;;mingxin GU;He Guotian ;;
. 2012, 43(16): 27-0.
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Ionic liquids, as novel "soft" functional materials have become a new hotspot in the research field at present. The research of the refractive index of ionic liquids is important to research structure properties on this new type of optical materials. In this paper, we selected series ionic liquids: [Cnmim]BF4 (n = 6,8,10,12), [Cnmim]PF6 (n = 8,10,12), [Cnmim]I (n = 7,8,10), [Cnmim]Cl (n = 10,12,14), [CnPy]BF4 (n = 9,11,13), tested the index of refraction of ionic liquids in the air and had a theoretical analysis. The results showed that: 1)For anionic BF4-and PF6-, as the growth of cationic side chain the ionic liquids refractive index would linearly increase; If ionic liquids anions are I-and Cl-, the refractive index of ionic liquids would linearly decease with side chain growth. Correlation coefficient R were 0.98854, 0.98004, 0.99942, 0.97888, 0.9793; 2)When the volume of anion is larger, the smaller to the refractive index of ionic liquids;3) With temperature increasing the refractive index of ionic liquid will decrease, and compared to PF6- / BF4- ,the I-/Cl- ionic liquids are more sensitive to the temperature change.