Alkaline Earth Metal (Mg, Sr, Ba)鈥揙rganic Frameworks Based on 2,2鈥?6,6鈥?Tetracarboxybiphenyl for Proton Conduction

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• 作者：Xi-Yan Dong ; Xiao-Peng Hu ; Hong-Chang Yao ; Shuang-Quan Zang ; Hong-Wei Hou ; Thomas C.W. Mak
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：November 17, 2014
• 年：2014
• 卷：53
• 期：22
• 页码：12050-12057
• 全文大小：592K
• ISSN：1520-510X

文摘

Three new alkaline earth metal based metal鈥搊rganic frameworks (MOFs), namely M-BPTC (M = Mg, Sr, Ba), have been synthesized by using BPTC (2,2鈥?6,6鈥?tetracarboxybiphenyl) as ligand under hydrothermal conditions. These MOFs exhibit interesting structural diversity, variable chemical and thermal stability, as well as proton conductivity. Mg-BPTC with the formula {[Mg(BPTC)_0.5(H₂O)₃]路5H₂O}_n consists of BPTC^{4鈥?/sup> extended metal layers, and novel highly ordered infinite tape-like structures of cyclic water octamers reside interlayer. Three-dimensional porous {[Sr₂(BPTC)(H₂O)₆]路H₂O}_n (Sr-BPTC) features inorganic Sr鈥揙 chains (I1O2) and open hydrophilic channels where water heptamers and carboxyl oxygen atoms conspire to form H-bond networks, whereas 3D {[Ba₆(BPTC)₃(H₂O)₆]路11H₂O}_n (Ba-BPTC) shows Ba鈥揙 inorganic layer (I2O1) and 1D channels incorporating large water 14-mers and 18-mers. M-BPTC (M = Mg, Sr) species exhibit excellent water stability and proton conductivity due to their respective appropriate pathways for proton transporting. M-BPTC (M = Sr, Ba) structures are highly thermally stable due to the presence of the inorganic connectivity. The present results suggest that M-BPTC (M = Mg, Sr) are promising materials for proton conduction and provide insight into the hydrogen bonding motif.}