. "The method according to claim 1, wherein the heterocyclic compound is a compound represented by the formula (I): wherein R1 is a group capable of forming an anion or a group capable of being converted into such a group, X denotes that a phenylene group and a phenyl group are bound directly or through a spacer having 2 or less of atomic chains, n is an integer of 1 or 2, ring A is a further optiona" . . .