期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 289, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2019.109643
关键词
Solvent-free synthesis; Open-framework; Crystal structure; Indium phosphite-oxalate; Proton conductivity
类别
资金
- National Natural Science Foundation of China [21201095, 21301170]
- Opening Project of Guangxi Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization [2016KLOG12]
- College Students' Innovative Entrepreneurial Training Program [201710148000001]
Under solvent-free conditions, two new 3D open-framework indium phosphite-oxalates In-5(HPO3)(6)(H1.5PO3)(2)(C2O4)(2)center dot(H(2)A)(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 (4(12), 6(3)). 1 and 2 are also characterized by powder X-ray diffraction, IR spectroscopy, SEM, TGA, ICPAES 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 x 10(-3) S cm(-1) and 2.1 x 10(-3) S cm(-1) at 75 degrees C and 98% RH, respectively.
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