TY - JOUR
T1 - A study on proton conduction in a layered metal–organic framework, Rb2(adp)[Zn2(ox)3]·3H2O (adp = adipic acid, ox2 − = oxalate)
AU - Sadakiyo, Masaaki
AU - Yamada, Teppei
AU - Kitagawa, Hiroshi
N1 - Funding Information:
This work was supported by the JSPS Research Fellowships for Young scientists No. 21·4405 , Grant-in-Aid for Scientific Research No. 20350030 and No. 22108526 .
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - We newly synthesized a metal–organic framework (MOF) Rb2(adp)[Zn2(ox)3]·3H2O (adp = adipic acid; ox2 − = oxalate), where the rubidium ions, carboxylic acid groups, and water molecules are located in an interlayer space of a two-dimensional (2-D) oxalate-bridged network. The structure of this compound was determined using single-crystal X-ray diffraction analysis. Hydrated phases of this compound were examined using thermogravimetry and water vapor adsorption measurements. Proton conductivity in this MOF was investigated by alternating current impedance measurements. Systematic comparison with previously reported isomorphous 2-D compounds A2(adp)[Zn2(ox)3]·3H2O (A = NH4 and K) showed that the difference in the ionic radii of the cations leads to a difference in activation energy of proton conductivity and that absence of NH4+ ions causes a significant decrease in proton conductivity, even though the ionic radius of Rb+ (1.52 Å) is closer to that of NH4+ (1.61 Å) than that of K+ (1.38 Å).
AB - We newly synthesized a metal–organic framework (MOF) Rb2(adp)[Zn2(ox)3]·3H2O (adp = adipic acid; ox2 − = oxalate), where the rubidium ions, carboxylic acid groups, and water molecules are located in an interlayer space of a two-dimensional (2-D) oxalate-bridged network. The structure of this compound was determined using single-crystal X-ray diffraction analysis. Hydrated phases of this compound were examined using thermogravimetry and water vapor adsorption measurements. Proton conductivity in this MOF was investigated by alternating current impedance measurements. Systematic comparison with previously reported isomorphous 2-D compounds A2(adp)[Zn2(ox)3]·3H2O (A = NH4 and K) showed that the difference in the ionic radii of the cations leads to a difference in activation energy of proton conductivity and that absence of NH4+ ions causes a significant decrease in proton conductivity, even though the ionic radius of Rb+ (1.52 Å) is closer to that of NH4+ (1.61 Å) than that of K+ (1.38 Å).
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U2 - 10.1016/j.inoche.2016.08.016
DO - 10.1016/j.inoche.2016.08.016
M3 - Article
AN - SCOPUS:84984985006
SN - 1387-7003
VL - 72
SP - 138
EP - 140
JO - Inorganic Chemistry Communications
JF - Inorganic Chemistry Communications
ER -