请问radical anions的中文意思是什么?

请问radical anions的中文意思是什么?
Later，many publications reported the synthesis of so-called irongraphite compounds by reducing FeCl3-GIC with different reducing agents，namely hydrogen，alkali metals，NaBH4，LiAlH4，n-BuLi，radical anions (Li-diphenylide，K-naphthalenide) in aprotic solvents，and electrochemical reduction 请问这两种解释哪种放在这句话中更合适啊？