**************** The 13th., Lab Seminar *****************

Date: Mon, October 3, 2005  PM 1:30-

Place: No.616 Seminar room
　　　　　　 Graduate School of Information Science

Speaker: Yuusuke Oota

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

R. Kitaura, S. Kitagawa, Y. Kubota, T. C. Kobayashi, K. Kindo, Y. Mita, A.
Matsuo, M. Kobayashi, H. C. Chang, T. C. Ozawa, M. Suzuki, M. Sakata and M.Takata
Science 298 (2002) 2358-2361.

Abstract:
 Authors 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 (vdW) dimers of physisorbed O2
locate in the middle of nanochannnels 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 nanochannnels of CPL-1
(coordination polymer 1 with pillared layer structure).

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