Bis{bis­[1-meth­oxy-2-(2-meth­oxy­eth­oxy)ethane-κ(3) O,O′,O′′]sodium} 1,1,2,2-tetra­phenyl­ethane-1,2-diide

Crystals of the title salt, [Na(C(6)H(14)O(3))(2)](2)(C(26)H(20)), were grown from a tetra­hydro­furan/diglyme/Et(2)O solvent mixture [diglyme is 1-meth­oxy-2-(2-meth­oxy­eth­oxy)ethane]. The cations and dianion are separated in the crystal structure, unlike in the other three structurally characterized dialkali metal tetra­phenyl­ethyl­ene salts. The asymmetric unit contains one [Na(diglyme)(2)](+) cation and one half of the [Ph(2)CCPh(2)](2−) dianion. The latter lies on a twofold rotation axis. C—C bond-length redistribution displays that excessive electron density of the dianion is predominantly located at the C atoms of a former double bond and at all eight ortho positions. The studied crystal was a twin, with the ratio of two major components being 0.2143 (9):0.7857 (9). The twin operation is a twofold rotation around the a axis.