Under solvent-free conditions, two new 3D open-framework indium phosphite-oxalates In₅(HPO₃)₆(H_1.5PO₃)₂(C₂O₄)₂·(H₂A)₂, where A = C₅N₂H₁₂ (compound 1) and C₆N₂H₁₄ (compound 2), are synthesized by using 1-methylpiperazine and 1-ethylpiperazine as the structure-directing agent, respectively. Single crystal X-ray diffraction reveals that these two compounds have the analogue inorganic framework structures, which may be viewed as the assembly of butterfly motifs and [C₂O₄²⁻] groups. Interestingly, the butterfly motif is firstly reported in metal phosphite/phosphite-oxalate. By regarding the butterfly motifs as topologically equivalent 4-connected nodes and thus framework can be simplified into a uninodal pcu network with point symbol of (4¹², 6³). 1 and 2 are also characterized by powder X-ray diffraction, IR spectroscopy, SEM, TGA, ICP-AES and elemental analyses. In addition, proton conduction was investigated by alternating-current impedance analysis and the results demonstrate that both compounds show high proton-conductive properties with the conductivity of 3.4 × 10⁻³ S cm⁻¹ and 2.1 × 10⁻³ S cm⁻¹ at 75 °C and 98% RH, respectively.

在无溶剂条件下，制备了两种新的3D开放式亚磷酸亚草酸铟In ₅（HPO ₃）₆（H _1.5 PO ₃）₂（C ₂ O ₄）₂ ·（H ₂ A）₂，其中A = C ₅ N ₂ H ₁₂（化合物1）和C ₆ N ₂ H ₁₄（化合物2）是分别通过使用1-甲基哌嗪和1-乙基哌嗪作为结构导向剂来合成的。X射线单晶衍射表明，这两种化合物具有类似的无机骨架结构，可以看作是蝴蝶图案和[C ₂ O ₄ ^2- ]基的组装体。有趣的是，首先在金属亚磷酸盐/亚磷酸盐-草酸盐中报道了蝴蝶图案。通过把蝴蝶基序拓扑等价4-连接的节点，因此框架可与（4点符号被简化成一个单节PCU网络¹²，6 ³）。1和2粉末X射线衍射，红外光谱，SEM，TGA，ICP-AES和元素分析也表征了它们的特征。另外，通过交流阻抗分析研究了质子传导，结果表明这两种化合物均表现出高质子传导性，在室温下电导率分别为3.4×10 ^-3  S cm ^-1和2.1×10 ^-3  S cm ^-1  。分别为75°C和98％RH。