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Science 20 December 2002:
Vol. 298. no. 5602, pp. 2358 - 2361
DOI: 10.1126/science.1078481
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Reports

Formation of a One-Dimensional Array of Oxygen in a Microporous Metal-Organic Solid

Ryo Kitaura,1 Susumu Kitagawa,1* Yoshiki Kubota,2 Tatsuo C. Kobayashi,3 Koichi Kindo,3 Yoshimi Mita,4 Akira Matsuo,3 Michihiro Kobayashi,4 Ho-Chol Chang,1 Tadashi C. Ozawa,3 Megumi Suzuki,4 Makoto Sakata,5 Masaki Takata56

We report the direct observation of dioxygen molecules physisorbed in the nanochannels of a microporous copper coordination polymer by the MEM (maximum entropy method)/Rietveld method, using in situ high-resolution synchrotron x-ray powder diffraction measurements. The obtained MEM electron density revealed that van der Waals dimers of physisorbed O2 locate in the middle of nanochannels and form a one-dimensional ladder structure aligned to the host channel structure. The observed O-O stretching Raman band and magnetic susceptibilities are characteristic of the confined O2 molecules in one-dimensional nanochannels of CPL-1 (coordination polymer 1 with pillared layer structure).

1 Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
2 Department of Environmental Sciences, Osaka Women's University, Sakai, Osaka 590-0035, Japan.
3 KYOKUGEN,
4 Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan.
5 Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.
6 JASRI/Spring-8, Koto, Hyougo, 679-5189, Japan.
*   To whom correspondence should be addressed. E-mail: Kitagawa{at}sbchem.kyoto-u.ac.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)