Key points are not available for this paper at this time.
C 8 H 6 IN 3 O 4 exhibits a substantial birefringence of 0.55 at 550 nm, surpassing commercially available birefringent materials, and this phenomenon is attributed to the uniform alignment of π-conjugated NO 3 − and C 8 H 6 IN 2 O + groups.
Chen et al. (Mon,) studied this question.