Journal
SCIENCE
Volume 298, Issue 5602, Pages 2358-2361Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1078481
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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 O-2 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 O-2 molecules in one-dimensional nanochannels of CPL-1 (coordination polymer 1 with pillared layer structure).
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