Isolation and x-ray crystal structures of {Li2[μ2-As(SiMe3)2][μ3-As(SiMe3)2](THF)}2and [(Me3Si)2AsLi(THF)2]2


Journal Article

The lithium arsenides {Li2[p2-As(SiMe3)2] [p3-As(SiMe3)2](THF)}2 (I) (THF = tetrahydrofuran) and [(Me3Si)2AsLi(THF)2]2 (II) were isolated and their solid-state structures determined by X-ray methods. Compound I crystallizes in the monoclinic system, space group P2,/c, with a = 10.147(1)A, b = 19.665(2)A, c = 16.768(2) A, p = 107.78(1)° and Z = 2. The core structure consists of an [LiAs]4 ladder-like framework with four antiparallel adjacent As-Li rungs. The two lithium atoms of the central ring each bridge three arsenic centers while the two lithium atoms belonging solely to the outer rings each span two arsenic atoms and are coordinated to one THF molecule. Monoclinic crystals of compound II belong to space group C2/c, with a = 17.877(4) A, b = 14.077(3) A, c = 19.006(4) A, p = 109.16(2)“ and Z = 4. The structure consists of a centrosymmetric dimer containing a four-membered As-Li-As-Li ring wherein each lithium atom is coordinated to two molecules of THF. © 1995, Taylor & Francis Group, LLC. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Jones, LJ; McPhail, AT; Wells, RL

Published Date

  • February 1, 1995

Published In

Volume / Issue

  • 34 / 2

Start / End Page

  • 119 - 127

Electronic International Standard Serial Number (EISSN)

  • 1029-0389

International Standard Serial Number (ISSN)

  • 0095-8972

Digital Object Identifier (DOI)

  • 10.1080/00958979508055391

Citation Source

  • Scopus