Preparation of Unconventional Dendrimers that Contain Rigid NHTriazine Linkages and Peripheral tert ‐Butyl Moieties for CO 2 ‐Selective Adsorption

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.