The structural origins of the selectivity of rubidium ion over other alkali metal ions by tribenzo-21-crown-7 is investigated from single-crystal X-ray diffraction: data for Cs(tribenzo-21-crown-7)(NO(3)), monoclinic, P2(1)/c, a = 9.598(2) Å, b = 23.466(3) Å, c = 23.
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