Robust Multifunctional Yttrium-Based Metal–Organic Frameworks with Breathing Effect
- 26 January 2017
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 56 (3), 1193-1208
- https://doi.org/10.1021/acs.inorgchem.6b02199
Abstract
Phosphonate- and yttrium-based metal–organic frameworks (MOFs), formulated as [Y(H5btp)]·5.5H2O (1), [Y(H5btp)]·2.5H2O (2), (H3O)[Y2(H5btp)(H4btp)]·H2O (3), and [Y(H5btp)]·H2O·0.5(MeOH) (4), were prepared using a “green” microwave-assisted synthesis methodology which promoted the self-assembly of the tetraphosphonic organic linker [1,1′-biphenyl]-3,3′,5,5′-tetrayltetrakis(phosphonic acid) (H8btp) with Y3+ cations. This new family of functional materials, isolated in bulk quantities, exhibits a remarkable breathing effect. Structural flexibility was thoroughly studied by means of X-ray crystallography, thermogravimetry, variable-temperature X-ray diffraction, and dehydration and rehydration processes, ultimately evidencing a remarkable reversible single-crystal to single-crystal (SC–SC) transformation solely through the loss and gain of crystallization solvent molecules. Topologically, frameworks remained unaltered throughout this interconversion mechanism, with all compounds being binodal 6,6-connected network with a Schäfli symbol of {413.62}{48.66.8}. Results show that this is one of the most stable and thermally robust families of tetraphosphonate-based MOFs synthesized reported to date. Porous materials 2 and 3 were further studied to ascertain their performance as heterogeneous catalysts and proton conductors, respectively, with outstanding results being registered for both materials. Compound 2 showed a 94% conversion of benzaldehyde into (dimethoxymethyl)benzene after just 1 h of reaction, among the best results registered to date for MOF materials. On the other hand, the protonic conductivity of compound 3 at 98% of relative humidity (2.58 × 10–2 S cm–1) was among the highest registered among MOFs, with the great advantage of the material to be prepared using a simpler and sustainable synthesis methodology, as well as exhibiting a good stability at ambient conditions (temperature and humidity) over time when compared to others.Keywords
Funding Information
- Centro de Investigação em Materiais Cerâmicos e Compósitos
- European Commission
- European Regional Development Fund (FCOMP-01-0124-FEDER-041282, POCI-01-0145-FEDER-007679)
- Fundação para a Ciência e a Tecnologia (EXPL/CTM-NAN/0013/2013, UID/CTM/50011/2013, UID/QUI/00062/2013, UID/QUI/00100/2013)
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