Designing promising ultraviolet (UV) birefringent crystals with different hydrogen-bonded phosphate frameworks

From (C 6 H 7 N 2 O) + (H 2 PO 4 ) − to (C 6 H 6 NO 2 ) + (H 2 PO 4 ) − : different preparation methods resulting in tuning the inorganic framework and outstanding birefringence in organic phosphates.