Bis phenylethynyl ytterbium II

Mt is undesirable to carry out the reaction at a significantly higher concentration or a purple solid coprecipitates with mercury and the excess of ytterbium. 

The complex can be recrystallized from THF-light petroleum ether if required. 

Bis(phenylethynyl)ytterbium(II) is very sensitive to oxygen and water both in solution and the solid state. It is indeiinitely stable under purified nitrogen or argon at room temperature. Thermal decomposition occurs at 200 °C. Dissolution occurs in THF, in which it is trimeric-tetrameric at the boiling point,and in 1,2-dimethoxyethane, but it is insoluble in less polar solvents. It is considered to have a polymeric solid state structure with at least four coordination for ytterbium. HNMR spectrum (C4D8O) 7.12(br), 4H, H3, 5 7.38 (br), 2H, H4 7.71 (br), - 4H, H2,6 downfield from Me Si. Electronic spectrum (300-1000nm, THF) 325 (e = 900), 543 (500)nm. On brief exposure to air, an ytterbium(III) absorption at 978 nm appears. The IR (Nujol mull) 2045 and 2020 (vw) [v,c 481 (s), 1439 (s). 1023 (s), 750 (vs), and 687(vs)cm . 

Marks and R. D. Ernst, Scandium, Yttrium and the Lanthanides and Actinides, in Comprehensive Organometallic Chemistry, Vol. 3, G. Wilkinson, F. G. A. Stone, and E. W. Abel, (eds), Pergamon, Oxford 1982, Chapter 21. 

Forsberg and T. Moeller, Oi nomelallic Compounds, in Gmelin Handbook of Inorganic Chemistry, RE Main Volume D6, 1983 pp. 137-302. 

Schumann and W. Genthe, Organometallic Compounds of the Rare Earths, in Handbook of the Physics and Chemistry of the Rare Earths, K. A. Gschneidner and I. Eyring, (eds.), Elsevier, Amsterdam, 1984, Chapter S3. 

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BIS(PHENYLETHYNYL)YTTERBIUM(II) FROM YTTERBIUM METAL AND BIS(PHENYLETHYNYL)MERCURY ... 

Details of the redox transmetalation synthesis of bis(phenylethynyl)-ytterbium(II) are presented here. This diorganoytterbium(II) compound has a rich reaction chemistry, which is currently being developed. The compound is highly air and moisture sensitive and must be handled under purified nitrogen or argon. Bis(phenylethynyl)ytterbium(II) can be stored indefinitely in an inert atmosphere at room temperature. ... 

YO3C43HS3, Yttriuni, triis(2,6-di-tert-butylphcnoxo)-, 27 167 YO3C45H69, Yttrium, tris(2,6-di-tert-butyl-4-methylphenoxoK 27 167 YjCljSigCggHgg, Yttrium, tetrakis[ii -l,3-bis(trimethylsilyl)cyclopentadienyl]di- -chloro-di-, 27 171 YbC,gH,o, Ytterbium(IIX bis(phenylethynyl)-, 27 143 YbCl2Li02Si4C3oH5g, Ytterbium, bis[ -... 

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