Breathing Under Water: Metal-Organic Frameworks

  • Author: Sarah Millar
  • Published Date: 15 June 2014
  • Source / Publisher: Chemistry – A European Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Breathing Under Water: Metal-Organic Frameworks

Related Societies

Responsive materials change either their properties or function with external stimuli, such as temperature, light, pressure, electric and magnetic fields, and chemical triggers. This ability makes them of interest for sensors, detectors, actuators, and transducers. Metal–organic frameworks (MOFs), especially soft porous crystals, are one promising class of responsive materials as addition and removal of guest molecules in the crystal lattice can result in significant changes in the shape or size including breathing-like movements upon contraction and expansion or single-crystal-to-single-crystal (SCSC) transformations.

Ye-Feng Yao, East China Normal University, Zhe-Ming Wang, Peking University, Wen Zhang, Southeast University, all China, and colleagues have created a metal–cyanide framework, [CH6N3]2[FeK2(H2O)6(CN)6], that undergoes a reversible SCSC transformation triggered by dehydration and rehydration. The structure consists of a two-dimensional bimetallic layer with guanidinium cations residing in K4Fe3 defective cubane units.
Upon dehydration, the framework transforms to the dehydrated form, [CH6N3]2[FeK2(CN)6]. The reversible dehydration–rehydration process causes a uniaxial or accordion-like contraction–expansion movement along the crystallographic c axis. The size changes by as much as 24 %, which is rare in responsive MOF crystals. This responsive behavior arises from weak hydrogen-bonding interactions and electrostatic interactions that generate cooperativity among the water molecules, K ions, and CN groups between the two-dimensional bimetallic layers.


Article Views: 3107

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

1 Comments

DAVID TAIWO ISHOLA wrote:

Breathing under water

Inspirational and educative to the field of organo-metallics in Chemistry. Great work

Wed Jun 18 14:08:20 UTC 2014

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more

Follow on Facebook Follow on Twitter Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH