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Cis- and Trans-9,10-di(1H-imidazol-1-yl)-anthracene based coordination polymers of ZnII and CdII: synthesis, crystal structures and luminescence properties

Abstract

New functional coordination polymers based on the semi-flexible 9,10-di(1H-imidazol-1-yl)-anthracene ligand (L) with ZnII and CdII, namely {[Zn(μ2-L)2](ClO4)2·m(MeOH)·n(DCM)}n (1), {[Zn(μ2-L)2](BF4)2·m(MeOH)·n(DCM)}n (2), {[Zn(μ2-L)2(p-Tos)2]·mDCM·nMeOH}n (3), {[Cd(μ2-L)2(p-Tos)2]·mDCM}n (4) {[Cd(μ2-L)2(p-Tos)2]·mMeOH·nDioxane}n (5) and {[Zn(μ2-L)2(CF3CO2)2]·2Dioxane}n (6) were obtained. Dissolving of L in polar solvent mixtures MeOH-DCM (4:1) or MeOH-Dioxane (1:1) with ZnII and CdII salts resulted in the formation of complexes 1–2, 5 adopting a cis-conformation of the imidazole groups in respect to anthracene. In less polar mixtures of solvents such as MeOH-DCM (1:4) trans-L is observed leading to the coordination polymers 3–4 with ZnII and CdII. In an intermediate solvent mixture such as MeOH-Dioxane (1:4), the cis- and trans-conformation coexist as exemplified in the complex 6 with ZnII. In the solid state, complexes 1–5 assemble as supramolecular 2-D coordination polymers with (4,4) topology, while 6 forms a tridimensional porous network with cds topology. All compounds reveal strong blue emission in solid state at room temperature.

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Publication details

The article was received on 06 Oct 2017, accepted on 30 Nov 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT03758A
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Cis- and Trans-9,10-di(1H-imidazol-1-yl)-anthracene based coordination polymers of ZnII and CdII: synthesis, crystal structures and luminescence properties

    S. Vasylevskyi, K. Regeta, A. Ruggi, S. Petoud, C. Piguet and K. Fromm, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03758A

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