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Crystal phase competition by addition of a second metal cation in solid solution metal-organic frameworks

AuthorsCastillo-Blas, Cecilia; Snejko, Natalia ; Peña-O'Shea, V. A. de la; Gallardo, J.; Gutiérrez-Puebla, Enrique ; Monge, M. Ángeles ; Gándara Barragán, Felipe
Issue Date2016
PublisherRoyal Society of Chemistry (UK)
CitationDalton Transactions 45(10): 4327-4337 (2016)
AbstractHerein 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 (Hhfipbb). During this study, four new MOFs have been isolated, denoted TMPF-88 [M(hfipbb)(triazole)(HO)], TMPF-90 [M(triazole)(OCHCH)], TMPF-91 [M(hfipbb)(triazole)(HO)] and TMPF-95 [M(hfipbb)(triazole)(HO)] (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.
Publisher version (URL)http://doi.org/10.1039/C5DT03856A
Identifiersdoi: 10.1039/c5dt03856a
e-issn: 1477-9234
issn: 1477-9226
Appears in Collections:(ICMM) Artículos
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