Halogen-Bonded Organic Framework (XOF) Based on Iodonium-Bridged N⋅⋅⋅I ⋅⋅⋅N Interactions: A Type of Diphase Periodic Organic Network.

Due to the fascinating structures and wide applications, porous materials with open frameworks have attracted more and more attentions. Herein, a novel two-dimensional (2D) halogen-bonded organic framework (XOF-TPPE) was successfully designed and fabricated by iodonium-bridged N⋅⋅⋅I ⋅⋅⋅N interactions between pyridyl groups and I for the first time. The formation of XOF-TPPE and its linear analogue was monitored by H NMR, UV-Vis, X-ray photoelectron spectroscopy (XPS), IR, SEM, TEM, HRTEM and selected-area electron diffraction (SAED). The structural model of XOF-TPPE was established based on powder X-ray diffraction (PXRD) data and theoretical simulations. Significantly, synchrotron small-angle X-ray scattering (SAXS), DLS and UV-Vis spectroscopy experiments suggested that XOF-TPPE still maintains a stable 2D framework structure in solutions. This research opens up a novel avenue for the development of organic frameworks materials, and may bring new promising applications for the field of porous materials.