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Issue 40, 2018
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Zinc/itaconate coordination polymers as first examples with long-lasting phosphorescence based on acyclic ligands

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Abstract

Two novel coordination polymers (CPs) based on zinc(II) and acyclic dicarboxylate linkers, i.e. [Zn23-IA)2(H2O)4]n (1-W) and {[Zn2(μ-IA)2(DMF)]·H2O}n (2-DMF) (where IA2− = itaconate) have been obtained as a result of a systematic study of some synthetic factors such as pH and solvents, which has allowed optimizing the conditions that render the best yields. 1-W is obtained as X-ray quality single crystals upon which diffraction analysis has been conducted, showing that it consists of a neutral 2D layered structure. Some structural details have been elucidated for 2-DMF based on a comparison of PXRD data with 1-W and in view of the similar composition of both crystalline phases. Photoluminescence (PL) measurements confirm that 2-DMF presents slightly different spectra from those of 1-W. Time-dependent density functional theory (TD-DFT) calculations of 1-W reveal that electronic transitions arise from both first excited singlet and triplet states involving ligand-centred emissions. Moreover, both compounds exhibit blue fluorescence and green phosphorescence that involves less frequent long-lasting phosphorescence (LLP) at 10 K. Exhaustive characterization of long-lasting phosphorescence by means of time-resolved spectroscopy reveals remarkably long lifetimes (τ) of ca. 352 ms (λem ≈ 550 nm) for 1-W and 547 ms (λem ≈ 500 nm) for 2-DMF.

Graphical abstract: Zinc/itaconate coordination polymers as first examples with long-lasting phosphorescence based on acyclic ligands

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Publication details

The article was received on 20 Jul 2018, accepted on 12 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03598A
Citation: J. Mater. Chem. C, 2018,6, 10870-10880
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    Zinc/itaconate coordination polymers as first examples with long-lasting phosphorescence based on acyclic ligands

    A. H. Wibowo, Y. Suryandari, A. Masykur, S. Pérez-Yáñez, A. Rodríguez-Diéguez and J. Cepeda, J. Mater. Chem. C, 2018, 6, 10870
    DOI: 10.1039/C8TC03598A

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