Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 45, Pages 13979-13984Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201606155
Keywords
composite microspheres; covalent organic frameworks; imines; nanoclusters; photothermal conversion
Categories
Funding
- State Key Project of Research and Development [2016YFC1100300]
- NSFC [21474015, 51633001]
- STCSM [14ZR1402300]
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An approach to transforming amorphous organic networks into crystalline covalent organic frameworks (COFs) with retention of the colloidal nanosize and uniform morphology is presented. Specifically, Fe3O4 nanoclusters are encapsulated by a disordering polyimine network via the Schiff-base reaction. The formed imine bonds could be reconstructed under thermodynamic control to reform the polyimine networks into imine-linked COFs insitu. Such a core-shell microsphere exhibits the uniform size and spherical shape, controllable COF shell thickness, accessible surface modification, and improved solution dispersibility as well as maintenance of high surface area, periodic micropores, and superior magnetic responsiveness. Additionally, the photothermal conversion effect is demonstrated for the first time on the nanoCOF layers upon exposure to near infrared light, providing convincing evidence for potential use in phototherapy.
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