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. Issue 3 (29th November 2017)

• Record Type: Journal Article
• Authors: Wang, Junhao; Chorazy, Szymon; Nakabayashi, Koji; Sieklucka, Barbara; Ohkoshi, Shin-ichi
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 3(2017)
• Page Start: 473
• Page End: 481
• Publication Date: 2017-11-29
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc03963h
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Cobalt(iii ) replaced with heavier rhodium(iii ) in the Dy–Co/Rh molecular materials modulates their photoluminescent and magnetic properties. Abstract : A building block approach has led to the construction of two unique bifunctional magneto-luminescent molecular materials, {[Dy III (4-pyridone)4 (H2 O)2 ][M III (CN)6 ]}· n H2 O (M = Co, n = 2, 1 ; M = Rh, n = 4, 2 ), incorporating the cyanido-bridged dinuclear {Dy III Co III } (1 ) or {Dy III Rh III } (2 ) molecules, that crystallize within the supramolecular network in the attractive non-centrosymmetric Cmc 21 space group. Both compounds reveal dual physical properties of colour-tunable photoluminescence and slow relaxation of magnetization. While1 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 and2 show 4f-metal-centered strong magnetic anisotropy presenting Single-Molecule Magnet (SMM) behaviour with the large anisotropic energy barriers of 187(6) K for1, and 214(4) K for2 . We have shown and discussed that the replacement of [Co III (CN)6 ] 3− by the heavier [Rh III (CN)6 ] 3− analogue in {[Dy III (4-pyridone)4 (H2 O)2 ][M III (CN)6 ]}·2H2 O 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.