TY - JOUR
T1 - Water-initiated ordering around a copper ion of copper acetate confined in slit-shaped carbon micropores
AU - Ohkubo, Takahiro
AU - Takehara, Yutaro
AU - Kuroda, Yasushige
N1 - Funding Information:
This work was partially supported by Grant-in-Aid for Scientific Research (A) (No. 21245006) and for Young Scientists (B) (No. 20750013) from Japan Society for the Promotion of Science (JSPS), TEPCO Research Foundation, Kao Foundation for Arts and Science, and The Japan Securities Scholarship Foundation. Also, this work has been performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2008G064 and 2010G148).
PY - 2012/5/15
Y1 - 2012/5/15
N2 - Physical or chemical properties of hydrated ions confined in solid nanospaces are not substantially understood, although they are indispensable for the development of new science and technology. We study the local structure around a Cu 2+ of copper acetate restricted in slit-shaped micropore of two kinds of activated carbon fibers (ACFs) by X-ray absorption fine structure (XAFS) technique. The results indicate that the highly dispersed copper acetate on the surface of ACFs can be partially dissolved after the adsorption of water. Also, when we adsorb water to copper acetate-deposited ACFs, the Cu-Cu distance of the dinuclear species of copper acetate becomes longer with the ordering of the Cu-Cu bond because of the reduction of the number of the bridging carboxylate inside the micropore. In addition, the results of EXAFS spectra suggest that water molecules can play an important role for the ordering of the specific dinuclear complex of copper acetate formed in the micropore even though the number of bridging carboxylate which can stabilize the dinuclear structure is decreased by the adsorption of water.
AB - Physical or chemical properties of hydrated ions confined in solid nanospaces are not substantially understood, although they are indispensable for the development of new science and technology. We study the local structure around a Cu 2+ of copper acetate restricted in slit-shaped micropore of two kinds of activated carbon fibers (ACFs) by X-ray absorption fine structure (XAFS) technique. The results indicate that the highly dispersed copper acetate on the surface of ACFs can be partially dissolved after the adsorption of water. Also, when we adsorb water to copper acetate-deposited ACFs, the Cu-Cu distance of the dinuclear species of copper acetate becomes longer with the ordering of the Cu-Cu bond because of the reduction of the number of the bridging carboxylate inside the micropore. In addition, the results of EXAFS spectra suggest that water molecules can play an important role for the ordering of the specific dinuclear complex of copper acetate formed in the micropore even though the number of bridging carboxylate which can stabilize the dinuclear structure is decreased by the adsorption of water.
KW - Activated carbon fiber (ACF)
KW - Copper acetate
KW - Hydration structure
KW - Liquid-phase adsorption
KW - X-ray absorption fine structure (XAFS)
UR - http://www.scopus.com/inward/record.url?scp=84857914553&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857914553&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2011.09.011
DO - 10.1016/j.micromeso.2011.09.011
M3 - Article
AN - SCOPUS:84857914553
VL - 154
SP - 82
EP - 86
JO - Microporous Materials
JF - Microporous Materials
SN - 1387-1811
ER -