbonyl derivatives 4-7 are shifted in the positive direction as compared with E 1/2 of the carbonyl derivatives 1-3. This is not unexpected since the former can be considered as cyclic thiono and dithioesters whereas the carbonyl derivatives represent ester and thiolester type compounds.…”

“…The EPR spectra were recorded, in general at room temperature, on a Bruker 420s spectrometer (X-band). 1,5,6,7 The g-factors were calibrated against the perylene radical cation (g = 2.002564). 20 HMO calculations were performed by use of the online program SHMO.…”