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Issue 3, 2019
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Benzoic acid as a selector–modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)

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Abstract

The concentration of benzoic acid was found to exercise efficient control over the formation of either MIL-101(Cr) or MIL-88B(Cr) under otherwise similar hydrothermal synthetic conditions. Nanocrystals of MIL-101(Cr) with ∼100 nm average size and excellent SBET = 3467 m2 g−1 are obtained at lower concentrations of benzoic acid, while at higher concentrations the microparticulated MIL-88B(Cr) product is formed. Hereby a new efficient synthetic method towards the elusive MIL-88B(Cr), yet reported only once without synthetic details, is proposed. The obtained MIL-88B(Cr) has an interesting and potentially valuable property of retaining its high-volume form (Vcell ∼ 2000 Å3) after thermal activation. The degassing of MIL-88B(Cr) in a vacuum at 250 °C yields a porous material with a SBET area of 1136 m2 g−1, which is around the theoretical maximum. The transition to the denser ‘closed’ form (Vcell ∼ 1500 Å3) occurs only at 350 °C, when all of the benzoate/benzoic acid, hindering the process, is removed.

Graphical abstract: Benzoic acid as a selector–modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)

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Publication details

The article was received on 19 Oct 2018, accepted on 12 Dec 2018 and first published on 12 Dec 2018


Article type: Paper
DOI: 10.1039/C8DT04186E
Citation: Dalton Trans., 2019,48, 989-996
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    Benzoic acid as a selector–modulator in the synthesis of MIL-88B(Cr) and nano-MIL-101(Cr)

    L. Yang, T. Zhao, I. Boldog, C. Janiak, X. Yang, Q. Li, Y. Zhou, Y. Xia, D. Lai and Y. Liu, Dalton Trans., 2019, 48, 989
    DOI: 10.1039/C8DT04186E

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