Self-templated chemically stable hollow spherical covalent organic framework

Sharath Kandambeth, V. Venkatesh, Digambar B. Shinde, Sushma Kumari, Arjun Halder, Sandeep Verma and Rahul Banerjee ()
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Sharath Kandambeth: CSIR-National Chemical Laboratory
V. Venkatesh: Indian Institute of Technology Kanpur
Digambar B. Shinde: CSIR-National Chemical Laboratory
Sushma Kumari: Academy of Scientific and Innovative Research (AcSIR)
Arjun Halder: CSIR-National Chemical Laboratory
Sandeep Verma: Indian Institute of Technology Kanpur
Rahul Banerjee: CSIR-National Chemical Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract Covalent organic frameworks are a family of crystalline porous materials with promising applications. Although active research on the design and synthesis of covalent organic frameworks has been ongoing for almost a decade, the mechanisms of formation of covalent organic frameworks crystallites remain poorly understood. Here we report the synthesis of a hollow spherical covalent organic framework with mesoporous walls in a single-step template-free method. A detailed time-dependent study of hollow sphere formation reveals that an inside-out Ostwald ripening process is responsible for the hollow sphere formation. The synthesized covalent organic framework hollow spheres are highly porous (surface area ∼1,500 m2g−1), crystalline and chemically stable, due to the presence of strong intramolecular hydrogen bonding. These mesoporous hollow sphere covalent organic frameworks are used for a trypsin immobilization study, which shows an uptake of 15.5 μmol g−1 of trypsin.

Date: 2015
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DOI: 10.1038/ncomms7786

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