Na11B21O36X2 (X = Cl, Br): halogen sodium borates with a new graphene-like borate double layer

Abstract

Borate not graphene: The [B6O12]∞(6-) single borate layer is a graphene-like layer (see figure). The weak Na(+)-Br(Cl)(-) ionic connection between the layers leads to the layer cleavage, and difficulty of the block crystal growth.