2013 Fiscal Year Research-status Report
Investigation of gated adsorption with time-resolved imaging using XFEL (X-ray Free Electron Laser)
| Project/Area Number |
25870360
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Research Institution | Kyoto University |
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Principal Investigator |
FOO MawLin 京都大学, 物質-細胞統合システム拠点, 助教 (20646765)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | X線自由電子レーザー / 多孔性配位高分子 / 細孔 / 光照射 / X線回折 / 吸着 |
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| Research Abstract |
The aim of our project is to elucidate with the X-ray Free Electron laser (XFEL) real-time dynamic behavior from porous coordination polymers (PCP) under stimuli (gas, light).
From FY 2012, we had three beam times (Nov 2012, Feb 2013, Nov 2013). In these beam times, we have gradually improved our sample cells and detector. From the first beam time, the sample cell was an open holder and we could only have a 2-theta 10 degree range for our detector. Now we could do diffraction in capillaries with a MPCCD detector possessing 2-theta 40 degree range.
In our first beam time in Nov 2012, we measured static samples of 1, [Zn(ip)(bpy)]; 2, [Cu(ip)(H2O)]; 3, [Zn(5-NO2-ip)(dpe)] (bpy= bipyridine, H2ip= isophtalic acid, dpe= 1,2-di(4-pyridyl)ethylene). Note the results are obtained for accumulation of 1000 shots.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Recently, we attempted to perform [2+2] photodimerization with XFEL laser at 260 nm on 4, [Zn(isopthalic)(bpy)], which we have previously published on. Since the sample cells were sealed capillaries, we repeated the same irradiation under an atmosphere of CO2. However we did not observe any significant changes in the diffraction pattern.
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| Strategy for Future Research Activity |
For our next beam time, we will attempt to do cis-trans isomerism of azo-benzene in a soft porous coordination polymer (PCP), Zn-JAST-1 or [Zn(bdc)(DABCO)] (H2BDC= terephthalic acid, DABCO= 1,4-diazabicyclo[2.2.2]octane). On irradiation, the XRD pattern changes from tetragonal to monoclinic. With the pico-second time scale of the phase change of azobenzene and the time resolution of the XFEL laser at pico-seconds, we intend to use the XFEL to see the transformation of the PCP lattice with time with the help of pump probe reactions.
There are also plans to shift the gas adsorption system from Spring 8 to SACLA in the near future to enable us to study the dynamic breathing behavior of PCP under gas stimuli.
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