Parallel and compact alignments ofπ-conjugated anions in a crystal are of importance to maximize the optical anisotropy of crystalline materials.Our attempts to design colossal birefringence in metal hydroisocyanurat...Parallel and compact alignments ofπ-conjugated anions in a crystal are of importance to maximize the optical anisotropy of crystalline materials.Our attempts to design colossal birefringence in metal hydroisocyanurates M2N(H_(2)C_(3)N_(3)O_(3))4·6H_(2)O(M/N=Li/Ca and Na/Ba)were successful using cation coordination control.In particular,Li_(2)Ca(H_(2)C_(3)N_(3)O_(3))4·6H_(2)O(LCHCY)shows the largest birefringence(Δn=0.407@800 nm)among all the reported metal cyanurates and hydroisocyanurates,even larger than that of 2D BN layers,due to the reinforced lock effect of basal oxygens from LiO_(4)tetrahedra.LCHCY is a novel promising ultraviolet birefringent crystal with a short ultraviolet cut-off and a wide transmission range.展开更多
基金supported by the National Natural Science Foundation of China(51502307,51772304 and 51890864)the Institute of Chemical Materials,the China Academy of Engineering Physics(32203)+1 种基金the Youth Innovation Promotion Association of the Chinese Academy of Sciences(2018035)the Fujian Institute of Innovation,Chinese Academy of Sciences(FJCXY18030101).
文摘Parallel and compact alignments ofπ-conjugated anions in a crystal are of importance to maximize the optical anisotropy of crystalline materials.Our attempts to design colossal birefringence in metal hydroisocyanurates M2N(H_(2)C_(3)N_(3)O_(3))4·6H_(2)O(M/N=Li/Ca and Na/Ba)were successful using cation coordination control.In particular,Li_(2)Ca(H_(2)C_(3)N_(3)O_(3))4·6H_(2)O(LCHCY)shows the largest birefringence(Δn=0.407@800 nm)among all the reported metal cyanurates and hydroisocyanurates,even larger than that of 2D BN layers,due to the reinforced lock effect of basal oxygens from LiO_(4)tetrahedra.LCHCY is a novel promising ultraviolet birefringent crystal with a short ultraviolet cut-off and a wide transmission range.
