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Chiral Coordination Polymers Based on d10 metals and 2-aminonicotinate with Blue Fluorescent/Green Phosphorescent Anisotropical Emissions

Abstract

Detailed structural characterization and photoluminescence (PL) properties of two new isostructural coordination polymers (CPs) based on 2-aminonicotinate (2ani) ligand and zinc(II) or cadmium(II) metal ions, namely [M(μ-2ani)2]n [MII = Zn(1), Cd(2)], is reported. These compounds are characterized for being chiral 2D-layered structures resulting from bridging of 2ani ligands in the MN2O4 coordination shell. Strong supramolecular interactions are found to sustain the overall crystal building, a fact that affords high stability to these materials. Illumination of single crystals of 1 reveals waveguiding behaviour along some preferred orientations. Examination of polycrystalline samples of both compounds under UV ligth alos exhibits remarkably strong PL emissions, which consist of blue fluorescence and green phosphorescence that entail long-lasting phosphorescence (LLP) at low temperature. Fitting of the decay curves confirms the occurrence of short (in the order of nanoseconds) and very large lifetimes (τ ≈ 320 and 560 ms for 1 and 2, respectively) for the wavelengths responsible for their blue and green emissions, respectively, which have been inspected by DFT calculations.

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Publication details

The article was received on 26 Mar 2018, accepted on 04 Jun 2018 and first published on 04 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01159A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Chiral Coordination Polymers Based on d10 metals and 2-aminonicotinate with Blue Fluorescent/Green Phosphorescent Anisotropical Emissions

    O. Pajuelo-Corral, A. Rodríguez Diéguez, J. A. Garcia, E. San sebastian, J. M. Seco and J. Cepeda, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT01159A

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