Gao, Chao; Li, Jian; Yin, Sheng; Sun, Junliang; Wang, Cheng published the artcile< Twist Building Blocks from Planar to Tetrahedral for the Synthesis of Covalent Organic Frameworks>, Synthetic Route of 576-83-0, the main research area is twist building planar tetrahedral covalent organic framework.
Rational construction of covalent organic frameworks (COFs) with novel structures still remains a challenge. Herein, we report the designed synthesis of two COFs, 2D-BPTA-COF and 3D-BMTA-COF, starting from biphenyl-based precursors but with different groups at the ortho positions. Both COFs exhibited high crystallinity and large surface area, and interestingly, 2D-BPTA-COF crystallizes into 2D sheets with AB stacking mode while 3D-BMTA-COF adopts a 7-fold interpenetrated structure with pts topol. This structural difference could be ascribed to the introduction of Me groups in the building blocks, as the dihedral angle of biphenyl rings in 2D-BPTA-COF is ∼0° while in 3D-BMTA-COF it is ∼60°. Therefore, it is possible to synthesize COFs with different structures by twisting building blocks from planar to tetrahedral with steric hindrance. We believe this result represents a general and straightforward way to expand the diversity of tetrahedral nodes for constructing 3D COFs in the future, and moreover, a new tetrahedral node for constructing 3D COFs is now available.
Journal of the American Chemical Society published new progress about Aminoplasts, polyazomethine- Role: PRP (Properties), SPN (Synthetic Preparation), TEM (Technical or Engineered Material Use), PREP (Preparation), USES (Uses). 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Synthetic Route of 576-83-0.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary