Employing polynuclear cluster-based nodes can make metal–organic frameworks have higher porosity and good stability. In this work, by using compound [(Me2NH2)­Eu­(L)­(DMA)­(H2O)] n (1) as reactant, polynuclear cluster-based [(Me2NH2)­Eu5(L)4(DMA)4(H2O)6] n (2) (H4L = 1,3-bis-[3,5-bis­(carboxy)­phenoxy]­propane) can be synthesized successfully. Although two compounds are all three-dimensional microporous anionic frameworks, the water-stability and porosity of compound 2 is higher than that of compound 1. Compound 2 is assembled by two kinds of multinuclear metal units in which one Eu­(III) ion center is hexa-coordinated. The luminescence studies exhibited that compound 2 performed a highly selective photoluminescence quenching toward nitrobenzene and Fe­(III) ion. So, compound 2 can be possibly developed as a dual functional chemosensor for detecting Fe­(III) ion and nitrobenzene. Furthermore, compound 2 also has the potential ability to absorb and remove toxic metal ions from aqueous solution.

Four new Ni(ii) metal–organic frameworks with diverse structures have been synthesized under different conditions. The structural transformation from compound 4 to 3 has also been investigated.

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