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A non-interpenetrated anionic In-MOF(FJU-302)based on a linear H2bpdc and an angled H2cdc as dual-ligands was characterized by FT-IR,TGA and X-ray single-crystal/powder diffraction.FJU-302 crystallizes in the monoclinic system and I41/amd space group with a = 27.1274(8),b = 27.1274(8),c = 29.788(3)?,V =21921(2)?3,Z = 16,Mr= 608.32,Dc= 0.737 g/cm3,F(000)= 4848,μ(CuKa)= 3.659 mm-1,R = 0.0800 and wR =0.1911 for 5703 observed reflections(Ⅰ ＞ 2σ(Ⅰ)),and R = 0.1470 and wR = 0.2342 for all data.In this work,a carbazole based anionic In-MOF(FJU-302)was designed and synthesized,and the proton conductivity from subzero temperature(-30 ℃)to 70 ℃ was measured without additional humidity.FJU-302 presents a max proton conductivity of 6.47 × 10-4 S·cm-1 at 70 ℃,and it can maintain 5.88 × 10-7S·cm-1 at-30 ℃.This work reports a first carbazole based MOF for proton conductivity at subzero temperature conditions.