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Preparation of Unconventional Dendrimers that Contain Rigid NHTriazine Linkages and Peripheral tert ‐Butyl Moieties for CO 2 ‐Selective Adsorption
Author(s) -
Lee ChengHua,
Tsai MengRong,
Chang YenTzu,
Lai LongLi,
Lu KuangLieh,
Cheng KungLung
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201202161
Subject(s) - dendrimer , thermogravimetric analysis , chemistry , triazine , moiety , hydrogen bond , thermal stability , protonation , imidazole , molecule , polymer chemistry , organic chemistry , ion
Three unconventional dendrimers that contained rigid NHtriazine linkages and peripheral tert ‐butyl moieties were prepared by using a convergent approach and characterized by 1 H and 13 C 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 NHtriazine moiety, which possessed protonated and proton‐free nitrogen sites (like the imidazole unit), displayed the capture of polarizable CO 2 molecules through hydrogen‐bond and/or dipole–quadrupole interactions. In addition, the adsorption of various amounts of CO 2 and N 2 at different pressures suggests that the dendritic pores, which arise from the stacking of the middle co‐planar and rim protuberant dendrimers, G n ‐N∼N‐G n ( n =1–3), either swell or shrink at high pressure, thus indicating that these dendrimers may have a breathing ability.