Abstract
Two new indium iodate-nitrates, In(IO3)2(NO3) (1) and [In(IO3)(OH)(H2O)](NO3) (2), were rationally designed through the integration of hybrid anionic functional units. They exhibit large birefringences (1, 0.269; 2, 0.188, at 532 nm) and wide band gaps (1, 4.08 eV; 2, 4.39 eV), which is attributed to the synergistic effect of two types of birefringence-active units, namely, lone-pair IO3 and π-conjugated NO3 anionic groups. Through the substitution of OH and H2O of 2 with IO3, the hydrogen bonds of 2 are eliminated and the birefringence of 1 is greatly enhanced, highlighting the intriguing role of isovalent substitution in the discovery of fascinating optical materials.
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