A novel crownophane trapping CO2 as carbonic acid at room temperatureElectronic supplementary information (ESI) available: synthesis of compounds, 2 ? 4, and the data of their 1H NMR, IR, ESI mass spectra and elemental analysis, and the charts of IR spectrum and DTA and TGA thermograms of the solids separated out after bubbling CO2. See http://www.rsc.org/suppdata/cc/b4/b403152k/

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