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Issue 10, 2016
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Crystal phase competition by addition of a second metal cation in solid solution metal–organic frameworks

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Abstract

Herein we report a synthetic study focused on the preparation of solid-solution metal–organic frameworks, MOFs, with the use of two kinds of linkers. In particular, we have explored the system composed by zinc, cobalt, 1,2,4-triazole and 4,4′-hexafluoroisopropylidenebisbenzoic acid (H2hfipbb). During this study, four new MOFs have been isolated, denoted TMPF-88 [M3(hfipbb)2(triazole)2(H2O)], TMPF-90 [M2(triazole)3(OCH2CH3)], TMPF-91 [M2(hfipbb)(triazole)2(H2O)] and TMPF-95 [M5(hfipbb)4(triazole)2(H2O)] (TMPF = transition metal polymeric framework, M = Zn, Co, or mixture of them). The study demonstrates that the addition of a second metal element during the MOF synthesis has a major effect in the formation of new phases, even at very high Zn/Co metal ratios. Furthermore, we show that during the MOF formation reaction, there is a competition among different crystal phases, where kinetically favoured phases of various compositions crystallize in short reaction times, precluding the formation of the pure solid-solution phases of other energetically more stable MOFs.

Graphical abstract: Crystal phase competition by addition of a second metal cation in solid solution metal–organic frameworks

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Publication details

The article was received on 02 Oct 2015, accepted on 02 Dec 2015 and first published on 03 Dec 2015


Article type: Paper
DOI: 10.1039/C5DT03856A
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Citation: Dalton Trans., 2016,45, 4327-4337
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    Crystal phase competition by addition of a second metal cation in solid solution metal–organic frameworks

    C. Castillo-Blas, N. Snejko, V. A. de la Peña-O'Shea, J. Gallardo, E. Gutiérrez-Puebla, M. A. Monge and F. Gándara, Dalton Trans., 2016, 45, 4327
    DOI: 10.1039/C5DT03856A

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