η-Arene complexes of scandium(0) and scandium(II )
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Cocondensation of scandium vapour with 1,3,5-tri-tert-butylbenzene affords the first example of a scandium(0) complex, the sandwich compound bis(η-1,3,5-tri-tert-butylbenzene)scandium; ESR and UV studies also the reveal the presence of a second compound from this reaction, formulated as a similarly unique example of scandium(II) arising from activation of one of the methyl groups of a tert-butyl ring substituent.Keywords:
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1. History of Yttrium and Scandium. 2. Chemical and Physical Properties of Scandium and Yttrium. 3. Analytical Chemistry of Scandium and Yttrium. 4. Occurrence of Scandium and Yttrium in Nature. 5. Occurrence of Scandium and Yttrium in Organisms. 6. Interactions of Scandium and Yttrium with Molecules of Biological Interest. Suggested Further Reading. Index.
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Abstract In this work, the effects of scandium introduction on the luminescence of yttrium scandium (Sc) aluminium garnet powders doped with ytterbium (YSAG: Yb 3+ ) were investigated. Based on photoluminescence (PL) and photoluminescence excitation (PLE) spectra we made conclusions about the influence of scandium concentration and location on emission properties of ytterbium ions in YSAG. On the one hand, an analysis of the data showed that the increase of Sc concentration leads to broadening spectral lines regardless of a location of scandium ions in the crystal structure. On the other hand, the photoluminescence intensity of ytterbium ions in YSAG is more sensitive to scandium in the octahedral site than to scandium in the dodecahedral site.
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Bis-(1’-phenyl-3’-methyl-5’-oxopyrazol-4’-yl)-phthaldione, an acyclic β-diketone type quadridentate chelating agent, was synthesized for the first time by the aμthors. Due to the ferro-philic and rock-philic geochemical properties, scandium is highly dispersed with a complicated composition. Besides, the properties of scandium are very similar to those of the other 16 rare earth elements. Hence, the separation of scandium from both the other rare earth and non-rare earth impurities is an important subject.
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