Portal de Periódicos da CAPES

Synthesis and structure of triphenylmethyl derivatives of ytterbium [Yb(THF)6]2+[Ph3C]2− and [(THF)4Yb(μ-Cl)2Yb(THF)4]2+ [Ph3Cl]2−

1995; Elsevier BV; Volume: 485; Issue: 1-2 Linguagem: Inglês

10.1016/0022-328x(95)91121-y

1872-8561

Л. Н. Бочкарев, Natalia E. Molosnova, L.N. Zakharov, Georgy K. Fukin, A.I. Yanovsky, Yuri T. Struckhov,

Inorganic Fluorides and Related Compounds

Ionic triphenylmethyl complexes of ytterbium [Yb(THF)6]2+[Ph3C]2− (1) and [(THF)4Yb(μ-Cl)2Yb(THF)4]2+[Ph3C]2− (2) have been synthesized by the reaction of Ph3CCl with ytterbium in THF. Complex1 has also been prepared by the reaction of ytterbium with a dimer of triphenylmethyl radicals in THF. It was found that this reaction was catalyzed by ytterbium dihalides. According to X-ray diffraction result the crystal structures of1 and2 are composed of isolated ions. The [Yb(THF)6]2+ cation has an ideal octahedral coordination of the central Yb atom with the YbO distance of 2.390(7)Å. The [(THF)4Yb(μ-Cl)2Yb(THF)4]2+ cation is a centrosymmetrical dimer in which each Yb atom is bonded to four oxygen atoms of THF molecules and two (THF)4Yb units are linked via two symmetrical μ-Cl bridges, both YbCl distances being 2.715(4)Å. The [Ph3C]− anion in1 and2 has a propeller-type geometry with the planar environment of the central carbon atom (within 0.02Åin1 and 0.006Åin2). The Ph rings are rotated out of the average CC3 plane of the central fragment of [Ph3C]− anion by 28.2° in1 and by 26.6, 31.9, 33.7° in2.