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Achieving white light emission and increased magnetic anisotropy by transition metal substitution in functional materials based on dinuclear DyIII(4-pyridone)[MIII(CN)6]3− (M = Co, Rh) molecules

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Abstract

A building block approach has led to the construction of two unique bifunctional magneto-luminescent molecular materials, {[DyIII(4-pyridone)4(H2O)2][MIII(CN)6]}·nH2O (M = Co, n = 2, 1; M = Rh, n = 4, 2), incorporating the cyanido-bridged dinuclear {DyIIICoIII} (1) or {DyIIIRhIII} (2) molecules, that crystallize within the supramolecular network in the attractive non-centrosymmetric Cmc21 space group. Both compounds reveal dual physical properties of colour-tunable photoluminescence and slow relaxation of magnetization. While 1 exhibits multi-coloured photoluminescence ranging from yellow to blue, tuned by the excitation wavelength, 2 additionally reveals nearly white light emission under 336 nm excitation at room temperature. 1 and 2 show 4f-metal-centered strong magnetic anisotropy presenting Single-Molecule Magnet (SMM) behaviour with the large anisotropic energy barriers of 187(6) K for 1, and 214(4) K for 2. We have shown and discussed that the replacement of [CoIII(CN)6]3− by the heavier [RhIII(CN)6]3− analogue in {[DyIII(4-pyridone)4(H2O)2][MIII(CN)6]}·2H2O crystalline materials is an efficient route towards white light emissive solid state matrices composed of Single-Molecule Magnets with enhanced magnetic anisotropy. Such extraordinary photoluminescent molecule-based magnets can become good prerequisites for future application in bifunctional optical and magnetic devices.

Graphical abstract: Achieving white light emission and increased magnetic anisotropy by transition metal substitution in functional materials based on dinuclear DyIII(4-pyridone)[MIII(CN)6]3− (M = Co, Rh) molecules

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Publication details

The article was received on 30 Aug 2017, accepted on 18 Nov 2017 and first published on 18 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC03963H
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Achieving white light emission and increased magnetic anisotropy by transition metal substitution in functional materials based on dinuclear DyIII(4-pyridone)[MIII(CN)6]3− (M = Co, Rh) molecules

    J. Wang, S. Chorazy, K. Nakabayashi, B. Sieklucka and S. Ohkoshi, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC03963H

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