Preparation of Unconventional Dendrimers that Contain Rigid NH[BOND]Triazine Linkages and Peripheral tert-Butyl Moieties for CO2-Selective Adsorption

Authors

  • Cheng-Hua Lee,

    1. Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou, Taiwan 545 (Taiwan), Fax: (+886) 49-2917956
    2. Institute of Chemistry, Academia Sinica, Taipei 115 (Taiwan)
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  • Meng-Rong Tsai,

    1. Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou, Taiwan 545 (Taiwan), Fax: (+886) 49-2917956
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  • Yen-Tzu Chang,

    1. Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou, Taiwan 545 (Taiwan), Fax: (+886) 49-2917956
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  • Prof. Dr. Long-Li Lai,

    Corresponding author
    1. Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou, Taiwan 545 (Taiwan), Fax: (+886) 49-2917956
    • Department of Applied Chemistry, National Chi Nan University, No.1 University Rd., Puli, Nantou, Taiwan 545 (Taiwan), Fax: (+886) 49-2917956
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  • Dr. Kuang-Lieh Lu,

    1. Institute of Chemistry, Academia Sinica, Taipei 115 (Taiwan)
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  • Dr. Kung-Lung Cheng

    1. Material and Chemical Research Laboratories, Industrial Research Institute, Hsinchu, Taiwan 300 (Taiwan)
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Abstract

Three unconventional dendrimers that contained rigid NH[BOND]triazine linkages and peripheral tert-butyl moieties were prepared by using a convergent approach and characterized by 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. Based on a thermogravimetric analysis study, these dendrimers were observed to display thermal stability at about 300 °C. The NH[BOND]triazine moiety, which possessed protonated and proton-free nitrogen sites (like the imidazole unit), displayed the capture of polarizable CO2 molecules through hydrogen-bond and/or dipole–quadrupole interactions. In addition, the adsorption of various amounts of CO2 and N2 at different pressures suggests that the dendritic pores, which arise from the stacking of the middle co-planar and rim protuberant dendrimers, Gn-N∼N-Gn (n=1–3), either swell or shrink at high pressure, thus indicating that these dendrimers may have a breathing ability.

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