The semiquinone radical anion of 1,10-phenanthroline-5,6-dione: synthesis and rare earth coordination chemistry

Abstract

Reduction of 1,10-phenanthroline-5,6-dione (pd) with CoCp^R₂ resulted in the first molecular compounds of the pd˙⁻ semi-quinone radical anion, [CoCp^R₂]⁺[pd]˙⁻ (R = H, (1); R = Me₄, (2)). Furthermore compounds 1 and 2 were reacted with [Y(hfac)₃(thf)₂] (hfac = 1,1,1-5,5,5-hexafluoroacetylacetonate) to synthesise the rare earth-transition metal heterometallic compounds, [CoCp^R₂]⁺[Y(hfac)₃(N,N′-pd)]˙⁻ (R = H, (3); R = Me₄, (4)).