These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 12.01.2020 and posted on 13.01.2020by Haisen Xu, Yi Luo, Xing Li, Pei Zhen See, Zhongxin Chen, Tianqiong Ma, Lin Liang, Kai Leng, Ibrahim Abdelwahab, Lin Wang, Runlai Li, Xiangyan Shi, Yi Zhou, Xiu Fang Lu, Xiaoxu Zhao, Cuibo Liu, Junliang Sun, Kian Ping Loh
Although polymers have been
studied for well over a century, there are few examples of covalently linked
polymer crystals synthesized directly from solution. One-dimensional (1D)
covalent polymers that are packed into a framework structure can be viewed as a
1D covalent organic framework (COF), but making single crystal of this has been
elusive. Herein, by combining labile metal coordination and dynamic covalent
chemistry, we discovered a strategy to synthesize single-crystal metallo-COF
under solvothermal conditions. The single-crystal structure was rigorously
solved using single-crystal electron diffraction (SCED) technique. The
non-centrosymmetric metallo-COF allows second harmonic generation (SHG). Due to
the presence of syntactic pendant amine groups along the polymer chains, the metallopolymer
crystal can be further cross-linked into a crystalline woven network.