Mineral neogenesis as an inspiration for mild, solvent-free synthesis of bulk microporous metal–organic frameworks from metal (Zn, Co) oxides

Literature Information

Publication Date 2013-06-03
DOI 10.1039/C3GC40520F
Impact Factor 10.182
Authors

Cristina Mottillo, Yuneng Lu, Minh-Hao Pham, Matthew J. Cliffe, Trong-On Do, Tomislav Friščić


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Abstract

“Accelerated aging” is a simple and conceptually novel methodology for the synthesis of functional metal–organic materials, which seeks to provide a scalable, mild and environmentally-friendly alternative to solution-based or mechanochemical syntheses. Accelerated aging draws inspiration from slow processes of geological biomineralization and mineral neogenesis, and adapts them for the low-energy and solvent-free synthesis of modern metal–organic materials. This systematic study outlines the development of an accelerated aging synthesis of microporous frameworks from metal oxides CoO and ZnO. Whereas metal oxides often require high temperatures or aggressive reagents, accelerated aging allows their spontaneous transformation into porous materials under surprisingly mild conditions, akin to those of molecular self-assembly (humid air, up to 45 °C). Here, we describe how accelerated aging can be optimized for the one-step synthesis of multi-gram amounts of microporous solids. As targets, we selected popular zeolitic imidazolate frameworks (ZIFs): the sodalite-topology ZIF-8, its cobalt analogue ZIF-67, and a related zeolite RHO framework. Unlike conventional solution or mechanochemical syntheses, accelerated aging is diffusion-controlled and does not require continuous agitation, bulk solvent or high temperature. The syntheses of ZIF-8 and ZIF-67 contrast the conventional paradigm of metal–organic framework synthesis, by demonstrating that microporous materials can be spontaneously and efficiently assembled from a close-packed metal oxide without using solvents, high temperature or other activation (e.g. microwave, sonochemical, mechanochemical).

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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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