Design and synthesis of phosphomolybdate coordination compounds based on {P_(4)Mo_(6)} structural units and their proton conductivity  

作　　者：Zhi-Xin Gao Sai Sun Bo Li Dong-Ming Cheng Yong-Hui Wang Hong-Ying Zang Yang-Guang Li 

机构地区：[1]Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education at Universities of Jilin Province,Faculty of Chemistry,Northeast Normal University,Changchun 130024,China

出　　处：《Tungsten》2023年第1期67-74,共8页钨科技（英文）

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. 21871042, 21471028, 21673098, and 21671036);Natural Science Foundation of Jilin Province (Grant No. 20200201083JC);Jilin Provincial Education Department (Grant No. JJKH20201169KJ);the Fundamental Research Funds for the Central Universities (Grant Nos. 2412015KJ012, 2412017BJ004);the support of the Jilin Provincial Department of Education。

摘　　要：Developing new low-cost and efficient proton-conducting materials remains an attractive and challenging task.Herein,sodium molybdate dihydrate is used as the source of molybdenum,mixed with transition metal chloride and 2-methylimidazole(2-MI),using the "one-pot method" to synthesize two crystalline proton conducting materials based on {P4Mo6} units:H14[C4H6N2]2[M(H_(2)O)5][M(H_(2)O)_(2)]_(2){M[(PO_(3))_(3)(PO_(4))Mo_(6)O_(15)]_(2)}·4H_(2)O(M=Co and Fe)(1-2).Different from the common{P4Mo_(6)},we use H3PO3to adjust the pH value,resulting in two different coordination modes of P atoms in the crystal structure.The structure is expanded into three-dimensional network by metal ions.At 75℃ and 98% relative humidity,the proton conductivity of compounds 1 and 2 are 1.33 ×10^(-2)S·cm^(-1)and 1.03×10^(-2)S·cm^(-1),respectively.The high proton conductivity is mainly attributed to the free state of 2-methylimidazole as the proton carrier,which has a fast migration rate.At the same time,2-methylimidazole,coordination water,and {P4Mo6} anion form a hydrogen bond network to provide multiple pathways for the transmission of protons.

关 键 词：Proton conduction POLYOXOMETALATE Coordination compound Crystalline material TEMPLATE MOLYBDENUM 

分 类 号：O62[理学—有机化学]