10361-84-9Relevant articles and documents
Scandium/Alkaline Metal-Organic Frameworks: Adsorptive Properties and Ionic Conductivity
Cepeda, Javier,Pérez-Yá?ez, Sonia,Beobide, Garikoitz,Castillo, Oscar,Goikolea, Eider,Aguesse, Frederic,Garrido, Leoncio,Luque, Antonio,Wright, Paul A.
, p. 2519 - 2528 (2016)
Several synthetic approaches have been employed to obtain novel {[ScM(μ4-pmdc)2(H2O)2]·solv}n [EHU1(Sc,M)] (where M = Li, Na; pmdc = pyrimidine-4,6-dicarboxylate; solv = corresponding solvent) compounds. The synthesis method is crucial to determine the type of alkaline that could be hosted in the structure as well as the crystallinity, adsorption performance, and ionic conductivity of the resulting materials. Compared with other synthetic methods, a heat-assisted solvent-free procedure has proven to be the most effective route, giving materials with adsorption capacities close to those expected from GCMC (Grand Canonical Monte Carlo) calculations. Despite the presence of alkaline ions in the framework, the pristine materials exhibit rather low conductivity values of ca. 10-7 S cm-1. The concentration of charge carriers has been increased by means of a doping approach that incorporates divalent transition metal ions to the structure and forces an increase of the alkaline ions, thus raising the ionic conductivity by 1 order of magnitude. Additionally, soaking the samples in solutions containing alkaline salts led to materials possessing an even higher number of carriers achieving conductivity values among the best results reported for MOFs at room temperature, i.e., 4.2 × 10-4 and 9.2 × 10-5 S cm-1 for EHU1(Sc,Li) and EHU1(Sc,Na) obtained by the solvent-free procedure, respectively.
Lanthanide-doped Sr2ScF7 nanocrystals: controllable hydrothermal synthesis, the growth mechanism and tunable up/down conversion luminescence properties
Zhao, Bei,Shen, Dingyi,Yang, Jun,Hu, Shanshan,Zhou, Xianju,Tang, Jianfeng
, p. 3264 - 3275 (2017)
Sr2ScF7:Ln3+ (Ln = Ce, Tb, Eu, Sm, Dy, Er, Tm, Ho and Yb) nanocrystals were firstly synthesized via a one-step hydrothermal route without employing any surfactants. The shape and size of the Sr2ScF7 nanocrystals could be readily tuned from nanorods with 120 nm length and 50 nm width to nanoparticles with a uniform diameter of 15 nm by doping 30% Ln3+ with a larger ionic radius. Furthermore, the influence of pH values, F? sources and different surfactants on the sizes and morphologies (including nanorods, quadrangular microplates, cubes and polyhedrons) of the as-prepared products was systematically investigated and the possible formation mechanism for the products has been proposed. The XRD, SEM, EDS, PL analysis and decay lifetimes were used to characterize the products. For DC photoluminescence, the Sr2ScF7:Ln3+ nanocrystals show the characteristic f-f transitions with emission colors of bluish violet (Ce3+, Tm3+), green (Tb3+, Er3+, Ho3+), blue (Dy3+) and orange (Eu3+, Sm3+) respectively. Under single wavelength 980 nm excitation, the blue UC emissions of Sr2ScF7:Yb3+,Tm3+ nanocrystals at 474 nm due to the 1G4 → 3H6 transition of Tm3+, the green UC emissions of Sr2ScF7:Er3+ nanocrystals at 522/544 nm assigned to the 2H11/2 → 4I15/2/4S3/2 → 4I15/2 transitions and the red UC emissions of Sr2ScF7:Yb3+,Er3+ at 660 nm from 4F9/2 → 4I15/2 transition of Er3+ were observed. Based on the generation of red, green, and blue emissions, the Sr2ScF7:Yb3+,Er3+,Tm3+ nanocrystals could produce multicolor, particularly in the white region (0.320, 0.330) by controlling the doping concentration of Tm3+ in the Sr2ScF7:Yb3+,Er3+,Tm3+ nanocrystals. Controlling the doping concentration of Tm3+ is an effective way of modulating the luminescence properties of Sr2ScF7:Ln3+ by controlling its size and morphology. The as-synthesized phosphors might be potentially applied in the fields of color displays, light, photonics and biological imaging.
Kobayashi, Takaaki,Takei, Humihiko
, p. 243 - 252 (1980)
Two Series of New Volatile Rare-Earth Metal Tris(guanidinates) and Tris(amidinates)
Tutacz, Peter,Harmgarth, Nicole,Z?rner, Florian,Liebing, Phil,Hilfert, Liane,Engelhardt, Felix,Busse, Sabine,Edelmann, Frank T.
, p. 1653 - 1659 (2018)
Two series of new volatile, homoleptic lanthanide(III) tris(guanidinate) and tris(amidinate) complexes were synthesized and fully characterized. Treatment of anhydrous rare-earth metal(III) chlorides, LnCl3, with three equiv. of the aziridine-derived lithium guanidinate Li[c-C2H4NC(NiPr)2] (3) afforded the new homoleptic tris(guanidinate) complexes [c-C2H4NC(NiPr)2]3Ln (4) (Ln = Sc, Pr, Nd, Sm, Eu, Ho, Tm) in good yields (68–80 %). In a similar manner, the homoleptic tris(amidinate) complexes [iPrC(NiPr)2]3Ln (6) Ln = Sc, Ce, Pr, Nd, Tb, Dy, Er, Yb) were prepared from LnCl3 and the all-isopropyl-substituted lithium amidinate Li[iPrC(NiPr)2] (5) in a molar ratio of 1:3. Variable-temperature 1H NMR studies of the paramagnetic derivatives 4Pr–4Tm revealed Curie-type behavior. 1H NMR spectroscopic data of complexes 6 indicated severe steric crowding due to the presence of nine isopropyl groups in these molecules. The molecular and crystal structures of eight title compounds (4Sc, 4Pr, 4Nd, 4Sm, 4Eu, 4Ho, 4Tm, and 6Er) were determined through single-crystal X-ray diffraction studies. All complexes 4 exhibit similar molecular structures, comprising distorted octahedral molecular structures with small bite angles. Sublimation temperatures of 4 at 0.05 mbar were determined to be in the range between 151 °C (4Eu) and 194 °C (4Tm), whereas the complexes 6 sublime in the temperature range between 140 °C (6Sc) and 180 °C (6Ce), so that the use of these precursors in future ALD or CVD studies appears feasible.
Color-tunable and enhanced luminescence of well-defined sodium scandium fluoride nanocrystals
Fu, Hongbo,Yang, Guixin,Gai, Shili,Niu, Na,He, Fei,Xu, Jie,Yang, Piaoping
, p. 7863 - 7870 (2013)
In this paper, well-defined and regular-shaped Na3ScF 6 nanocrystals (NCs) have been synthesized in high boiling organic solvents 1-octadecene (ODE) and oleic acid (OA), via the thermal decomposition of rare-earth oleate precursors. It is found that highly uniform monoclinic Na3ScF6 NCs with narrow size distribution have been obtained, which can easily be dispersed in cyclohexane solvent to form transparent colloid solutions. Upon 980 laser diode (LD) excitation, the relative up-conversion (UC) emission intensities of different colors in Yb 3+/Er3+, Yb3+/Tm3+ and Yb 3+/Ho3+ doped Na3ScF6 can be tuned by altering the Yb3+ doping concentration, resulting in the tunable multicolor in a wide range. On the basis of the emission spectra and the plot of luminescence intensity to pump power, the UC mechanisms of the co-doped Na 3ScF6 NCs were investigated in detail. Moreover, the UC emission intensities can be significantly improved by coating a layer of Na 3ScF6:Yb3+/Ln3+ shell on Na 3ScF6:Yb3+/Ln3+ cores with respect to that of pure Na3ScF6:Yb3+/Ln3+ core NCs. Furthermore, transparent and UC luminescent NCs/polydimethylsiloxane (PDMS) composites with regular dimensions were also fabricated by an in situ polymerization route. Uniform NCs with a wide variation of luminescence colors will show potential applications in diverse fields.
An unexpected electro-luminescent properties of scandium(III) heteroaromatic 1,3-diketonate complex
Taydakov, Ilya,Vaschenko, Andrey,Strelenko, Yuri,Vitukhnovsky, Alexey
, p. 234 - 239 (2014)
A novel complex of Sc(III) with pyrazole substituted 1,3-diketone (1,3-bis(1,3-dimethyl-1H-pyrazol-4-yl)-1,3-propanedione) was synthesized and characterized by X-ray diffraction, nanotechnology-assisted laser desorption/ionisation time-of-flight mass spectroscopy (NALDI-TOF-MS) and NMR spectroscopy, including 45Sc NMR. The first sample of organic light-emitting diode (OLED) based on heteroaromatic Sc(III) 1,3-diketonate as an active layer was fabricated and tested. The maximum intensity of yellowish-green electroluminescence (530-560 nm) was equal to 40 cd/m 2 and turn-on voltage was about 4.5 V. Further device modification and ligand structure optimization can lead to a better performance of such materials for OLEDs.
Aggregates of complexes [Sc(H2O)4(NCS) 2]+ and [Sc(H2O)2(NCS) 4]- with 18-crown-6
Ilyukhin,Petrosyants
, p. 265 - 271 (2007)
The compounds [Sc(H2O)4(NCS)2][Sc(H 2O)2(NCS)4] ?2(18C6) (I) and [Sc(H 2O)4(NCS)2][Sc(H2O) 2(NCS)4] ? 3(18C6) ? H2/su
One-step surfactant-free synthesis of KSc2F7 microcrystals: controllable phases, rich morphologies and multicolor down conversion luminescence properties
Xiong, Jie,Yu, Jie,Zhang, Yufeng,Xia, Wenpeng,Hu, Shanshan,Zhang, Yanfei,Yang, Jun
, p. 3978 - 3986 (2018)
Homogeneous KSc2F7 microcrystals with controlled and abundant morphologies were prepared by a one-step hydrothermal route without employing any templates or surfactants. Particularly, uniform and well-defined KSc2F7 crystals with rod, sheet, flower-like, thin rectangular, xylitol-like and thin plate morphologies were achieved by manipulating the different environments of crystal growth, such as increasing the concentration of F-, changing pH and adding different surfactants. In addition, a phase transformation from monoclinic ScF3 to orthorhombic KSc2F7 was observed at different molar ratios of F/Sc and pH values, respectively. A more interesting thing is that the KSc2F7 crystals doped with 5% Ln3+ (Ln = La, Ce, Sm, Eu, Gd, Tb and Lu) showed rich morphologies and various sizes. The obtained KSc2F7:Ln3+ products showed multicolor emission with red (Eu3+), green (Tb3+) and blue (Ce3+), respectively. And the best emission conditions for KSc2F7 crystals are F/Sc/K = 3.5:1:3, pH = 7 and without any surfactants. The synthetic KSc2F7:Eu3+/Tb3+/Ce3+ phosphors may potentially be used for multicolor illumination and displays.
